Mixed valency and first order phase transition in EuPdAs |
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| Authors: | G Michels S Junk N Lossau W Schlabitz D Wohlleben D Johrendt A Mewis Ch Sauer Th Woike |
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| Institution: | (1) II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, W-5000 Köln 41, Federal Republic of Germany;(2) Institut für Anorganische Chemie, Universität zu Köln, Greinstrasse 6, W-5000 Köln 41, Federal Republic of Germany;(3) Institut für Festkörperforschung, Kernforschungszentrum, Postfach 1913, W-5170 Jülich 1, Federal Republic of Germany;(4) Institut für Kristallographie, Universität zu Köln, Zülpicher Strasse 49, W-5000 Köln 41, Federal Republic of Germany |
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| Abstract: | The intermetallic alloy EuPdAs exhibits a first order phase transition at 180 K. The transition is seen by anomalies in lattice parameters, susceptibility, resistivity, Moessbauer effect and X-ray absorption. It is accompanied by an increase of the Eu valence from 2.15 to 2.40 between 300 K and 4 K. The nature of the non-integral valence and the phase transition are discussed. |
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