| Issue |
J. Phys. Colloques
Volume 49, Number C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-2133 - C8-2134 | |
| DOI | https://doi.org/10.1051/jphyscol:19888954 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-2133-C8-2134
DOI: 10.1051/jphyscol:19888954
Department of Physics, Faculty of Science, Hokkaido University, Sapporo, 060 Japan
J. Phys. Colloques 49 (1988) C8-2133-C8-2134
DOI: 10.1051/jphyscol:19888954
TEMPERATURE-LINEAR TERM OF HEAT CAPACITY OF La-Ba-Cu-O AND La-Sr-Cu-O SYSTEMS
K. Kumagai, Y. Nakamura, I. Watanabe, Y. Nakamichi et H. NakajimaDepartment of Physics, Faculty of Science, Hokkaido University, Sapporo, 060 Japan
Abstract
Heat capacity of La2-xMxCuO4 (M = Ba, Sr) has been investigated between 1.5 and 10 K. The temperature e-linear term, γT, of heat capacity is absent in the antiferromagnetic ordered region of x < 0.02. γ increases abruptly from x = 0.02 to x = 0.05 where the system is insulating at low temperature and reaches of the order of 4mJ/mol.K2. The appearance of the finite γ between the AF and SC state causes clearly to spin degrees of freedom. In the superconducting region, γ changes strongly with x and seems to be vanishingly small at x = 0.10 for Ba-doping and 0<x<0.20 for Sr-doping.