Anomalous Thermoelectric Response in an Orbital-Ordered Oxide Near and Far from Equilibrium

• Nishina, Yasuo

• Okazaki, Ryuji

• Yasu, Yukio

• Nakamura, Fumihiko

• Terasaki, Ichiro

抄録

We report the thermoelectric transport properties in the orbital-ordered Mott insulating phase of Ca2RuO4 close to and far from equilibrium. Near equilibrium conditions where the temperature gradient is only applied to the sample, an insulating but non-monotonic temperature variation of the Seebeck coefficient is observed, which is accounted for in terms of a temperature-induced suppression of the orbital order. In non-equilibrium conditions where we have applied high electrical currents, we find that the Seebeck coefficient is anomalously increased in magnitude with increasing external current. The present result clearly demonstrates a non-thermal effect since the heating simply causes a decrease of the Seebeck coefficient, implying a non-trivial non-equilibrium effect such as a modification of the spin and orbital state in currents.

収録刊行物

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 86 (9), 093707-093707, 2017-09-15

  日本物理学会

キーワード

• General Physics and Astronomy

詳細情報

• CRID: 1050282813782609920
• NII論文ID: 40021314369
• NII論文ID: 210000134496
• NII書誌ID: AA00704814
• DOI: 10.7566/jpsj.86.093707
• ISSN: 13474073
• ISSN: 00319015
• HANDLE: 2237/27150
• NDL書誌ID: 028506150
• Web Site: https://nagoya.repo.nii.ac.jp/records/24927
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028506150
• Web Site: http://journals.jps.jp/doi/pdf/10.7566/JPSJ.86.093707
• 本文言語コード: en
• 資料種別: journal article
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