Temperature Dependence of Upper Critical Field as an Indicator of Boson Effects in Superconductivity in NdCeCuO
Abstract
The temperature dependence of upper critical field Bc2 was determined from the shift of resistive transition T(B) in nearly optimally doped Nd2-xCexCuO4-y single crystals. Within the experimental accuracy, the weak-field data are described by power function Bc2 ~ ( T)3/2. This result is compared with the data on heat capacity and analyzed in the context of possible manifestations of boson effects in superconductivity. The temperature dependence of Bc2 persists down to the lowest temperatures, but the numerical values of Bc2 below 1 K are different for different samples.
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