首页> 外文期刊>Molecular Crystals and Liquid Crystals Science and Technology, Section A. Molecular Crystals and Liquid Crystals >Mysterious Thermal Properties of pi-(EDO-S,S-DMEDT-TTF)_2(AuBr_2)_(1+y) and pi-(P-S,S-DMEDT-TTF)_2(AuBr_2)_(1+y)(y approx 0.75)
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Mysterious Thermal Properties of pi-(EDO-S,S-DMEDT-TTF)_2(AuBr_2)_(1+y) and pi-(P-S,S-DMEDT-TTF)_2(AuBr_2)_(1+y)(y approx 0.75)

机译:pi-(EDO-S,S-DMEDT-TTF)_2(AuBr_2)_(1 + y)和pi-(PS,S-DMEDT-TTF)_2(AuBr_2)_(1 + y)( y约0.75)

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摘要

Thermal properties of pi-(EDO-S,S-DMEDT-TTF)_2(AuBr_2)_(1+y) and its nitrogen analogue pi-(P-S,S-DMEDT-TTF)_2(AuBr_2)_(1+y) systems were studied in the temperature region from 0.1K to 70Kwhere the systems exhibit interesting features such as large negative magnetoresistance with large hysteresis and spin fluctuation. We found that in both systems, the component of the specific heat that depends linearly on temperature (gamma T term) is large. The magnitude of gamma is several times larger than that of conventional organic metals. Below 10K, pi-(P-S, S-DMEDT-TTF)_2 (AuBr-2)_(1+y) has the excess specific heat DELTA C in addition to the lattice and electronic specific heat. Its excess entropy corresponds to 70 percent of two level system with Avogadro's number. Further investigation of this excess specific heat may provide us clues to clarify the origin of the spin fluctuation and the negative magnetoresistance.
机译:pi-(EDO-S,S-DMEDT-TTF)_2(AuBr_2)_(1 + y)及其氮类似物pi-(PS,S-DMEDT-TTF)_2(AuBr_2)_(1 + y)的热性质)系统在0.1K到70K的温度范围内进行了研究,这些系统表现出令人感兴趣的功能,例如较大的负磁阻,较大的磁滞和自旋波动。我们发现,在这两个系统中,与温度线性相关的比热(γT项)分量很大。 γ的大小是传统有机金属的几倍。在10K以下,pi-(P-S,S-DMEDT-TTF)_2(AuBr-2)_(1 + y)除了晶格和电子比热外,还具有过量的比热DELTAC。它的过量熵相当于具有Avogadro数的二级系统的70%。进一步研究这种多余的比热可能为我们提供线索,以阐明自旋波动和负磁阻的起源。

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