Zeitschrift für Physik B Condensed Matter

ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)

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Abstract Volume 100 Issue 3 (1996) pp 369-380

Generalized Fulde-Ferrell-Larkin-Ovchinnikov state in heavy-fermion and intermediate-valence systems

M. Tachiki (1), S. Takahashi (1), P. Gegenwart (2), M. Weiden (2), M. Lang (2), C. Geibel (2), F. Steglich (2), R. Modler (2)(3), C. Paulsen (4), Y. \={O}nuki (5)

(1) Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980, Japan (Fax: +81-22 215 2006, Tel. +81-22-215-2005)
(2) Institut für Festkörperphysik, Technische Hochschule Darmstadt, Hochschulstrasse 8, D-64289 Darmstadt, Germany (Fax: +49-6151-16 48 83, Tel.: +49-6151-16 21 84)
(3) Forschungszentrum Karlsruhe GmbH, INFP, D-76021 Karlsruhe, Germany
(4) CRTBT, CNRS, 38042 Grenoble Cedex 9, France
(5) Department of Physics, Osaka University, Toyonaka, Osaka 560, Japan

Received: 4 July 1995

Abstract. Anomalous properties of the magnetization, the crystal dilatation, and other physical quantities observed in the mixed state of compounds such as UPd₂Al₃ and CeRu₂ suggest the occurrence of a new state near H_c2. In such compounds with large spin susceptibility and high H_c2, a new inhomogeneous superconducting state is theoretically predicted to occur in high magnetic fields. In this inhomogeneous state which is shown to be a generalized Fulde-Ferrell-Larkin-Ovchinnikov state, the order parameter is spatially modulated, and planar nodes of the order parameter are periodically aligned perpendicular to the vortices. Various theoretical predictions are compared with experimental results on UPd₂Al₃ and CeRu₂ related to this new superconducting high-field state.

PACS: 74.20.-z; 74.30.Ci; 74.60.Ge; 74.70.Tx

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