Hexagonal Sr0.6Ba0.4MnO3: Spin and dipole coupling via local structure

被引：4
|
作者：
Rawat, Ritu [1 ]
Choudhary, R. J. [1 ]
Awasthi, A. M. [1 ]
Sagdeo, Archna [2 ]
Sinha, A. K. [2 ]
Raghunathan, Rajamani [1 ]
Sathe, V. G. [1 ]
Phase, D. M. [1 ]
机构：
[1] UGC DAE, Consortium Sci Res, Indore 452001, Madhya Pradesh, India
[2] Raja Ramanna Ctr Adv Technol, Indus Synchrotrons Utilizat Div, Indore 452013, Madhya Pradesh, India
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 796卷
关键词：
Antiferromagnetic; Ferroelectric; Magneto-electric;
D O I：
10.1016/j.jallcom.2019.05.003
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Hexagonal Sr0.6Ba0.4MnO3 (SBMO) follows P6(3)/mmc symmetry where MnO6 octahedra are both face-shared (Mn2O9 bioctahedra) and corner-shared via oxygen anion. It undergoes ferroelectric (FE) and antiferromagnetic (AFM) orderings close to the room temperature. Magnetic properties appear to be governed by intricate exchange interactions among Mn4+ ions within and in adjacent Mn2O9 bioctahedra, contingent upon the local structural changes. Calculations based on our model spin-Hamiltonian reveal that the dominant linear AFM fluctuations between the Mn4+ ions of two oxygen-linked bi-octahedra result in short range correlations, manifest as a smooth drop in magnetization below 325 K. Competition between spin-exchange and local-strain is reckoned as responsible for the atypical magneto-electricity, obtained near the room temperature. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码：237 / 242
页数：6
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