Dependence of the low-temperature specific heat of RBa2Cu3Ox ceramics on the nature of the rare-earth ion R
Anshukova N. V. , Bugoslavskii Yu. V., Veselago V. G. , Golovashkin A. I., Ershov O. V. , Zaitsev I. A., Ivanenko O. M., A. A. Kordyuk, Minakov A. A., Mitsen K. V.
That component of the low-temperature specific heat of the high-temperature superconductors which is linear in the temperature has been found to be highly sensitive to a substitution of magnetic rare-earth ions for nonmagnetic Y. The low-temperature anomaly in the phonon specific heat is described by a model of a uniaxial crystal.