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

We found large changes in the low-temperature specific heat (low-T C) in the lightly Mn-substituted electron-doped perovskites Sr0.95La0.05Ti 1-yMnzO3 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 he...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2017-08, Vol.86 (8)
Main Authors: Okuda, Tetsuji, Hata, Hiroto, Eto, Takahiro, Sobaru, Shogo, Oda, Ryosuke, Noda, Masaaki, Kuwahara, Hideki
Format: Article
Language:English
Subjects:
Doping
Electron spin
Electrons
Expected values
Heat
Low temperature
Low temperature physics
Magnetic fields
Manganese
Perovskite
Perovskites
Specific heat
Strontium titanates
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Summary:We found large changes in the low-temperature specific heat (low-T C) in the lightly Mn-substituted electron-doped perovskites Sr0.95La0.05Ti 1-yMnzO3 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.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.86.084601