Positron-lifetime studies in YNi2B2C

Sundar, C. S. ; Bharathi, A. ; Hariharan, Y. ; Radhakrishnan, T. S. ; Hossain, Z. ; Nagarajan, R. ; Gupta, L. C. ; Vijayaraghavan, R. (1996) Positron-lifetime studies in YNi2B2C Physical Review B: Condensed Matter and Materials Physics, 53 (3). R2971-R2974. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v53/i6/pR2971_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.53.R2971


Positron-lifetime measurements have been carried out in the temperature range of 300 to 5 K in the borocarbide superconductor, YNi2B2C. The positron lifetime 189 ps at 300 K is observed to decrease to 179 ps at 5 K. No change in lifetime is seen across the superconducting transition at ~16 K. The observed magnitude of lifetime and its temperature variation are discussed with support from theoretical computations of positron density distribution and annihilation characteristics for a perfect crystal of tetragonal YNi2B2C and for various plausible defect configurations. On the basis of these calculations, it is inferred that the lifetime and its temperature dependence are governed by positron annihilation from carbon vacancies.

Item Type:Article
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ID Code:61586
Deposited On:15 Sep 2011 12:00
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