Low Temperature Specific Heat in Lightly Mn-Substituted Electron-Doped SrTiO₃

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Tetsuji Okuda¹^,²^,, Hiroto Hata¹, Takahiro Eto¹, Shogo Sobaru¹, Ryosuke Oda³, Masaaki Noda³, and Hideki Kuwahara³

+ Affiliations

¹Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan²JST, CREST, Chiyoda, Tokyo 102-0076, Japan³Department of Physics, Sophia University, Chiyoda, Tokyo 102-8554, Japan

Received March 2, 2017; Accepted May 29, 2017; Published July 6, 2017

We found large changes in the low-temperature specific heat (low-T C) in the lightly Mn-substituted electron-doped perovskites Sr_0.95La_0.05Ti₁₋_yMn_zO₃ with y = 0.02 and 0.04 by applying magnetic fields up to 9 T. The changes in the low-T C are qualitatively well explained by the Schottky specific heat (C_Sch) of localized spins of the Mn 3d electrons in weak internal magnetic fields via itinerant electrons. However, the actual numbers of localized spins estimated from C_Sch are about 30% smaller than the expected values. Part of the localized spins of the Mn 3d electrons may disappear due to Kondo coupling with the itinerant electrons.

https://doi.org/10.7566/JPSJ.86.084601

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Low Temperature Specific Heat in Lightly Mn-Substituted Electron-Doped SrTiO3

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Low Temperature Specific Heat in Lightly Mn-Substituted Electron-Doped SrTiO₃