Thermal expansion of organic superconductor k-(D4-BEDT-TTF)2Cu{N(CN)2}Br. Isotopic effect

A. V. Dolbin; M. V. Khlistuck; V. B. Eselson; V. G. Gavrilko; N. A. Vinnikov; R. M. Basnukaeva; V. A. Konstantinov; Y. Nakazawa

doi:10.1063/1.5012790

arXiv · 1708.04041

Thermal expansion of organic superconductor k-(D4-BEDT-TTF)2Cu{N(CN)2}Br. Isotopic effect

A. V. Dolbin·M. V. Khlistuck·V. B. Eselson·V. G. Gavrilko·N. A. Vinnikov·R. M. Basnukaeva·V. A. Konstantinov·Y. Nakazawa

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Abstract

Linear thermal expansion coefficient (LTEC) of single crystal k-(D4-BEDT-TTF)2Cu[N(CN)2]Br was studied across the crystal layers in the temperature range 2-290 K using the method of precise capacitive dilatometry. Below Tc = 11,6 K the LTEC of the sample had a small negative value, which is apparently due to the transition from the paramagnetic metal in the superconducting state. There was a bend of temperature dependence of the LTEC, which shows broad peak around 40 K and can be attributed to the elastic lattice anomaly around the end-point of Mott boundary. A sharp jump in the LTEC values and hysteresis was observed in the area of Tg ~ 75-77 K, what is likely explained by the transition in a glass-like state. The isotope effect in the thermal expansion is discusses, which manifested itself in a shift of the phase transitions in comparison with fully deuterated BEDT-TTF sample.

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A. V. Dolbin, M. V. Khlistuck, V. B. Eselson, V. G. Gavrilko, N. A. Vinnikov, R. M. Basnukaeva, V. A. Konstantinov, Y. Nakazawa. 2017-08-14. Thermal expansion of organic superconductor k-(D4-BEDT-TTF)2Cu{N(CN)2}Br. Isotopic effect. https://doi.org/10.1063/1.5012790

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