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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

Online
ISSN
1865-7109
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Volume 31, Issue 12

Issues

Nachweis einer antiparallelen Spinkopplung in paramagnetischem Manganoxid / Proof of Antiparallel Spin-Coupling in Paramagnetic Manganese Oxid

K. Dräger / G. Kratz
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1976-1226

Abstract

For temperatures above the Néel-point it is shown that there are severe deviations from pure paramagnetism in the ESR-behaviour of stoechiometric MnO. The experimental results in the temperature range between 130 K and 480 K are interpreted by a model of local order. The excitation energy necessary to decouple the antiferromagnetic bonding is computed to be about ΔE= 250 ± 15 cm-1 . For a temperature of T=TN +10 we derive that according to this theory 73% of all spins in MnO still remain in antiparallel order.

Further calculations show that the bonding is compatible with an isotropic exchange interaction of next nearest neighbours having a coupling constant of J2 = 3.42 K. Finally, an interesting aspect is discussed connecting the formation of antiferromagnetic clusters and the absorption behaviour of MnO in the far infrared.

About the article

Received: 1976-11-05

Published Online: 2014-06-02

Published in Print: 1976-12-01


Citation Information: Zeitschrift für Naturforschung A, Volume 31, Issue 12, Pages 1630–1637, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1976-1226.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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