Specific heat of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
Journal Article
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· Physical Review, B: Condensed Matter
- Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305 (United States)
- Department of Physics, University of British Columbia, Vancouver, British Columbia, V6T1Z1 (CANADA)
We present measurements of the specific heat of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals from 2 to 10 K and from 0 to 10 T, including both twinned and untwinned crystals with various oxygen doping (7{minus}{delta}=6.95, 6.97, and 6.99). The zero-field specific heat includes a linear-T term which is small compared to other YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} samples, but large compared to the T{sup 2} electronic specific heat predicted for a superconductor with clean lines of nodes in the gap function. This zero-field linear-T term is found to decrease with decreasing concentration of twin boundaries and oxygen vacancies {delta}. The specific heat increases in a magnetic field and has a strong dependence on field orientation. Several possible field-dependent contributions are compared to the data, including a Schottky anomaly, vortex-vortex interactions, a traditional mixed-state HT term associated with vortex cores, and a {radical}(H)T term predicted by G. Volovik for the mixed state in superconductors with lines of nodes in the gap function. The field dependence of the specific heat, according to a comparison of fits based on these possibilities, supports the existence of lines of nodes and suggests the presence of quasiparticle excitations outside the vortex core. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 489571
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Sun Mar 31 23:00:00 EST 1991
· AIP Conference Proceedings (American Institute of Physics); (United States)
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OSTI ID:5101269