Temperature and magnetic field induced structural transformation in Si-doped CeFe2: An in-field X-ray diffraction study

TitleTemperature and magnetic field induced structural transformation in Si-doped CeFe2: An in-field X-ray diffraction study
Publication TypeJournal Article
Year of Publication2010
AuthorsHaldar A, Singh NK, Mudryk Y, Suresh KG, Nigam AK, Pecharsky VK
Journal TitleSolid State Communications
Volume150
Pages879-883
Date Published05/01
ISBN Number0038-1098
Accession NumberISI:000276781600018
Keywordsintermetallics, magnetostructural coupling, Phase coexistence, supercooling
Abstract

Using the X-ray powder diffraction technique at various temperatures and applied magnetic fields, we have studied the magnetostructural properties of Ce(Fe0.9Si0.05)(2). The X-ray diffraction data establish quantitative relationships between bulk magnetization and the evolution of structurally distinct phases with magnetic field and temperature, and confirm the distinct features of a first-order phase transition such as supercooling and superheating. metastability, and phase co-existence of different structural polymorphs We observe the lattice volume mismatch across the structural phase transition, which appears to be the cause for the step behavior of the magnetization isotherms at low temperatures. The present study shows that the lattice distortion has to be treated explicitly, like spin, along with the effects of lattice-spin coupling to account for the magnetization behavior of this system. This structure template can resolve the issue of kinetics in this material as observed in different time scale measurements and with different experimental protocols (C) 2010 Elsevier Ltd All rights reserved.

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