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Andreev-reflection study of superconducting RNi(2)B(2)C compounds
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UNSPECIFIED (1996) Andreev-reflection study of superconducting RNi(2)B(2)C compounds. In: 2nd International Conference on Point-contact Spectroscopy, NIJMEGEN, NETHERLANDS, JUN 07-10, 1995. Published in: PHYSICA B, 218 (1-4). pp. 189-192. ISSN 0921-4526.
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Abstract
A comparative study has been made of the current-voltage characteristics of RNi(2)B(2)C-Ag point contacts with R = Y, Er, and Ho, at various temperatures and magnetic fields. At low temperatures the double-minimum structure in the differential resistance dV/dI, characteristic for Andreev-reflection processes, can be well described by the Blonder-Tinkham-Klapwijk (BTK) model, yielding an energy gap Delta = 2.42 +/- 0.07, 1.7 +/- 0.2, and 1.04 +/- 0.06 meV for, respectively, the Y-, Er-, and He-based compounds. For the Y- and Er-based compounds, the temperature dependence of the spectra is in quantitative agreement with the BTK prediction. However for the He-based compound, an anomalous temperature dependence with two superconducting transitions at 8.5 and 6.5K has been observed. The ratio 2 Delta/k(B)T(c) amounts about 3.7 for all compounds (providing one takes T-c* similar or equal to 6.5K for the critical temperature of the Ho compound), corresponding to a moderate electron-phonon coupling strength.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICA B | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0921-4526 | ||||
Official Date: | February 1996 | ||||
Dates: |
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Volume: | 218 | ||||
Number: | 1-4 | ||||
Number of Pages: | 4 | ||||
Page Range: | pp. 189-192 | ||||
Publication Status: | Published | ||||
Title of Event: | 2nd International Conference on Point-contact Spectroscopy | ||||
Location of Event: | NIJMEGEN, NETHERLANDS | ||||
Date(s) of Event: | JUN 07-10, 1995 |
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