自旋密度波化合物（TMTTF）2 Br的平衡低温Heat Capacity：磁场的影响
Equilibrium Low Temperature Heat Capacity of the Spin Density Wave compound (TMTTF)2 Br: effect of a Magnetic Field
摘要：
研究了磁场（B）对准一维有机化合物（TMTTF）2Br的超低温平衡热容（ceq）的影响，该化合物具有公度自旋密度波（SDW）基态.低于1 K，ceq是由一个肖特基样的贡献，非常敏感的实验时间尺度，一个属性，我们以前在许多DW化合物测量。在施加的场（在0.2- 7 T的范围内）下，平衡动力学以及因此从时间常数提取的ceq极大地增加。对于B = 2-3 T，ceq变化类似于B2，与磁塞曼耦合一致。与其他电荷/自旋密度波（DW）化合物共同的另一个具体性质是在ceq中出现亚稳分支，其在非常低的温度下由超过临界值的场引起。这些影响进行了讨论内的推广SDWs在一个磁场的Larkin-Ovchinnikov本地模型的强钉扎。与实验相比，该模型的局限性指出。
英文摘要：
We have investigated the effect of the magnetic field (B) on the very low-temperature equilibrium heat capacity ceq of the quasi-1 D organic compound (TMTTF)2Br, characterized by a commensurate Spin Density Wave (SDW) ground state. Below 1K, ceq is dominated by a Schottky-like contribution, very sensitive to the experimental time scale, a property that we have previously measured in numerous DW compounds. Under applied field (in the range 0.2- 7 T), the equilibrium dynamics, and hence ceq extracted from the time constant, increases enormously. For B = 2-3 T, ceq varies like B2, in agreement with a magnetic Zeeman coupling. Another specific property, common to other Charge/Spin density wave (DW) compounds, is the occurrence of metastable branches in ceq, induced at very low temperature by the field exceeding a critical value. These effects are discussed within a generalization to SDWs in a magnetic field of the available Larkin-Ovchinnikov local model of strong pinning. A limitation of the model when compared to experiments is pointed out.
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