Pressure and temperature dependence of the Ce valence and $c\text{\ensuremath{-}}f$ hybridization gap in $\mathrm{Ce}T{\mathrm{In}}_{5}\phantom{\rule{0.28em}{0ex}}(T=\mathrm{Co},\mathrm{Rh},\mathrm{Ir})$ heavy-fermion superconductors

Pressure and temperature dependence of the Ce valence and $c − f$ hybridization gap in $Ce T {In}_{5} (T = Co, Rh, Ir)$ heavy-fermion superconductors

H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki

Phys. Rev. B 92, 235110 – Published 7 December 2015

Abstract

Pressure- and temperature-induced changes in the Ce valence and $c - f$ hybridization of the Ce115 superconductors have been studied systematically. Resonant x-ray-emission spectroscopy indicated that the increase of the Ce valence with pressure was significant for ${CeCoIn}_{5}$ , and moderate for $CeIr {({In}_{0.925} {Cd}_{0.075})}_{5}$ . We found no abrupt change of the Ce valence in the Kondo regime for $CeIr {({In}_{0.925} {Cd}_{0.075})}_{5}$ , which suggests that valence fluctuations are unlikely to mediate the superconductivity in this material. X-ray-diffraction results were consistent with the pressure-induced change in the Ce valence. High-resolution photoelectron spectroscopy revealed a temperature-dependent reduction of the spectral intensity at the Fermi level, indicating enhanced $c - f$ hybridization on cooling.

Received 3 September 2015
Corrected 17 December 2015

DOI:https://doi.org/10.1103/PhysRevB.92.235110

Corrections

17 December 2015

Erratum

Publisher's Note: Pressure and temperature dependence of the Ce valence and $c - f$ hybridization gap in $Ce T {In}_{5} (T = Co, Rh, Ir)$ heavy-fermion superconductors [Phys. Rev. B 92, 235110 (2015)]

H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki

Phys. Rev. B 92, 239906 (2015)

Authors & Affiliations

H. Yamaoka^1,*, Y. Yamamoto², E. F. Schwier³, F. Honda⁴, Y. Zekko^2,†, Y. Ohta^2,‡, J.-F. Lin^5,6, M. Nakatake^3,§, H. Iwasawa³, M. Arita³, K. Shimada³, N. Hiraoka⁷, H. Ishii⁷, K.-D. Tsuei⁷, and J. Mizuki²

¹RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
²Graduate School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
³Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
⁴Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
⁵Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, USA
⁶Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
⁷National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, Republic of China

^*Author to whom all correspondence should be addressed: yamaoka@spring8.or.jp
^†Present address: Yokohama R & D Center, Nissin Incorporated, 1-18-2 Hakusan, Midori-ku, Yokohama 226-0006, Japan.
^‡Present address: Department of Physics, Osaka University, 1-3 Yamadaoka, Suita 565-0871, Japan.
^§Present address: Aichi Synchrotron Radiation Center, Seto, Aichi 489-0965, Japan.

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Vol. 92, Iss. 23 — 15 December 2015

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Physical Review B

covering condensed matter and materials physics

Pressure and temperature dependence of the Ce valence and $c − f$ hybridization gap in $Ce T {In}_{5} (T = Co, Rh, Ir)$ heavy-fermion superconductors

H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki

Phys. Rev. B 92, 235110 – Published 7 December 2015

Abstract

Corrections

Erratum

Publisher's Note: Pressure and temperature dependence of the Ce valence and $c - f$ hybridization gap in $Ce T {In}_{5} (T = Co, Rh, Ir)$ heavy-fermion superconductors [Phys. Rev. B 92, 235110 (2015)]

H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki

Phys. Rev. B 92, 239906 (2015)

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Physical Review B

covering condensed matter and materials physics

Pressure and temperature dependence of the Ce valence and c−f hybridization gap in CeTIn5(T=Co,Rh,Ir) heavy-fermion superconductors

H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki

Phys. Rev. B 92, 235110 – Published 7 December 2015

Abstract

Corrections

Erratum

Publisher's Note: Pressure and temperature dependence of the Ce valence and c−f hybridization gap in CeTIn5(T=Co,Rh,Ir) heavy-fermion superconductors [Phys. Rev. B 92, 235110 (2015)]

H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki

Phys. Rev. B 92, 239906 (2015)

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Pressure and temperature dependence of the Ce valence and $c − f$ hybridization gap in $Ce T {In}_{5} (T = Co, Rh, Ir)$ heavy-fermion superconductors

Publisher's Note: Pressure and temperature dependence of the Ce valence and $c - f$ hybridization gap in $Ce T {In}_{5} (T = Co, Rh, Ir)$ heavy-fermion superconductors [Phys. Rev. B 92, 235110 (2015)]