Electronic structure of YbGa 1.15 Si 0.85 and YbGa x Ge 2-x probed by resonant x-ray emission and photoelectron spectroscopies

Yamaoka, Hitoshi; Jarrige, Ignace; Tsujii, Naohito; Imai, Motoharu; Lin, Jung-Fu; Matsunami, Masaharu; Eguchi, Ritsuko; Arita, Masashi; Shimada, Kenya; Namatame, Hirofumi; Taniguchi, Masaki; Taguchi, Munetaka; Senba, Yasunori; Ohashi, Haruhiko; Hiraoka, Nozomu; Ishii, Hirofumi; Tsuei, Ku-Ding

doi:10.1103/PhysRevB.83.104525

Electronic structure of YbGa $_{1.15}$ Si $_{0.85}$ and YbGa $_{x}$ Ge $_{2 - x}$ probed by resonant x-ray emission and photoelectron spectroscopies

Journal Article · Tue Mar 01 04:00:00 EST 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.83.104525· OSTI ID:1380587

Yamaoka, Hitoshi; Jarrige, Ignace; Tsujii, Naohito; Imai, Motoharu; Lin, Jung-Fu; Matsunami, Masaharu; Eguchi, Ritsuko; Arita, Masashi; Shimada, Kenya; Namatame, Hirofumi; Taniguchi, Masaki; Taguchi, Munetaka; Senba, Yasunori; Ohashi, Haruhiko; Hiraoka, Nozomu; Ishii, Hirofumi; Tsuei, Ku-Ding

We performed an x-ray spectroscopic study combining resonant x-ray emission spectroscopy (RXES) and photoelectron spectroscopy on the superconducting ternary silicide YbGa 1 . 15 Si 0 . 85 and nonsuperconducting ternary germanide YbGa x Ge 2 - x ( x =1.0 and 1.1). The Yb valence for all three compounds is found to be about 2.3. In YbGa 1 . 15 Si 0 . 85 no temperature dependence of the Yb valence is observed in the RXES spectra in the temperature range of 7–300 K, while the valence shows a drastic increase under pressure from the Yb 2 + state partially including itinerant electrons to the localized Yb 3 + state. Differences are observed in the valence-band spectra of the photoelectron spectroscopy between YbGa 1 . 15 Si 0 . 85 and YbGa x Ge 2 - x , which may be attributed to the difference of crystal structure. We conclude that both the crystal structure of the planar GaSi layer in YbGa 1 . 15 Si 0 . 85 and the resultant electronic structure may have a crucial role in the occurrence of superconductivity.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: SC0001057

OSTI ID:: 1380587

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 83; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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