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arXiv 1708.07992cond-mat.str-el
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弱铁磁氧化物CaRu0 .8Sc0.2O3中的磁热电势:磁性材料中开尔文公式的实验检验

Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu0.8Sc0.2O3: An Experimental Test for the Kelvin Formula in a Magnetic Material

Takafumi D. Yamamoto, Hiroki Taniguchi, Yukio Yasui, Satoshi Iguchi, Takahiko Sasaki, Ichiro Terasaki

摘要:

我们测量了弱铁磁氧化物CaRu_(0.8)Sc_(0.2)O_3在80 K以下140 kOe的外磁场中的电阻率、热电势和比热。我们观察到在铁磁转变温度30 K附近,热电势Q被磁场显著抑制,并进一步发现磁热电势ΔQ(H,T)= Q(H,T)- Q(0,T)与磁熵ΔS(H,T)= S(H,T)-S(0,T)大致成正比。我们用Kelvin公式讨论了这两个量之间的关系,发现观测到的ΔQ值与Kelvin公式的预期值在数量上是一致的,并讨论了其可能的物理意义。

英文摘要:

We have measured the resistivity, the thermopower, and the specific heat of the weak ferromagnetic oxide CaRu0.8Sc0.2O3 in external magnetic fields up to 140 kOe below 80 K. We have observed that the thermopower Q is significantly suppressed by magnetic fields at around the ferromagnetic transition temperature of 30 K, and have further found that the magneto-thermopower ΔQ(H, T) = Q(H, T) - Q(0, T) is roughly proportional to the magneto-entropy ΔS(H, T) = S(H, T)-S(0, T).We discuss this relationship between the two quantities in terms of the Kelvin formula, and find that the observed ΔQ is quantitatively consistent with the values expected from the Kelvin formula, a possible physical meaning of which is discussed.

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