Absence of temperature dependence of the valence-band spectrum of Co₂MnSi

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K. Miyamoto,¹ A. Kimura,² Y. Miura,³ M. Shirai,³ M. Ye,² Y. Cui,¹ K. Shimada,¹ H. Namatame,¹ M. Taniguchi,^1,2 Y. Takeda,⁴ Y. Saitoh,⁴ E. Ikenaga,⁵ S. Ueda,⁶ K. Kobayashi,⁶ and T. Kanomata⁷
¹Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
²Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
³Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
⁴Japan Atomic Energy Agency/SPring-8, Sayo, Hyogo 679-5198, Japan
⁵Japan Synchrotron Radiation Research Institute/SPring-8, Sayo, Hyogo 679-5198, Japan
⁶NIMS Beamline Station at SPring-8, National Institute for Materials Science, Sayo, Hyogo 679-5148, Japan
⁷Faculty of Engineering, Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan

Received 27 October 2008; revised 20 January 2009; published 23 March 2009

Valence-bandelectronic structure of Co₂MnSi has been revealed by photoelectron spectroscopyutilizing hard x-ray synchrotron radiation. We have obtained a goodcorrespondence between experimental valence-band spectra and theoretical density of statescalculated with generalized gradient aprroximation. However, no distinct temperature dependencehas been observed for the experimental valence band, which requiresreexamination of the explanation based on the dynamical mean-field theoryfor the rapid decrease in tunneling magnetoresistance ratio with increasingtemperature.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.79.100405
DOI:	10.1103/PhysRevB.79.100405
PACS:	75.50.Cc; 79.60.-i; 71.20.Lp 75.50.Cc Ferromagnetism of nonferrous metals and alloys 79.60.-i Photoemission and photoelectron spectra (condensed matter) 71.20.Lp Electronic structure of crystalline intermetallic compounds YEAR: 2009
KEYWORDS:	cobalt alloys, manganese alloys, silicon alloys, tunnelling magnetoresistance, valence bands, X-ray photoelectron spectra

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