RSS feeds
РусскийEnglish
Issue 4, 2024
Volume year page
Issues Authors PACS Subscription For authors

Issues

 / 

2001

 / 

June

←  →

Reviews of topical problems


Inhomogeneous charge distributions and phase separation in manganites

 a,  b
a Kapitza Institute of Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russian Federation
b Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russian Federation

Mechanisms of electron phase separation in manganite-type oxide materials are analyzed using a simple Kondo-lattice model with intersite Coulomb repulsion between electrons. This model predicts the instability of magnetic (or charge) homogeneous ordering toward the formation of droplet structures (magnetic polarons) for a wide parameter range in the phase diagram. Various types of magnetic polarons are examined. The transport properties and noise spectrum of phase-separated materials are also discussed.

Fulltext pdf (395 KB)
Fulltext is also available at DOI: 10.1070/PU2001v044n06ABEH000917
PACS: 64.75.+g, 71.27.+a, 72.10.−d, 75.30.Vn (all)
DOI: 10.1070/PU2001v044n06ABEH000917
URL: https://ufn.ru/en/articles/2001/6/a/
000173336200001
Citation: Kagan M Yu, Kugel’ K I "Inhomogeneous charge distributions and phase separation in manganites" Phys. Usp. 44 553–570 (2001)
BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks

Оригинал: Каган М Ю, Кугель К И «Неоднородные зарядовые состояния и фазовое расслоение в манганитах» УФН 171 577–596 (2001); DOI: 10.3367/UFNr.0171.200106a.0577

References (66) Cited by (221) ↓ Similar articles (20)

  1. Aplesnin S, Kharkov A, Sitnikov M Eur. Phys. J. Plus 139 (3) (2024)
  2. Gavrichkov V A, Polukeev S I Physica B: Condensed Matter 673 415457 (2024)
  3. Albertini R, Macis S et al Condensed Matter 8 57 (2023)
  4. Okunev V D, Szymczak H 133 (8) (2023)
  5. Khannanov B Kh, Golovenchits E I et al Ferroelectrics 590 135 (2022)
  6. Udalov O G, Beloborodov I S Phys. Rev. B 106 (10) (2022)
  7. Khannanov B Kh, Golovenchits E I, Sanina V A Ferroelectrics 590 151 (2022)
  8. Gudin S A Phys. Solid State 64 6 (2022)
  9. Aplesnin S S, Udod L V et al Journal Of Magnetism And Magnetic Materials 559 169530 (2022)
  10. Romanova O B, Aplesnin S S et al Appl. Phys. A 128 (2) (2022)
  11. Khannanov B Kh, Golovenchits E I, Sanina V A Jetp Lett. 115 231 (2022)
  12. Gamzatov A G, Gudin S A et al Jetp Lett. 115 190 (2022)
  13. Kugel K I, Rakhmanov A L, Sboychakov A O Phys. Metals Metallogr. 123 674 (2022)
  14. Romanova O B, Aplesnin S S et al J. Exp. Theor. Phys. 132 831 (2021)
  15. Song G, Zhang Yu et al Nanomaterials 11 1109 (2021)
  16. Aplesnin S S, Masyugin A N et al Phys. Solid State 63 242 (2021)
  17. Kretinin V V, Begisheva O B et al IOP Conf. Ser.: Mater. Sci. Eng. 1181 012004 (2021)
  18. Sanina V, Khannanov B, Golovenchits E Nanomaterials 11 1664 (2021)
  19. Okunev V D, Samoilenko Z A et al Phys. Solid State 63 603 (2021)
  20. Kagan M Yu, Mazur E A J. Exp. Theor. Phys. 132 596 (2021)
  21. Pankratova A K, Igoshev P A, Irkhin V Yu J. Phys.: Condens. Matter 33 375802 (2021)
  22. Kagan M Yu, Kugel K I, Rakhmanov A L Physics Reports 916 1 (2021)
  23. Romanova O B, Kretinin V V et al Phys. Solid State 63 897 (2021)
  24. Gudin S A, Solin N I Phys. Solid State 62 756 (2020)
  25. Khannanov B Kh, Golovenchits E I, Sanina V A Phys. Solid State 62 308 (2020)
  26. Udalov O G, Beloborodov I S Phys. Rev. B 101 (17) (2020)
  27. Rakhmanov A L, Kugel K I, Sboychakov A O J Supercond Nov Magn 33 2405 (2020)
  28. Chiang Yu N, Dzyuba M O 46 559 (2020)
  29. Polozov V I, Maklakov S S et al Phys. Rev. B 101 (21) (2020)
  30. Romanova O B, Aplesnin S S et al J Mater Sci: Mater Electron 31 7946 (2020)
  31. Wei Z, Pashchenko A V et al Phys. Chem. Chem. Phys. 22 11817 (2020)
  32. Gudin S A, Solin N I J. Exp. Theor. Phys. 130 543 (2020)
  33. Kovaleva N N, Kusmartsev F V et al Sci Rep 10 (1) (2020)
  34. Khannanov B Kh, Golovenchits E I, Sanina V A Phys. Solid State 62 660 (2020)
  35. Golovenchits E I, Khannanov B Kh, Sanina V A Jetp Lett. 111 709 (2020)
  36. Bill A, Hizhnyakov V et al Condensed Matter 5 65 (2020)
  37. Khannanov B Kh, Zalessky V G et al J. Exp. Theor. Phys. 130 439 (2020)
  38. Swain A, Anil K P S, Gorige V Journal Of Magnetism And Magnetic Materials 485 358 (2019)
  39. Sanina V A, Khannanov B Kh et al Phys. Solid State 61 370 (2019)
  40. Udalov O G, Beloborodov I S J. Phys.: Condens. Matter 31 415801 (2019)
  41. Romanova O B, Aplesnin S S et al 125 (17) (2019)
  42. Udalov O G, Beloborodov I S Phys. Rev. B 100 (15) (2019)
  43. Romanova O B, Aplesnin S S et al Solid State Communications 287 72 (2019)
  44. Anisimov M A, Bogach A V et al Phys. Solid State 61 565 (2019)
  45. Dudnikov V A, Kazak N V et al J. Exp. Theor. Phys. 128 630 (2019)
  46. Liarokapis Condensed Matter 4 87 (2019)
  47. Volkova Z N, Verkhovskii S V et al Jetp Lett. 109 541 (2019)
  48. Vorob’ev S I, Getalov A L et al Jetp Lett. 110 133 (2019)
  49. Kagan M Yu, Bianconi A Condensed Matter 4 51 (2019)
  50. Mamin R F, Shaposhnikova T S, Kabanov V V Phys. Rev. B 97 (9) (2018)
  51. Gudin S A, Solin N I, Gapontseva N N Phys. Solid State 60 1078 (2018)
  52. Sanina V A, Khannanov B Kh et al Phys. Solid State 60 537 (2018)
  53. Groshev A G, Arzhnikov A K J. Phys.: Condens. Matter 30 185801 (2018)
  54. Sanina V A, Khannanov B Kh et al Phys. Solid State 60 2532 (2018)
  55. Mchalwat M, Ulrichs H et al J. Phys.: Condens. Matter 30 045701 (2018)
  56. Aplesnin S S, Sitnikov M N, Zhivul’ko A M Phys. Solid State 60 673 (2018)
  57. Aplesnin S S, Romanova O B et al Semicond. Sci. Technol. 33 085006 (2018)
  58. Bykov A A, Zobkalo I A et al J. Exp. Theor. Phys. 124 786 (2017)
  59. Turlapov A V, Yu K M J. Phys.: Condens. Matter 29 383004 (2017)
  60. Khannanov B Kh, Sanina V A et al Journal Of Magnetism And Magnetic Materials 421 326 (2017)
  61. Sanina V A, Khannanov B Kh, Golovenchits E I Phys. Solid State 59 1952 (2017)
  62. Andrievskii D S, Vorob’ev S I et al Jetp Lett. 106 295 (2017)
  63. Anahory Y, Embon L et al Nat Commun 7 (1) (2016)
  64. Khannanov B Kh, Sanina V A et al Jetp Lett. 103 248 (2016)
  65. Solin N I, Romashev L N et al Tech. Phys. 61 233 (2016)
  66. Vorob’ev S I, Andrievskii D S et al J. Exp. Theor. Phys. 123 1017 (2016)
  67. Krivoruchko V N, Marchenko M A Journal Of Magnetism And Magnetic Materials 412 30 (2016)
  68. Dovgii V T, Linnik A I et al Journal Of Magnetism And Magnetic Materials 408 89 (2016)
  69. Solin N I Journal Of Magnetism And Magnetic Materials 401 677 (2016)
  70. Demishev S V, Samarin A N et al Jetp Lett. 104 116 (2016)
  71. Yermakov A Y, Uimin M A et al Phys. Solid State 57 296 (2015)
  72. Gudin S A, Kurkin M I et al J. Exp. Theor. Phys. 121 878 (2015)
  73. Aplesnin S S, Romanova O B, Yanushkevich K I Phys. Status Solidi B 252 1792 (2015)
  74. Mamin R F, Strle J et al 107 (19) (2015)
  75. Zaidi N, Mnefgui S et al Journal Of Rare Earths 33 168 (2015)
  76. Dovgii V T, Linnik A I et al Phys. Solid State 57 2404 (2015)
  77. Sanina V A, Golovenchits E I et al Jetp Lett. 100 407 (2014)
  78. Poccia N, Chorro M et al 104 (22) (2014)
  79. Khannanov B Kh, Golovenchits E I, Sanina V A J. Phys.: Conf. Ser. 572 012046 (2014)
  80. Krivoruchko V N 40 586 (2014)
  81. Zobkalo I A, Gavrilov S V et al Phys. Solid State 56 51 (2014)
  82. Andreeva N V, Sanina V A et al Lecture Notes In Computer Science Vol. Internet of Things, Smart Spaces, and Next Generation Networks and SystemsLow Temperature Ferroelectric and Magnetic Properties of Doped Multiferroic Tb0.95Bi0.05MnO38638 Chapter 39 (2014) p. 444
  83. Aplesnin S S, Sitnikov M N Jetp Lett. 100 95 (2014)
  84. Poccia N, Lankhorst M, Golubov A A Physica C: Superconductivity And Its Applications 503 82 (2014)
  85. Mamin R F, Kabanov V V New J. Phys. 16 073011 (2014)
  86. Pashchenko A V, Pashchenko V P et al 40 717 (2014)
  87. Kagan M Yu, Kugel K I et al Jetp Lett. 100 187 (2014)
  88. Solin N I, Naumov S V J. Exp. Theor. Phys. 116 145 (2013)
  89. Kagan M Yu Lecture Notes In Physics Vol. Modern trends in Superconductivity and SuperfluidityNanoscale Phase Separation in Complex Magnetic Oxides874 Chapter 15 (2013) p. 463
  90. Okunev V D, Samoilenko Z A et al 113 (16) (2013)
  91. Kagan M Yu Lecture Notes In Physics Vol. Modern trends in Superconductivity and SuperfluiditySuperconductivity in the Low-Density Electron Systems with Repulsion874 Chapter 9 (2013) p. 291
  92. Sanina V A, Golovenchits E I et al J. Phys.: Condens. Matter 25 336001 (2013)
  93. Solin N I, Kazantsev V A Phys. Solid State 55 1846 (2013)
  94. Kurkin M I, Neifeld E A et al J. Exp. Theor. Phys. 116 823 (2013)
  95. Dovgii V T Funct.Mater. 20 424 (2013)
  96. Greben’kova Yu E, Sokolov A E et al Jetp Lett. 98 460 (2013)
  97. Neifeld E A, Ugryumova N A et al Phys. Solid State 55 2345 (2013)
  98. Gabovich A M, Voitenko A I 39 232 (2013)
  99. Vorob’ev S I, Getalov A L et al Phys. Solid State 55 466 (2013)
  100. Sboychakov A O, Rozhkov A V et al Phys. Rev. B 88 (19) (2013)
  101. Kagan M Y, Efremov D V et al J Supercond Nov Magn 26 2809 (2013)
  102. Solin N I, Korolyov A V et al Journal Of Magnetism And Magnetic Materials 334 74 (2013)
  103. Pashchenko A V, Pashchenko V P et al Phys. Solid State 54 767 (2012)
  104. Golovenchits E I, Sanina V A, Zalesskii V G Jetp Lett. 95 386 (2012)
  105. Czart W R, Grzybowski P R et al Acta Phys. Pol. A 121 828 (2012)
  106. Sanina V A, Golovenchits E I, Zalesskii V G J. Phys.: Condens. Matter 24 346002 (2012)
  107. Kovaleva N N, Kugel K I et al Sci Rep 2 (1) (2012)
  108. Solin N I J. Exp. Theor. Phys. 114 96 (2012)
  109. Mamin R F, Bizyaev D A, Bukharaev A A Bull. Russ. Acad. Sci. Phys. 75 5 (2011)
  110. Okunev V D, Samoilenko Z A et al J. Phys.: Condens. Matter 23 415702 (2011)
  111. Sanina V A, Golovenchits E I et al J. Phys.: Condens. Matter 23 456003 (2011)
  112. Bebenin N G Phys. Metals Metallogr. 111 236 (2011)
  113. Dovgii V T, Linnik A I et al Inorg Mater 47 1253 (2011)
  114. Sarychev A K, Boyarintsev S O et al Phys. Rev. Lett. 107 (26) (2011)
  115. Meilikhov E Z, Farzetdinova R M Physics Letters A 375 3731 (2011)
  116. Gavrichkov V A, Ovchinnikov S G et al J. Exp. Theor. Phys. 112 860 (2011)
  117. Khokhlov V A, Prokhorov A Yu et al Tech. Phys. 56 1475 (2011)
  118. Okunev V D, Samoilenko Z A et al J. Phys.: Condens. Matter 22 296001 (2010)
  119. Bebenin N G, Zainullina R I et al Phys. Metals Metallogr. 110 442 (2010)
  120. Kalinov A V, Gorbenko O Yu et al SSP 168-169 465 (2010)
  121. Klabukov A A, Patrin G S et al J. Commun. Technol. Electron. 55 352 (2010)
  122. Solin N I Jetp Lett. 91 675 (2010)
  123. Czart W R, Grzybowski P R, Robaszkiewicz S Acta Phys. Pol. A 118 369 (2010)
  124. Solin N I, Naumov S V et al Phys. Solid State 52 289 (2010)
  125. Kalinov A V, Gorbenko O Yu et al Phys. Rev. B 81 (13) (2010)
  126. Golovenchits E I, Sanina V A et al 36 522 (2010)
  127. Gavrichkov V A, Ovchinnikov S G et al J. Phys.: Conf. Ser. 200 012046 (2010)
  128. Bebenin N G, Zainullina R I et al Phys. Metals Metallogr. 108 232 (2009)
  129. Ivanova N B, Ovchinnikov S G et al Uspekhi Fizicheskikh Nauk 179 837 (2009)
  130. Kabanov V V, Mamin R F, Shaposhnikova T S J. Exp. Theor. Phys. 108 286 (2009)
  131. Pashchenko A V, Shemyakov A A et al Phys. Solid State 51 1193 (2009)
  132. Ovchinnikov S G, Korshunov M M, Shneyder E I J. Exp. Theor. Phys. 109 775 (2009)
  133. Okunev V D, Samoilenko Z A et al Physics Letters A 373 894 (2009)
  134. BUZNIKOV N A, IAKUBOV I T et al Int. J. Mod. Phys. B 23 4216 (2009)
  135. Mamin R F, Bdikin I K, Kholkin A L 94 (22) (2009)
  136. Sboychakov A O, Kugel K I et al Phys. Rev. B 80 (2) (2009)
  137. Abdulvagidov Sh B, Gamzatov A G et al J. Exp. Theor. Phys. 109 989 (2009)
  138. Kugel K I, Sboychakov A O, Khomskii D I J Supercond Nov Magn 22 147 (2009)
  139. Orlov Yu S, Ovchinnikov S G J. Exp. Theor. Phys. 109 322 (2009)
  140. Sanina V A, Golovenchits E I et al Phys. Rev. B 80 (22) (2009)
  141. Sboychakov A O, Rakhmanov A L et al Journal Of Magnetism And Magnetic Materials 321 706 (2009)
  142. Okunev V D, Samoilenko Z A et al Physics Letters A 373 3978 (2009)
  143. Kugel K I, Rakhmanov A L et al Supercond. Sci. Technol. 22 014007 (2009)
  144. Zakhvalinskiĭ V S, Laiho R et al Phys. Solid State 50 63 (2008)
  145. Kagan M Yu, Ogarkov S L et al J. Phys.: Condens. Matter 20 425214 (2008)
  146. Kugel K I, Rakhmanov A L et al Phys. Rev. B 78 (15) (2008)
  147. Sanina V A, Golovenchits E I, Zalesskiĭ V G Phys. Solid State 50 (5) (2008)
  148. Kugel K I, Rakhmanov A L et al Physica B: Condensed Matter 403 1353 (2008)
  149. Balagurov A M, Bobrikov I A et al J. Exp. Theor. Phys. 106 528 (2008)
  150. Mamin R F, Egami T et al Jetp Lett. 86 643 (2008)
  151. Bebenin N G, Zaĭnullina R I et al Phys. Solid State 50 691 (2008)
  152. Samoilenko Z A, Okunev V D et al Tech. Phys. Lett. 34 870 (2008)
  153. Czart W R, Robaszkiewicz S, Tobijaszewska B Acta Phys. Pol. A 114 129 (2008)
  154. Sanina V A, Golovenchits E I, Zalesskiĭ V G Phys. Solid State 50 (5) (2008)
  155. Chiang Yu N, Khirnyĭ V F et al 34 947 (2008)
  156. Kugel K I, Rakhmanov A L et al Phys. Rev. B 78 (16) (2008)
  157. Okunev V D, Isaev V A et al Tech. Phys. Lett. 34 65 (2008)
  158. Solin N I, Naumov S V et al Phys. Solid State 50 1908 (2008)
  159. Mamin R F, Egami T et al Phys. Rev. B 75 (11) (2007)
  160. Chukalkin Yu, Teplykh A, Goshchitskii B Physica Rapid Research Ltrs 1 (1) (2007)
  161. Gamzatov A G, Abdulvagidov Sh B et al Phys. Solid State 49 1769 (2007)
  162. Zinenko V I, Pavlovskiĭ M S Phys. Solid State 49 1749 (2007)
  163. Sboychakov A O, Kugel K I, Rakhmanov A L Phys. Rev. B 76 (19) (2007)
  164. Patrin G S, Polyakova K P et al Bull. Russ. Acad. Sci. Phys. 71 709 (2007)
  165. Voloshin I F, Kalinov A V, Fisher L M Bull. Russ. Acad. Sci. Phys. 71 670 (2007)
  166. Bebenin N G, Zainullina R I et al Phys. Metals Metallogr. 103 261 (2007)
  167. Gamzatov A G, Aliev A M et al Physica B: Condensed Matter 390 155 (2007)
  168. Samoilenko Z A, Okunev V D et al J. Phys.: Condens. Matter 19 196218 (2007)
  169. Kugel K I, Rakhmanov A L, Sboychakov A O Journal Of Magnetism And Magnetic Materials 310 1024 (2007)
  170. Patrin G S, Polyakova K P et al Tech. Phys. Lett. 33 330 (2007)
  171. Ogarkov S L, Kagan M Yu et al Phys. Rev. B 74 (1) (2006)
  172. Aplesnin S S, Piskunova N I J. Phys.: Condens. Matter 18 6859 (2006)
  173. Sboychakov A O, Kugel K I, Rakhmanov A L Phys. Rev. B 74 (1) (2006)
  174. Kagan M Yu, Kugel K I et al J. Phys.: Condens. Matter 18 10905 (2006)
  175. Sboychakov A, Rakhmanov A et al Journal Of Magnetism And Magnetic Materials 300 e151 (2006)
  176. Kozlenko D P, Ovsyannikov S V et al Phys. Solid State 48 1741 (2006)
  177. Golovenchits E I, Sanina V A Jetp Lett. 84 190 (2006)
  178. Atsarkin V A, Demidov V V J. Exp. Theor. Phys. 103 589 (2006)
  179. Koval’chuk G K, Gasumyants V É Phys. Solid State 48 303 (2006)
  180. Sboychakov A O, Rakhmanov A L et al Phys. Rev. B 72 (1) (2005)
  181. Babushkina N A, Chistotina E A et al J. Phys.: Condens. Matter 17 1975 (2005)
  182. Kugel K I, Rakhmanov A L et al NATO Science Series II: Mathematics, Physics And Chemistry Vol. Physics of Spin in Solids: Materials, Methods and ApplicationsSpin-Dependent Transport in Phase-Separated Manganites156 Chapter 12 (2005) p. 177
  183. Kugel K I, Rakhmanov A L, Sboychakov A O Phys. Rev. Lett. 95 (26) (2005)
  184. Golovenchits E I Phys. Solid State 47 1724 (2005)
  185. Solin N I J. Exp. Theor. Phys. 101 535 (2005)
  186. Babushkina N A, Taldenkov A N et al Journal Of Magnetism And Magnetic Materials 290-291 917 (2005)
  187. Itskevich E S, Kraidenov V F, Petrova E A 31 52 (2005)
  188. Dubinin S F Phys. Solid State 47 267 (2005)
  189. Solin N I Phys. Solid State 47 1900 (2005)
  190. Pashchenko V P Tech. Phys. 50 1497 (2005)
  191. Mostovshchikova E, Bebenin N, Loshkareva N Phys. Rev. B 70 (1) (2004)
  192. Craus M-L, Cornei N et al Ceramics International 30 447 (2004)
  193. Kugel K I, Rakhmanov A L et al J. Exp. Theor. Phys. 98 572 (2004)
  194. Babushkina N A, Chistotina E A et al Phys. Solid State 46 1884 (2004)
  195. Dunaevskii S M Phys. Solid State 46 193 (2004)
  196. Mukhin A A, Biberacher M et al Journal Of Magnetic Resonance 170 8 (2004)
  197. Kusmartsev FV Contemporary Physics 45 237 (2004)
  198. González I, Castro J et al Phys. Rev. B 69 (22) (2004)
  199. Atsarkin V A, Demidov V V, Balbashov A M Jetp Lett. 80 593 (2004)
  200. Koroleva L I, Szymczak R Journal Of Physics And Chemistry Of Solids 64 1565 (2003)
  201. Babushkina N A, Chistotina E A et al Phys. Solid State 45 508 (2003)
  202. Aksenov V L, Balagurov A M, Pomyakushin V Yu Uspekhi Fizicheskikh Nauk 173 883 (2003)
  203. Babushkina N A, Chistotina E A et al J. Phys.: Condens. Matter 15 259 (2003)
  204. Sboychakov A O, Rakhmanov A L et al J. Phys.: Condens. Matter 15 1705 (2003)
  205. Moussa F, Hennion M et al Phys. Rev. B 67 (21) (2003)
  206. Shevchenko S I, Vol E D J. Phys.: Condens. Matter 15 8455 (2003)
  207. Sboychakov A O, Rakhmanov A L et al Journal Of Magnetism And Magnetic Materials 258-259 296 (2003)
  208. Dubunin S F, Arkhipov V E et al Phys. Solid State 45 2297 (2003)
  209. Kuleev I G, Kuleev I I et al Phys. Solid State 45 1874 (2003)
  210. Itskevich E S, Kraidenov V F et al 29 30 (2003)
  211. Solin N I, Mashkautsan V V et al Jetp Lett. 77 230 (2003)
  212. Dovgij V T, Linnik A I et al 29 285 (2003)
  213. Kagan M Yu, Klaptsov A V et al J. Phys. A: Math. Gen. 36 9155 (2003)
  214. Kagan M Yu, Klaptsov A V et al Uspekhi Fizicheskikh Nauk 173 877 (2003)
  215. Abramovich A I, Koroleva L I, Michurin A V J. Exp. Theor. Phys. 95 917 (2002)
  216. Demin R, Koroleva L et al Physics Letters A 296 139 (2002)
  217. Sboychakov A O, Rakhmanov A L et al J. Exp. Theor. Phys. 95 753 (2002)
  218. Zubov É E, Dyakonov V P, Szymczak H J. Exp. Theor. Phys. 95 1044 (2002)
  219. Ivannikov D, Biberacher M et al Phys. Rev. B 65 (21) (2002)
  220. Troyanchuk I O, Mantytskaya O S et al J. Exp. Theor. Phys. 95 300 (2002)
  221. Loshkareva N N, Korolev A V et al Phys. Solid State 44 1916 (2002)
© 1918–2024 Uspekhi Fizicheskikh Nauk
Email: ufn@ufn.ru Editorial office contacts About the journal Terms and conditions