Type of Publication: | Journal article |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-24561 |
Author: | Köbler, Ulrich; Apfelstedt, I.; Fischer, K.; Zinn, W.; Scheer, Elke; Wosnitza, Jochen; Löhneysen, Hilbert von; Brückel, Thomas |
Year of publication: | 1993 |
Published in: | Zeitschrift für Physik / B ; 92 (1993), 4. - pp. 475-487 |
DOI (citable link): | https://dx.doi.org/10.1007/BF01320511 |
Summary: |
Magnetization, specific heat, magnetocaloric effect, and neutron diffraction measurements have been performed in order to better understand the magnetic interactions and phase transitions in the diluted antiferromagnetic system EuxSrl_xTe. Due to the low N6el temperature of TN=9.8 K and the associated small critical field of Be(T= 0)= 7.5 T, EuTe provides the opportunity to change the angle between the antiferromagnetic moments continuously between 180 ~ and 0 ~ by applying a magnetic field and allows thus to probe the type of the magnetic interaction. It is found that in addition to the common bilinear Heisenberg exchange mechanism there is evidence for a small biquadratic exchange term, which has important consequences on the critical behaviour of EuxSr~_xTe. In the case of EuTe the biquadratic exchange supports the antiferromagnetic order, such that virtually no anisotropy exists and this restricts the antiferromagnetic (AF) to spin-flop (SF) transition to B0 = 0. On dilution with strontium, the biquadratic interaction decreases strongly and changes its sign at x~0.83 thus favouring the perpendicular moment orientation. This acts like an anisotropy on the dominating antiferromagnetic bilinear interaction and shifts the AF-SF phase line to finite fields which reach values of 0.3 T for T~ 0. No bicritieal behaviour is observed, but instead, the SF phase is the state of lowest energy in a small temperature interval below TN. The critical exponent ~(x) of the specific heat decreases in a non-linear way with dilution starting from a large positive value for EuTe. e(x) is close to the Heisenberg value -0.12 near x~0.83 where the biquadratic interaction is zero. The same applies for the exponent fl of the sublattice magnetization.
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Subject (DDC): | 530 Physics |
Link to License: | Attribution-NonCommercial-NoDerivs 2.0 Generic |
KÖBLER, Ulrich, I. APFELSTEDT, K. FISCHER, W. ZINN, Elke SCHEER, Jochen WOSNITZA, Hilbert von LÖHNEYSEN, Thomas BRÜCKEL, 1993. Biquadratic exchange and critical behaviour in the diluted antiferromagnet Eu-Sr-Te. In: Zeitschrift für Physik / B. 92(4), pp. 475-487. Available under: doi: 10.1007/BF01320511
@article{Kobler1993Biqua-8968, title={Biquadratic exchange and critical behaviour in the diluted antiferromagnet Eu-Sr-Te}, year={1993}, doi={10.1007/BF01320511}, number={4}, volume={92}, journal={Zeitschrift für Physik / B}, pages={475--487}, author={Köbler, Ulrich and Apfelstedt, I. and Fischer, K. and Zinn, W. and Scheer, Elke and Wosnitza, Jochen and Löhneysen, Hilbert von and Brückel, Thomas} }
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