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Phys. Rev. Lett. 101, 127401 (2008) [4 pages]

Pressure-Induced Valence Anomaly in TmTe Probed by Resonant Inelastic X-Ray Scattering

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I. Jarrige1,*, J.-P. Rueff2,3, S. R. Shieh4, M. Taguchi5, Y. Ohishi6, T. Matsumura7, C.-P. Wang8, H. Ishii1, N. Hiraoka1, and Y. Q. Cai1,†
1National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
2Synchrotron SOLEIL, L’Orme des Merisiers, BP 48 Saint-Aubin, 91192 Gif sur Yvette, France
3Laboratoire de Chimie Physique - Matière et Rayonnement, Université Pierre et Marie Curie, CNRS, 11 rue Pierre et Marie Curie, 75005 Paris, France
4Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7, Canada
5Excitation Order Research Team, RIKEN SPring-8 Center, Sayo, Sayo, Hyogo 679-5148, Japan
6JASRI, Japan Synchrotron Radiation Research Institute, 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
7Department of Physics, Tohoku University, Sendai 980-8578, Japan
8Department of Earth Sciences, National Cheng Kung University, Tainan 701, Taiwan

Received 8 February 2007; revised 9 December 2007; published 16 September 2008

The pressure-induced valence transition in TmTe was investigated by resonant inelastic x-ray scattering at the Tm L3 edge, a powerful probe of the rare-earth valent state. The data are analyzed within the Anderson impurity model which yields key parameters such as the Tm 4f-5d hybridization. In addition to the general tendency of the f electrons towards delocalization, we find a plateau in both the Tm valence and hybridization pressure dependences between 4.3 and 6.5 GPa which is interpreted in terms of an n-channel Kondo (NCK) screening process. This behavior is at odds with the usually continuous, single-channel Kondo-like f delocalization while being supported by the seminal calculations of the NCK temperature in Tm ion by Saso et al. Our study raises the interesting possibility that an NCK effect realized in a compressed mixed-valent f system could impede the concomitant electron delocalization.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.127401
DOI:
10.1103/PhysRevLett.101.127401
PACS:
78.70.Ck, 71.20.Eh, 74.62.Fj, 75.20.Hr

*jarrige@spring8.or.jp

Present address: Synchrotron Radiation Research Unit, Japan Atomic Energy Agency, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan.

†cai@bnl.gov

Present address: National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.

 
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