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High-pressure studies on YNi(2)B(2)C at room temperature

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Title High-pressure studies on YNi(2)B(2)C at room temperature
 
Creator MEENAKSHI, S
VIJAYAKUMAR V
RAO, RS
GODWAL, BK
SIKKA, SK
RAVINDRAN, P
HOSSAIN, Z
NAGARAJAN, R
GUPTA, LC
VIJAYARAGHAVAN, R
 
Subject brillouin-zone
special points
superconductivity
luni2b2c
systems
solids
ho
er
tm
 
Description The electronic and lattice structure, and equation of state behavior of YNi(2)B(2)C has been investigated by electrical resistivity, thermoelectric power, and angle-dispersive x-ray-diffraction measurements. The electrical resistance under pressure has also been measured for other lanthanide-nickel borocarbides (RNi(2)B(2)C, R=Ho, Er, and Tm). The high pressure behavior is analyzed by electronic band-structure [tight-binding linear muffin-tin orbital (LMTO) and full-potential LMTO] calculations on YNi(2)B(2)C. The measured thermoelectric power shows a peak around 2 GPa pressure. X-ray powder diffraction measurements of the lattice parameter under pressure reveal that the carbon-filled variant of ThCr(2)Si(2)-type tetragonal structure prevailing under ambient conditions is preserved in YNi(2)B(2)C up to 6 GPa. Pressure-volume data on YNi(2)B(2)C yielded a bulk modulus of 200 GPa. This is in agreement with the value computed by the first-principles electronic-structure calculations. It is also shown that the observed peak in the thermoelectric power in YNi(2)B(2)C and the weak pressure dependence of the superconducting-transition temperature can be correlated with the details of the electronic density of states.
 
Publisher AMER PHYSICAL SOC
 
Date 2011-11-01T04:04:05Z
2011-12-26T13:00:14Z
2011-12-27T05:53:32Z
2011-11-01T04:04:05Z
2011-12-26T13:00:14Z
2011-12-27T05:53:32Z
1998
 
Type Article
 
Identifier PHYSICAL REVIEW B, 58(6), 3377-3380
1098-0121
http://dx.doi.org/10.1103/PhysRevB.58.3377
http://dspace.library.iitb.ac.in/xmlui/handle/10054/16502
http://hdl.handle.net/10054/16502
 
Language en