Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9841550 | Physica C: Superconductivity and its Applications | 2005 | 6 Pages |
Abstract
Specific heat of a slightly overdoped YBa2Cu3O7âδ single crystal has been measured at magnetic fields up to 12 T in low temperature region. By subtracting a spare linear term (γ0T), the phonon contribution (βT3 + ηT5) and the Schottky anomaly (CSch), we obtain the field induced change of the specific heat coefficient Îγ which behaves as the AH dependence (A is a constant) in zero-temperature limit and satisfies the Simon-Lee scaling law at finite temperatures, as expected by pure d-wave theory. The upper critical field Hc2(0) is then determined according to the expression of A=0.74γn/Hc2(0) in the framework of d-wave theory. This may be an alternative way to derive the Hc2(0) value.
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Authors
H. Gao, Y. Wang, L. Shan, X. Yao, H.H. Wen,