Specific heat of EuxSrl-xTe

Scheer, Elke; Wosnitza, Joachim; Löhneysen, Hilbert von

Specific heat of EuxSrl-xTe

Dateien

02_Specific_heat_of_Scheer_ZPhysB.pdfGröße: 1.51 MBDownloads: 405

Datum

1991

Autor:innen

Scheer, Elke

Wosnitza, Joachim

Löhneysen, Hilbert von

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Zeitschrift für Physik B - Condensed Matter. 1991, 85, pp. 79-86. Available under: doi: 10.1007/BF01387790

Zusammenfassung

In this paper, we report on measurements of the specific heat C of single-crystalline EuSrTe at temperatures between 60 mK and 15 K and in magnetic fields up to 6 T. Pure antiferromagnetic EuTe shows unusual critical behavior in the vicinity of the N6el temperature T_N = 9.8 K with a positive critical exponent instead of the 3d-Heisenberg exponent a = -0.12. Possible reasons for this discrepancy between theory and experiment include magnetic anisotropy effects due to magnetic dipole-dipole interactions, which may give rise to a cross-over of the critical behavior very close to T_N. This anisotropy is also seen in the specific heat below 1 K where an exponential decay of C is observed, and in the dependence of the magnetic susceptibility on the direction of the applied field. With increasing dilution of EuTe with nonmagnetic Sr, the critical behavior changes: a becomes negative and decreases continuously. This concentration dependence of a was previously observed in the diluted ferromagnetic system EuSrS. Our data thus support that the apparent change in the critical behavior depends on the degree of disorder. Samples with concentration x lower than the critical concentration x_c reveal spin-glass behavior in the specific heat. In addition, the dependence of T_N on magnetic fields is discussed.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

SCHEER, Elke, Joachim WOSNITZA, Hilbert von LÖHNEYSEN, 1991. Specific heat of EuxSrl-xTe. In: Zeitschrift für Physik B - Condensed Matter. 1991, 85, pp. 79-86. Available under: doi: 10.1007/BF01387790

BibTex

@article{Scheer1991Speci-4710,
  year={1991},
  doi={10.1007/BF01387790},
  title={Specific heat of EuxSrl-xTe},
  volume={85},
  journal={Zeitschrift für Physik B - Condensed Matter},
  pages={79--86},
  author={Scheer, Elke and Wosnitza, Joachim and Löhneysen, Hilbert von}
}

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