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The nature of the first order isostructural transition in GdRhSn

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Title The nature of the first order isostructural transition in GdRhSn
 
Creator GUPTA, S
SURESH, KG
NIGAM, AK
MUDRYK, Y
PAUDYAL, D
PECHARSKY, VK
GSCHNEIDNER, KA
 
Subject Rare earth intermetallic
Iso-structural transition
Magnetocaloric effect
SN-119 MOSSBAUER-SPECTROSCOPY
MAGNETIC PHASE-TRANSITIONS
GDPDAL SINGLE-CRYSTALS
STANNIDES RERHSN RE
ELECTRONIC-STRUCTURE
TBRHSN
DYRHSN
ANOMALIES
TRANSPORT
HORHSN
 
Description We present structural, magnetic, thermal, magnetocaloric, and electrical transport properties of polycrystalline GdRhSn. Magnetization data show that it orders antiferromagnetically at T-N = 16.2 K. The compound has the ZrNiAl type hexagonal crystal structure at room temperature and undergoes a first order iso-structural transition in the paramagnetic state at 245 K. The unit cell volume change at the transition is small (-0.07%) but discontinuous, in agreement with the first-order nature of the transition observed by magnetic, transport, and heat capacity measurements. The anisotropic changes of the lattice parameters are Delta alpha/alpha = 0.28% and Delta c/c = 0.64% on cooling. A substantial change in the 4f and conduction electron hybridization, giving rise to an increased integrated DOS, occurs when the high temperature phase transforms to the low temperature phase. A moderate magnetocaloric effect at T-N (Delta S-M = 6.5 J/kg K and Delta T-ad = 4.5 K for Delta H = 50 kOe) has been measured using both magnetization and heat capacity data. (C) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T17:06:31Z
2014-12-28T17:06:31Z
2014
 
Type Article
 
Identifier JOURNAL OF ALLOYS AND COMPOUNDS, 613280-287
0925-8388
1873-4669
http://dx.doi.org/10.1016/j.jallcom.2014.06.027
http://dspace.library.iitb.ac.in/jspui/handle/100/16960
 
Language English