Exchange bias and spin-phonon coupling in complex glassy layered perovskite SrLaMn0.5Ni0.5O4

Ranjana R. Das; P. Neenu Lekshmi; Padmam N. Santhosh

doi:10.1063/1.5043037

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Exchange bias and spin-phonon coupling in complex glassy layered perovskite SrLaMn0.5Ni0.5O4

Ranjana R. Das, P. Neenu Lekshmi,

Published in American Institute of Physics Inc.

2018

DOI: 10.1063/1.5043037

Volume: 8

Issue: 10

Abstract

In the present work, single-layered polycrystalline Ruddlesden-Popper oxide, SrLaMn0.5Ni0.5O4 (SLMNO) has been synthesized and characterized. X-ray diffraction and Raman spectroscopy revealed tetragonal crystal structure (I4/mmm) with lattice parameters of a = b = 3.8388 (4) Å and c =12.5593 (2) Å. XPS analysis confirms Mn4+/Ni2+ as the major valance state in SLMNO. Temperature evolution of dc magnetization suggests a ferromagnetic ordering below 130 K followed by a glassy like behaviour below 13 K. The ac susceptibility measurement corroborates the dc magnetization data and confirms cluster glass behavior at lower temperatures. Interestingly, SLMNO exhibits a negative exchange bias of ∼ 0.075 kOe at 5 K under field cooling of 50 kOe and also shows the existence of spin-phonon coupling. © 2018 Author(s).