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The magnetic, electronic and optical properties of HoRhGe

DSpace at IIT Bombay

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Title The magnetic, electronic and optical properties of HoRhGe
 
Creator GUPTA, S
SURESH, KG
NIGAM, AK
KNYAZEV, YV
KUZ'MIN, YI
LUKOYANOV, AV
 
Subject magnetocaloric effect
magnetoresistance
electronic structures
optical properties
GIANT MAGNETORESISTANCE
NEUTRON-DIFFRACTION
HEAT-CAPACITY
TRANSITION
GD-5(SI2GE2)
GERMANIDES
CERHGE
TB
GD
DY
 
Description The physical properties of polycrystalline HoRhGe have been studied experimentally and theoretically. The compound orders antiferromagnetically with a Neel temperature (T-N) of 5.5 K. It shows a large negative magnetoresistance (MR) of 25% at T-N, for a field of 50 kOe. However, at 2 K and in lower fields, the MR is found to be positive with a magnitude of about 12%. The magnetocaloric effect has been estimated from both magnetization and heat capacity data and found to be large compared to many potential refrigerant materials in the same temperature range. The optical conductivity calculated theoretically from the ab initio results is in agreement with experimental values. The electronic structure calculations with the LSDA + U method accounting for the strong electronic correlations in the 4f shell of holmium show that the Ho 4f electronic states play a major role in determining its magnetic, electronic and optical properties.
 
Publisher IOP PUBLISHING LTD
 
Date 2014-12-28T11:28:25Z
2014-12-28T11:28:25Z
2014
 
Type Article
 
Identifier JOURNAL OF PHYSICS D-APPLIED PHYSICS, 47(36)
0022-3727
1361-6463
http://dx.doi.org/10.1088/0022-3727/47/36/365002
http://dspace.library.iitb.ac.in/jspui/handle/100/16359
 
Language English