Valence transitions in the heavy-fermion compound YbCuAl as a function of temperature and pressure

Yamaoka, Hitoshi; Tsujii, Naohito; Utsumi, Yuki; Sato, Hitoshi; Jarrige, Ignace; Yamamoto, Yoshiya; Lin, Jung-Fu; Hiraoka, Nozomu; Ishii, Hirofumi; Tsuei, Ku-Ding; Mizuki, Jun'ichiro

doi:10.1103/PhysRevB.87.205120

Valence transitions in the heavy-fermion compound YbCuAl as a function of temperature and pressure

Journal Article · Wed May 01 04:00:00 EDT 2013 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.87.205120· OSTI ID:1382300

Yamaoka, Hitoshi; Tsujii, Naohito; Utsumi, Yuki; Sato, Hitoshi; Jarrige, Ignace; Yamamoto, Yoshiya; Lin, Jung-Fu; Hiraoka, Nozomu; Ishii, Hirofumi; Tsuei, Ku-Ding; Mizuki, Jun'ichiro

We report on direct measurements of the Yb valence in the heavy Fermion compound YbCuAl as a function of temperature and pressure using resonant x-ray emission spectroscopy. The increase of the Yb 2 + component at T < 100 K and ambient pressure, well described by the single impurity Anderson model, is found to compensate for the thermal contraction of the unit cell volume. Under pressure, the Yb valence increases continuously up to 25 GPa, albeit a marked leveling off close to the critical pressure, at P ≥ 13 GPa. This finding is reminiscent of a recent report on YbCu 2 Si 2 and further confirms the interplay between electronic and magnetic fluctuations near the magnetic instability point of rare-earth intermediate-valence materials.

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:: 1382300

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 20 Vol. 87; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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