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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/16502

Title: High-pressure studies on YNi(2)B(2)C at room temperature
Authors: MEENAKSHI, S
VIJAYAKUMAR V
RAO, RS
GODWAL, BK
SIKKA, SK
RAVINDRAN, P
HOSSAIN, Z
NAGARAJAN, R
GUPTA, LC
VIJAYARAGHAVAN, R
Keywords: brillouin-zone
special points
superconductivity
luni2b2c
systems
solids
ho
er
tm
Issue Date: 1998
Publisher: AMER PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 58(6), 3377-3380
Abstract: 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.
URI: 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
ISSN: 1098-0121
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