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; J. Mizuki

doi:10.1103/PhysRevB.92.235110

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, J. Mizuki

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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 CeCoIn5, and moderate for CeIr(In0.925Cd0.075)5. We found no abrupt change of the Ce valence in the Kondo regime for CeIr(In0.925Cd0.075)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.

Original language	English
Article number	235110
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevB.92.235110
Publication status	Published - Dec 7 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.92.235110

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Yamaoka, H., Yamamoto, Y., Schwier, E. F., Honda, F., Zekko, Y., Ohta, Y., Lin, J. F., Nakatake, M., Iwasawa, H., Arita, M., Shimada, K., Hiraoka, N., Ishii, H., Tsuei, K. D., & Mizuki, J. (2015). Pressure and temperature dependence of the Ce valence and c-f hybridization gap in CeTIn5 (T=Co,Rh,Ir) heavy-fermion superconductors. Physical Review B - Condensed Matter and Materials Physics, 92(23), Article 235110. https://doi.org/10.1103/PhysRevB.92.235110

Yamaoka, H, Yamamoto, Y, Schwier, EF, Honda, F, Zekko, Y, Ohta, Y, Lin, JF, Nakatake, M, Iwasawa, H, Arita, M, Shimada, K, Hiraoka, N, Ishii, H, Tsuei, KD & Mizuki, J 2015, 'Pressure and temperature dependence of the Ce valence and c-f hybridization gap in CeTIn5 (T=Co,Rh,Ir) heavy-fermion superconductors', Physical Review B - Condensed Matter and Materials Physics, vol. 92, no. 23, 235110. https://doi.org/10.1103/PhysRevB.92.235110

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

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 CeCoIn5, and moderate for CeIr(In0.925Cd0.075)5. We found no abrupt change of the Ce valence in the Kondo regime for CeIr(In0.925Cd0.075)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.",

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

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doi = "10.1103/PhysRevB.92.235110",

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T1 - Pressure and temperature dependence of the Ce valence and c-f hybridization gap in CeTIn5 (T=Co,Rh,Ir) heavy-fermion superconductors

AU - Yamaoka, H.

AU - Yamamoto, Y.

AU - Schwier, E. F.

AU - Honda, F.

AU - Zekko, Y.

AU - Ohta, Y.

AU - Lin, J. F.

AU - Nakatake, M.

AU - Iwasawa, H.

AU - Arita, M.

AU - Shimada, K.

AU - Hiraoka, N.

AU - Ishii, H.

AU - Tsuei, K. D.

AU - Mizuki, J.

PY - 2015/12/7

Y1 - 2015/12/7

N2 - 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 CeCoIn5, and moderate for CeIr(In0.925Cd0.075)5. We found no abrupt change of the Ce valence in the Kondo regime for CeIr(In0.925Cd0.075)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.

AB - 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 CeCoIn5, and moderate for CeIr(In0.925Cd0.075)5. We found no abrupt change of the Ce valence in the Kondo regime for CeIr(In0.925Cd0.075)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.

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

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