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The temperature dependence of upper critical field B_c2 was determined fromthe shift of resistive transition \Delta T(B) in nearly optimally dopedNd_{2-x}Ce_xCuO_{4-y} single crystals. Within the experimental accuracy, theweak-field data are described by power function B_c2 ~ (\Delta T)^{3/2}. Thisresult is compared with the data on heat capacity and analyzed in the contextof possible manifestations of boson effects in superconductivity. Thetemperature dependence of B_c2 persists down to the lowest temperatures, butthe numerical values of B_c2 below 1 K are different for different samples.Comment: 5 pages, 4 EPS figure

Temperature dependence of the upper critical field as an indicator of boson effects in superconductivity in Nd2−x CexCuO4−y