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Magnetic Properties of Heisenberg Antiferromagnetic EuTe/PbTe Superlattices

Published online by Cambridge University Press:  28 February 2011

J.J. Chen ,
G. Dresselhaus ,
M.S. Dresselhaus ,
G. Springholz  and
G. Bauer
J.J. Chen
Affiliation:
Department of Physics, Massachusetts Institute of Technology, USA
G. Dresselhaus
Affiliation:
Francis Bitter National Magnet Laboratory, MIT, USA
M.S. Dresselhaus
Affiliation:
Department of Physics, Massachusetts Institute of Technology, USA
G. Springholz
Affiliation:
Johannes Kepler Universitãt, Linz, Austria
G. Bauer
Affiliation:
Johannes Kepler Universitãt, Linz, Austria
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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 magnetization M(T) of such SLs has been studied near the transition temperature (Tc) by SQUID magnetometry. The functional forms of M(T) at T ≤ 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 observed Tc values for SLs with 2, 3, 4 and 5 EuTe MLs. The qualitative behavior of the surface specific heat can be deduced from M(T) data for SLs with three EuTe monolayers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 1041
Copyright
Copyright © Materials Research Society 1995

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References

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