High-pressure studies on YNi(2)B(2)C at room temperature
DSpace at IIT Bombay
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Title |
High-pressure studies on YNi(2)B(2)C at room temperature
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Creator |
MEENAKSHI, S
VIJAYAKUMAR V RAO, RS GODWAL, BK SIKKA, SK RAVINDRAN, P HOSSAIN, Z NAGARAJAN, R GUPTA, LC VIJAYARAGHAVAN, R |
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Subject |
brillouin-zone
special points superconductivity luni2b2c systems solids ho er tm |
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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.
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Publisher |
AMER PHYSICAL SOC
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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 |
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Type |
Article
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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 |
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Language |
en
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