Extension of the λ curve of <sup>4</sup>He into the region of the metastable state of liquid helium

V.P. Skripov
Institute of Thermal Physics, Ural Branch of the Russian Academy of Sciences, Pervomaiskaya str. 91, Ekaterinburg, 620219, Russian Federation

A possible extension (λ^’) of the λ curve of liquid helium beyond the T, p boiling line, i.e., into the region of a metastable liquid state, is examined. The relation between the slope of the λ curve dp/dT_λ and the sign of the thermal expansion coefficient of liquid helium a_p is discussed. Experimental data for a_p are analyzed using thermodynamic equations to reveal that the derivative dp/dT_λ changes sign in the metastable region. As a result, the shape of the λ^’ extension becomes similar to that of the pressure-shifted Bose-condensation line of an ideal ⁴He gas. The position of the λ^’ curve is not entirely arbitrary due to the spinodal nature of stretched liquid helium.

PACS: 67.40.−w, 67.40.Kh, 67.90.+z (all)
DOI: 10.1070/PU2000v043n05ABEH000690
URL: https://ufn.ru/en/articles/2000/5/e/
Web of Science

000165080500005
Citation: Skripov V P "Extension of the λ curve of ⁴He into the region of the metastable state of liquid helium" Phys. Usp. 43 515–519 (2000)

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Оригинал: Скрипов В П «Продолжение λ-кривой ⁴Не в область метастабильного состояния жидкого гелия» УФН 170 559–563 (2000); DOI: 10.3367/UFNr.0170.200005f.0559

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Extension of the λ curve of 4He into the region of the metastable state of liquid helium

Extension of the λ curve of ⁴He into the region of the metastable state of liquid helium