Thermal expansion of organic superconductor α-(BEDT-TTF)₂ NH₄Hg(SCN)₄

• Дата: 2019
• Автори: Dolbin, A.V., Khlistuck, M.V., Eselson, V.B., Gavrilko, V.G., Vinnikov, N.A., Basnukaeva, R.M., Konstantinov, V.A., Luchinskii, K.R., Nakazawa, Y.
• Формат: Стаття
• Мова: Russian
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2019
• Назва видання: Физика низких температур
• Теми: Короткі повідомлення
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/175423
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Thermal expansion of organic superconductor α-(BEDT-TTF)₂ NH₄Hg(SCN)₄ / A.V. Dolbin, M.V. Khlistuck, V.B. Eselson, V.G. Gavrilko, N.A. Vinnikov, R.M. Basnukaeva, V.A. Konstantinov, K.R. Luchinskii, Y. Nakazawa // Физика низких температур. — 2019. — Т. 45, № 1. — С. 146-150. — Бібліогр.: 24 назв. — рос.

The temperature dependence of the linear thermal expansion coefficients (LTEC) of a single crystal of α-(BEDT-TTF)₂NH₄Hg(SCN)₄ where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene was studied by the method of precision capacitive dilatometry in the temperature range 2–250 K along the crystallographic direction b (perpendicular to the crystal layers). Negative values of LTEC were found below 4 K. Probably it is due to charge fluctuations as the temperature approaches the temperature of transition to the superconducting state Tc. It has been suggested that the bends on temperature dependence of LTEC observed in the temperature range 25–45 K are related to order-disorder arrangement of NH₄⁺ ions. Weak maximum of the LTEC, detected at a temperature of about 200–220 K, can be caused by the processes of charge redistribution and the associated intermolecular interaction fluctuations.