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
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Creator |
GUPTA, S
SURESH, KG NIGAM, AK MUDRYK, Y PAUDYAL, D PECHARSKY, VK GSCHNEIDNER, KA |
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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 |
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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.
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Publisher |
ELSEVIER SCIENCE SA
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Date |
2014-12-28T17:06:31Z
2014-12-28T17:06:31Z 2014 |
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Type |
Article
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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 |
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Language |
English
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