Abstract
Heat capacities have been measured for the high Tc superconductors LnBa2Cu3O7-y (Ln=Y, Nd, Sm, Gd, Ho, Er) between 0.4K and 100K. A cooperative heat capacity peak has been found at Tm=0.585K for SmBa2Cu3O7-y, 2.21K for GdBa2Cu3O7-y and 0.60K for ErBa2Cu3O7-y. In addition, broad heat capacity anomalies are found between 1K and 5K for all the compounds of magnetic rare earths studied. A semiquantitative fit can be obtained assuming that there exist two nearly independent systems of rare earth ions in LnBa2Cu3O7-y, namely, a 2–d Ising system which is responsible for the sharp heat capacity peak and a 1–d Ising system which causes the rounded maximum.
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