TY - JOUR
T1 - Magneto-thermopower in the weak ferromagnetic oxide CaRu0.8Sc0.2O3
T2 - An experimental test for the Kelvin formula in a magnetic material
AU - Yamamoto, Takafumi D.
AU - Taniguchi, Hiroki
AU - Yasui, Yukio
AU - Iguchi, Satoshi
AU - Sasaki, Takahiko
AU - Terasaki, Ichiro
N1 - Funding Information:
Acknowledgment This work was partially supported by Grants-in-Aid for Scientific Research, MEXT, Japan (Nos. 25610091 and 26247060). One of the authors (T. D. Y.) was supported by the Program for Leading Graduate Schools “Integrative Graduate Education and Research in Green Natural Sciences”, MEXT, Japan. A part of this work was performed under the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University (Proposal Nos. 15K0021 and 14K0024).
Publisher Copyright:
©2017 The Physical Society of Japan.
PY - 2017/10/15
Y1 - 2017/10/15
N2 - 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 QðH; TÞ ¼ QðH; TÞ Qð0; TÞ is roughly proportional to the magneto-entropy SðH; TÞ ¼ SðH; TÞ Sð0; TÞ. 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.
AB - 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 QðH; TÞ ¼ QðH; TÞ Qð0; TÞ is roughly proportional to the magneto-entropy SðH; TÞ ¼ SðH; TÞ Sð0; TÞ. 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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U2 - 10.7566/JPSJ.86.104707
DO - 10.7566/JPSJ.86.104707
M3 - Article
AN - SCOPUS:85030999409
SN - 0031-9015
VL - 86
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 10
M1 - 104707
ER -