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Observation of large positive magnetoresistance and its sign reversal in GdRhGe

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Title Observation of large positive magnetoresistance and its sign reversal in GdRhGe
 
Creator GUPTA, S
SURESH, KG
NIGAM, AK
 
Subject Metamagnetic transition
Antiferromagnet
Magnetoresistance
Magnetocaloric effect
GIANT MAGNETORESISTANCE
MAGNETISM
ND
 
Description Magnetic properties, heat capacity and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T-1 = 31.8 K and the other at T-2 = 24 K, and field induced metamagnetic transition over a wide temperature range. The ac susceptibility data reveal that the transition at 24 K is not simple antiferromagnetic. Dominant contributions to the heat capacity and the resistivity have been identified. MR is found to show sign reversal just below T1 and attains a large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied, indicating a change of the magnetic structure and the moment amplitude in determining these properties. (C) 2013 Elsevier B. V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T17:03:26Z
2014-12-28T17:03:26Z
2014
 
Type Article
 
Identifier JOURNAL OF ALLOYS AND COMPOUNDS, 586600-604
0925-8388
1873-4669
http://dx.doi.org/10.1016/j.jallcom.2013.10.123
http://dspace.library.iitb.ac.in/jspui/handle/100/16954
 
Language English