Conduction-band electronic states of YbInCu{sub 4} studied by photoemission and soft x-ray absorption spectroscopies

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.84.115143· OSTI ID:21596871

Utsumi, Yuki; Kurihara, Hidenao; Maso, Hiroyuki; Tobimatsu, Komei ^[1]; Sato, Hitoshi; Shimada, Kenya; Namatame, Hirofumi ^[2]; Hiraoka, Koichi ^[3]; Kojima, Kenichi ^[4]; Ohkochi, Takuo; Fujimori, Shin-ichi; Takeda, Yukiharu; Saitoh, Yuji ^[5]; Mimura, Kojiro ^[6]; Ueda, Shigenori; Yamashita, Yoshiyuki; Yoshikawa, Hideki; Kobayashi, Keisuke ^[7]; Oguchi, Tamio ^[8]; Taniguchi, Masaki ^[1]

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1. Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526 (Japan)
2. Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046 (Japan)
3. Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577 (Japan)
4. Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521 (Japan)
5. Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148 (Japan)
6. Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531 (Japan)
7. NIMS Beamline Station at SPring-8, National Institute for Materials Science, Hyogo 679-5148 (Japan)
8. ISIR, Osaka University, Ibaraki 567-0047 (Japan)

We have studied conduction-band (CB) electronic states of a typical valence-transition compound YbInCu{sub 4} by means of temperature-dependent hard x-ray photoemission spectroscopy (HX-PES) of the Cu 2p{sub 3/2} and In 3d{sub 5/2} core states taken at h{nu}=5.95 keV, soft x-ray absorption spectroscopy (XAS) of the Cu 2p{sub 3/2} core absorption region around h{nu}{approx}935 eV, and soft x-ray photoemission spectroscopy (SX-PES) of the valence band at the Cu 2p{sub 3/2} absorption edge of h{nu}=933.0 eV. With decreasing temperature below the valence transition at T{sub V}=42 K, we have found that (1) the Cu 2p{sub 3/2} and In 3d{sub 5/2} peaks in the HX-PES spectra exhibit the energy shift toward the lower binding-energy side by {approx}40 and {approx}30 meV, respectively, (2) an energy position of the Cu 2p{sub 3/2} main absorption peak in the XAS spectrum is shifted toward higher photon-energy side by {approx}100 meV, with an appearance of a shoulder structure below the Cu 2p{sub 3/2} main absorption peak, and (3) an intensity of the Cu L{sub 3}VV Auger spectrum is abruptly enhanced. These experimental results suggest that the Fermi level of the CB-derived density of states is shifted toward the lower binding-energy side. We have described the valence transition in YbInCu{sub 4} in terms of the charge transfer from the CB to Yb 4f states.

• OSTI ID: 21596871
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 11 Vol. 84; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ABSORPTION SPECTROSCOPY
AUGER ELECTRON SPECTROSCOPY
BINDING ENERGY
BOSONS
COPPER COMPOUNDS
DENSITY
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTARY PARTICLES
EMISSION
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FERMI LEVEL
HARD X RADIATION
INDIUM COMPOUNDS
IONIZING RADIATIONS
MASSLESS PARTICLES
PHOTOEMISSION
PHOTONS
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
SECONDARY EMISSION
SOFT X RADIATION
SORPTION
SPECTRA
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
X RADIATION
X-RAY SPECTROSCOPY
YTTERBIUM COMPOUNDS