Frequency dependence of the freezing temperature in spin glasses: A comparative study of (La, Gd)B6, (Y, Gd)Al2 and (La, Gd)Al2 |
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| Authors: | J. Aarts, W. Felsch, H. v. Lö hneysen F. Steglich |
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| Affiliation: | (1) II. Physikalisches Institut der Universität zu Köln, Zülpicher Straße 77, D-5000 Köln 41, Federal Republic of Germany;(2) I. Physikalisches Institut der Universität, Bunsenstraße 9, D-3400 Göttingen, Federal Republic of Germany;(3) 2. Physikalisches Institut der RWTH, Templergraben, D-5100 Aachen, Federal Republic of Germany;(4) Institut für Festkörperphysik der Technischen Hochschule, Hochschulstraße 2, D-6100 Darmstadt, Federal Republic of Germany;(5) Present address: Natuurkundig Laboratorium, Universiteit van Amsterdam, The Netherlands |
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| Abstract: | The frequency dependence of the freezing temperatureTf( ) is determined for the dilute spin glass systems (La, Gd)B6 and (Y, Gd)Al2 in the frequency range 10–1,000 Hz. While for (La, Gd)B6,Tf() is found to be weak, for (Y, Gd)Al2Tf() is even stronger than for the previously studied system (La, Gd)Al2. Both, measurements of the temperature dependence of the susceptibility nearTf and calculations of the RKKY pair interaction, suggest that this difference is correlated with a different sign of the nearest-neighbor interaction, which appears to be antiferromagnetic for (La, Gd)B6 and ferromagnetic for (Y, Gd)Al2 as well as (La, Gd)Al2. |
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