Dynamics of the lattice and spins in the phase-separated manganite (Eu1-xGdx)0.6Sr0.4MnO3

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:432

Article

Taniguchi, Haruka¹  Kimura, Daichi¹  Matsukawa, Michiaki¹  Inomata, Tasuku¹  Kobayashi, Satoru¹  Nimori, Shigeki²  Suryanarayanan, Ramanathaan³ 

[1] Iwate Univ, Dept Phys Sci & Mat Engn, Morioka, Iwate 0208551, Japan

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[3] Univ Paris 11, CNRS, UMR8182, Lab Physicochim Etat Solide, F-91405 Orsay, France

关键词: Phase separation;    Non-equlibrium phenomenon;    Substitution effect;   

DOI  :  10.1016/j.jmmm.2017.02.039

来源: Elsevier

【 摘 要 】

We investigated slow relaxations of the magnetostriction and residual magnetostriction of the phase-separated system (Eu1-xGdx)(0.6)Sr0.4MnO3, in which the metamagnetic transition from a paramagnetic insulating state to a ferromagnetic metallic state is accompanied by a lattice shrinkage. The relaxations are well fitted by a stretched exponential function, suggesting the strong frustration between the double exchange interaction and Jahn-Teller effect. We have revealed that the Gd substitution suppresses the frozen phase-separated phase at low temperatures and stabilizes the paramagnetic insulating state in the dynamic phase-separated phase at intermediate temperatures. The former origin would be the randomness effect and the latter would be the suppression of the double exchange interaction. (C) 2017 Elsevier B. V. All rights reserved.

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