High-pressure studies on YNi2B2C at room temperature

Meenakshi, S. ; Vijayakumar, V. ; Rao, R. S. ; Godwal, B. K. ; Sikka, S. K. ; Ravindran, P. ; Hossain, Z. ; Nagarajan, R. ; Gupta, L. C. ; Vijayaraghavan, R. (1998) High-pressure studies on YNi2B2C at room temperature Physical Review B, 58 (6). pp. 3377-3380. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v58/i6/p3377_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.58.3377

Abstract

The electronic and lattice structure, and equation of state behavior of YNi2B2C 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 (RNi2B2C, 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 YNi2B2C. 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 ThCr2Si2-type tetragonal structure prevailing under ambient conditions is preserved in YNi2B2C up to 6 GPa. Pressure-volume data on YNi2B2C 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 YNi2B2C and the weak pressure dependence of the superconducting-transition temperature can be correlated with the details of the electronic density of states.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:11659
Deposited On:13 Nov 2010 14:06
Last Modified:16 May 2016 21:06

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