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Magnetic Properties of Heisenberg Antiferromagnetic EuTe/PbTe Superlattices

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Abstract

Bulk EuTe is a type II Heisenberg antiferromagnet (AF2) with a single magnetic phase transition temperature at 9.6 K. However, for several isolated EuTe (111) monolayers (MLs) as can be achieved in a superlattice (SL) structure, both ferrimagnetic-like and antiferromagnetic-like phase transitions can take place, depending on the SLs configuration. The temperature-dependent magnetizationM(T) of such SLs has been studied near the transition temperature (Tc) by SQUID magnetometry. The functional forms ofM(T) atT ≤ Tc can be described by mean-field theory for SLs with 3, 4 and 5 EuTe MLs per SL cell. The magnetic transition temperatures obtained by mean-field analysis, using bulk exchange coupling values, are in close agreement with observedTc values for SLs with 2, 3, 4 and 5 EuTe MLs. The qualitative behavior of the surface specific heat can be deduced fromM(T) data for SLs with three EuTe monolayers.

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Authors and Affiliations

  1. Department of Physics, Massachusetts Institute of Technology, USA

    J. J. Chen & M. S. Dresselhaus

  2. Francis Bitter National Magnet Laboratory, MIT, USA

    G. Dresselhaus

  3. Johannes Kepler Universitãt, Linz, Austria

    G. Springholz & G. Bauer

Authors
  1. J. J. Chen
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  2. G. Dresselhaus
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  3. M. S. Dresselhaus
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  4. G. Springholz
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  5. G. Bauer
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Chen, J.J., Dresselhaus, G., Dresselhaus, M.S. et al. Magnetic Properties of Heisenberg Antiferromagnetic EuTe/PbTe Superlattices. MRS Online Proceedings Library 358, 1041 (1994). https://doi.org/10.1557/PROC-358-1041

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  • DOI: https://doi.org/10.1557/PROC-358-1041

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