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Specific heat of (Ca_(1-x)Sr_x)_3Ru_2O_7 single crystals

机译：（Ca_（1-x）Sr_x）_3Ru_2O_7单晶的比热

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摘要

We have measured the specific heat of crystals of (Ca_(1-x)Sr_x)_3Ru_2O_7 using ac- and relaxation-time calorimetry. Special emphasis was placed on the characterization of the Neel (T_N = 56 K) and structural (T_c = 48 K) phase transitions in the pure, x = 0 material. While the latter is believed to be first order, detailed measurements under different experimental conditions suggest that all the latent heat (with L ～ 0.3R) is being captured in a broadened peak in the effective heat capacity. The specific heat has a mean-field-like step at T_N, but its magnitude (Δc_P ～ R) is too large to be associated with a conventional itinerant electron (e.g. spin-density-wave) antiferromagnetic transition, while its entropy is too small to be associated with the full ordering of localized spins. The T_N transition broadens with Sr substitution while its magnitude decreases slowly. On the other hand, the entropy change associated with the T_c transition decreases rapidly with Sr substitution, and is not observable for our x = 0.58 sample.
机译：我们已经使用交流和弛豫时间量热法测量了（Ca_（1-x）Sr_x）_3Ru_2O_7晶体的比热。特别强调了在纯x = 0的材料中Neel（T_N = 56 K）和结构（T_c = 48 K）相变的表征。虽然后者被认为是一阶的，但在不同的实验条件下进行的详细测量表明，所有潜热（L〜0.3R）都在有效热容量的较宽峰中被捕获。比热在T_N处具有类似平均场的阶跃，但其幅值（Δc_P〜R）太大，无法与常规的迭代电子（例如自旋密度波）反铁磁跃迁相关联，而其熵却太小与局部自旋的完整排序相关联。 T_N跃迁随着Sr取代而变宽，而其幅度缓慢下降。另一方面，随着Sr的替换，与T_c跃迁相关的熵变化迅速减小，并且对于我们的x = 0.58样本而言是不可观察的。

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