Characterization of low-temperature electronic states of the organic conductors alpha -(BEDT-TTF)2MHg(SCN)4 (M=K, Rb, and NH4) by specific-heat measurements.
Characterization of low-temperature electronic states of the organic conductors alpha -(BEDT-TTF)2MHg(SCN)4 (M=K, Rb, and NH4) by specific-heat measurements.
复制标题
通过比热测量表征有机导体 α -(BEDT-TTF)2MHg(SCN)4（M=K、Rb 和 NH4）的低温电子态。
DOI：
10.1103/physrevb.52.12890
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Kanoda
中科院分区：
文献类型：
--
作者：
Nakazawa;Kawamoto;Kanoda
测量了有机导体α-（BEDT-TTF）2 MHg（SCN）4（M= K，Rb，NH 4）在温度低至0.2 5 K，磁场高至8 T时的低温比热。电子比热系数γ对M= K和Rb盐均为7.0± 0.6mJ/molK 2，对M= NH 4盐为25-26 mJ/molK 2。M= K和Rb时的γ值小于M= NH 4时的γ值，表明前两种盐低温相的电子态密度被抑制到高温相的35%左右。该比热曲线在高达8 T时保持不变。超导NH 4盐在相变温度附近有一个很宽的比热峰，反映了超导的二维性质。
The low-temperature specific heat of the organic conductors α-(BEDT-TTF) 2 MHg (SCN) 4 (M= K, Rb, and NH 4) has been measured at temperatures down to 0.25 K and under magnetic field up to 8 T. The electronic specific-heat coefficient γ is estimated at 7.0±0.6 mJ/mol K 2 for both M= K and Rb salts and 25–26 mJ/mol K 2 for M= NH 4 salt. The smaller γ values for M= K and Rb than that for M= NH 4 imply that the electron density of states of the low-temperature phase of the former two salts is suppressed down to about 35% of that of the high-temperature phase. This profile of specific heat remains unchanged up to 8 T. The superconducting NH 4 salt shows a very broad specific-heat peak around the transition temperature, reflecting a strong two-dimensional nature of the superconductivity.