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Journal Articles

X-ray absorption spectroscopy and magnetocaloric study of Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ (0$$leq x leq$$0.5)

Matsumura, Daiju; Tsuji, Takuya; Yoshii, Kenji

Materials Chemistry and Physics, 238, p.121885_1 - 121885_5, 2019/12

https://doi.org/10.1016/j.matchemphys.2019.121885
 Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)

We have conducted X-ray absorption spectroscopy study for perovskite cobaltite Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ (0$$leq x leq$$0.5) to understand Sr doping effect and magnetocaloric measurement for Pr$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ to reveal the origin of magnetic anomaly at around 110 K. The extended X-ray absorption fine structure (EXAFS) measurements at the Co ${it K}$-edge suggest that the average valence value of Co ions increases, the interatomic distance of Co-O bonding decreases, and the local distortion of CoO$$_{6}$$ octahedron increases as Sr is doped in PrCoO$$_{3}$$. The interatomic distance of Co-O bonding shrinks more greatly for the larger doping region. No temperature dependent electronic and structural changes were observed from Co ${it K}$-edge X-ray absorption spectra in the whole thermal range studied (17-300 K). The magnetocaloric effect of Pr$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ indicates the change of magnetic structure at 110 K.

Journal Articles

Large reversible magnetocaloric effect in ferromagnetic semiconductor EuS

Li, D. X.*; Yamamura, Tomoo*; Nimori, Shigeki*; Homma, Yoshiya*; Honda, Fuminori*; Haga, Yoshinori; Aoki, Dai*

Solid State Communications, 193, p.6 - 10, 2014/09

https://doi.org/10.1016/j.ssc.2014.05.024
 Times Cited Count：26 Percentile：68.52(Physics, Condensed Matter)

Oral presentation

Short-range ordering of magnetic refrigerant materials $$R_5$$Pd$$_2$$ (R = Ho, Tb) by neutron diffraction

Kitazawa, Hideaki*; Kawamura, Yukihiko*; Keller, L.*; Terada, Noriki*; Suzuki, Hiroyuki*; Mamiya, Hiroaki*; Doenni, A.*; Lee, S.*; Metoki, Naoto; Kaneko, Koji; et al.

no journal, , 

Antiferromagnetic Ho$$_5$$Pd$$_2$$($$T_{rm N} = 28$$K) with cubic structure accompanies very large magneto-calorimetric eefect (MCE) at 34K. We showed that this compound remains short range order with incommensurate modulation $$k=$$[0.18,0.18,0.18] developing at low temperatures. The short range correlation increases below 70K in Tb$$_5$$Pd$$_2$$($$T_g = 70$$K).

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