Abstract
Specific heat of a slightly overdoped YBa 2Cu 3O 7− δ single crystal has been measured at magnetic fields up to 12 T in low temperature region. By subtracting a spare linear term ( γ 0 T), the phonon contribution ( βT 3 + ηT 5) and the Schottky anomaly ( C Sch), we obtain the field induced change of the specific heat coefficient Δ γ which behaves as the A H 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 H c2(0) is then determined according to the expression of A = 0.74 γ n / H c 2 ( 0 ) in the framework of d-wave theory. This may be an alternative way to derive the H c2(0) value.
Published Version
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