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Specific Heat Linear Term in YBa2Cu3O7−x and a Survey of Related Compounds

  • A. P. Ramirez (a1), R. J. Cava (a1), G. P. Espinosa (a1), J. P. Remeika (a1), B. Batlogg (a1), S. Zahurak (a1) and E. A. Rietman (a1)...

We have measured the specific heat, C, in the temperature range 0.3 to 20K and in magnetic fields up to 12 Tesla of several compounds related to the high-Tc superconductors. The linear term in C for YBa2Cu3O7−x is only weakly dependent on oxygen concentration in the range 0 ≤ × ≤ 0.7. The linear term in C changes by less than 10% at 10 Tesla for La1.98Sr.02CuO4, whereas for YBa2Cu3O7−x it is obscured by additional field-dependent structure. Magnetic ordering anomalies are observed in YBa2Cu2O5 at 10.6 K and in BaCuO2+6 at 9.3 K.

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[1] Ramirez, A. P., Batlogg, B., Aeppli, G., Cava, R. J., Rietman, E., Goldman, A. and Shirane, G., Phys. Rev. B, 35, 8833 (1987).
[2] Anderson, P. W., Science 235, 1196 (1987), and
Anderson, P. W., Baskaran, G., and Hsu, T., Phys. Rev. Lett., 58, 2790 (1987).
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Graebner, J. E., Cava, R. J. and Rietman, E., to appear;
Abraham, E. and Varrna, C. M., to appear.
[4] Cava, R. J., van Dover, R. B., Batlogg, B., and Rietman, E. A., Phys. Rev. Lett. 58, 408 (1987), and
Cava, R. J., Batlogg, B., van Dover, R. B., Murphy, D. W., Sunshine, S., Siergrist, T., Remeika, J. P., Zahurak, S. M. and Espinosa, G. P., Phys. Rev. Lett. 58, 1676 (1987).
[5] Cava, R. J., Batlogg, B., Chen, C. H., Rietman, E. A., Zahurak, S. M., and Werder, D., Phys. Rev. Lett. 36, 5719 (1987).
[6] Shirane, G., Endoh, Y., Birgeneau, R. J., Kastner, M. A., Hidaka, Y., Oda, M., Suzuki, M., and Murakami, T., to be published.
[7] Phillips, N. E., Fisher, R. A., Lacy, S. E., Marcenat, C, Olsen, J. A., Ham, W. K., Stacy, A. M., Gordon, J. E., and Tan, M. L., Yamada Conference on Superconductivity, Sendai, Japan, August 1987.
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  • ISSN: -
  • EISSN: 1946-4274
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