Abstract
The low-frequency ac magnetic susceptibility of (La1−x Gd x )B6 alloys (0.0035≦x≦0.0812) was measured between 0.04 and 10 K in very low and moderate applied magnetic fields up to 8 kOe. In addition, the low-field static susceptibility was measured between 4.2 and 200 K. At low temperatures the alloys exhibit the basic features of the spin glass state, that is sharp maxima and time dependent effects in the low-field ac susceptibility. The temperature and field dependence of the susceptibility follows a law of corresponding states forx≦0.01, which is characteristic for Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions. Effects from interactions between the Gd ions observed above the freezing temperature are consistent with a recent theory based on a virial expansion of the magnetic free energy for the RKKY model and yield |J|=0.04 eV for the magnitude of thes−f exchange integral. The same value is obtained from the initial susceptibility atT→0 when compared with a molecular-field result. Above 1 K the initial susceptibility follows a single-impurity Curie law with the free-ion value of the magnetic moment of the Gd solute.
Similar content being viewed by others
References
For reviews of the experimental situation, see Mydosh, J.A.: AIP Conference Proceedings24, 131 (1975) and Proceedings of the Intern. Conf. on Magnetic Alloys and Oxides, Haifa 1977, to be published in J. Magn. and Magn. Mat.
For a recent review of the theoretical situation, see for example Fischer, K.H.: Physica86–88 B, 813 (1977)
Ruderman, M.A., Kittel, C.: Phys. Rev.96, 99 (1954) Kasuya, T.: Progr. Theor. Phys. (Kyoto)16, 45 (1956) Yosida, K.: Phys. Rev.106, 893 (1957)
Tholence, J.L., Tournier, R.: J. Phys. (Paris)35 C 4, 229 (1974); Physica86–88 B, 873 (1977)
Certain aspects of the low-field susceptibility have been briefly discussed by the author in: J. Magn. and Magn. Mat.6, 103 (1977)
Felsch, W.: Z. Physik B29, 211 (1978)
Souletie, J., Tournier, R.: J. Low Temp. Phys.1, 95 (1969)
Sarkissian, B.V.B.: J. Phys. F: Metal Phys.7, L 139 (1977)
Smith, F.W.: Phys. Rev. B14, 241 (1976), and references cited therein
Binder, K., Schröder, K.: Phys. Rev. B14, 2142 (1976)
See, for example, Poon, S.J., Durand, J.: Comm. Phys.2, 87 (1977)
Larkin, A.I., Khmelnitskii, D.E.: Sov. Phys. JETP31, 958 (1970) Larkin, A.I., Melnikov, V.I., Khmelnitskii, D.E.: Sov. Phys. JETP33, 458 (1971)
Matho, K., preprint.
Matho, K.: Physica86–88 B, 854 (1977)
Hou, Pon-Wei, Coles, B.R.: Phys. Rev. Letters35, 1655 (1975)
For the significance ofT 1 see Matho, K., Béal-Monod, M.T.: Phys. Rev. B5, 1899 (1972)
Chouteau, G.: Thesis, University of Grenoble 1973, cited in ref. 14
Smith, F.W.: Phys. Rev. Letters36, 1221 (1976)
Johnson, R.W., Daane, A.H.: J. Chem. Phys.38, 425 (1963); Tanaka, T., Banai, E., Kawai, S., Yamane, T.: Journal of Crystal Growth30, 193 (1975)
Arko, A.J., Crabtree, G., Ketterson, J.B., Mueller, F.M., Walch, P.F., Windmiller, L.R., Fisk, Z., Hoyt, R.F., Mota, A.C., Visvanathan, R., Ellis, D.E., Freeman, A.J., Rath, J.: Int. J. of Quantum Chemistry Symp. No.9, 569 (1975)
Arko, A.J., Crabtree, G., Karim, D., Mueller, F.M., Windmiller, L.R., Ketterson, J.B., Fisk, Z.: Phys. Rev. B13, 5240 (1976)
Walch, P.F., Ellis, D.E., Mueller, F.M.: Phys. Rev. B15, 1859 (1977)
Sperlich, G., Janneck, K.H., Buschow, K.H.J.: phys. stat. sol. (b)57, 701 (1973)
Glaunsinger, W.S.: J. Phys. Chem. Sol.37, 51 (1976)
Klein, M.W.: Phys. Rev.173, 552 (1968); Phys. Rev.188, 933 (1969)
Sakurai, J., Kubo, Y., Kondo, T., Pierre, J., Bertaut, E.F.: J. Phys. Chem. Solids34, 1305 (1973)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Felsch, W. Spin-glass behavior of (La, Gd)B6 alloys. Z Physik B 29, 203–210 (1978). https://doi.org/10.1007/BF01321184
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01321184