Conferences and symposia. 70th anniversary of the E.K. Zavoisky physical-technical institute, Kazan scientific center of the Russian academy of sciences

Quantum phase transitions in spiral magnets without inversion center

 a, b,  a, c,  d,  c,  a, c,  c,  a,  a, c
a Prokhorov General Physics Institute of the Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119942, Russian Federation
b National Research University Higher School of Economics, ul. Myasnitskaya 20, Moscow, 101000, Russian Federation
c Moscow Institute of Physics and Technology (State University), Institutskii per. 9, Dolgoprudnyi, Moscow Region, 141700, Russian Federation
d The National Research Center "Kurchatov Institute", Konstantinov Petersburg Nuclear Physics Institute, Orlova Roshcha, Gatchina, Leningradskaya Region, 188300, Russian Federation

It is shown that the T − x magnetic phase diagram of Mn1-xFexSi solid solutions exhibits two quantum critical points: x* ~ 0.11, which corresponds to the disappearance of long-range spiral magnetic order, and xc ~ 0.24, which marks the suppression of the phase with short-range magnetic order It is established that the macroscopic reason for observed complicated quantum critical behavior is the evolution of the Fermi-surface driven by an increase of the iron concentration.

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Keywords: spiral magnets, Mn1-xFexSi, quantum criticality, magnetic phase diagram, electron paramagnetic resonance, Hall effect, strongly correlated electron systems
PACS: 75.10.Kt, 75.30.Kz, 75.47.−m, 75.50.Bb, 76.30.Fc (all)
DOI: 10.3367/UFNe.2016.02.037767
Citation: Demishev S V, Glushkov V V, Grigoriev S V, Gil’manov M I, Lobanova I I, Samarin A N, Semeno A V, Sluchanko N E "Quantum phase transitions in spiral magnets without inversion center" Phys. Usp. 59 559–563 (2016)
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Received: 3rd, March 2016, 4th, February 2016

Оригинал: Демишев С В, Глушков В В, Григорьев С В, Гильманов М И, Лобанова И И, Самарин А Н, Семено А В, Случанко Н Е «Квантовые фазовые переходы в спиральных магнетиках без центра инверсии» УФН 186 628–632 (2016); DOI: 10.3367/UFNr.2016.02.037767

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