Magnetic-field dependence of the specific heat of YBa[sub 2]Cu[sub 3]O[sub 7]

Specific-heat measurements on YBa[sub 2]Cu[sub 3]O[sub 7] in magnetic fields to 7 T have shown the presence of Schottky anomalies with the field and temperature dependence expected for a fixed concentration of Cu[sup 2+] magnetic moments. The field-dependent part of the specific heat also includes a temperature-proportional contribution that is approximately proportional to field. These results are qualitatively different from those reported recently from another laboratory.