Abstract
We have studied the Ce valence as a function of pressure in CeRhIn5 at 300 K and at 22 K using x-ray absorption spectroscopy in partial fluorescent yield mode. At room temperature, we found no detectable change in Ce valence greater than 0.01 up to a pressure of 5.5 GPa. At 22 K, the valence remains robust against pressure below 6 GPa, in contrast to the predicted valence crossover at P = 2.35 GPa. This work yields an upper limit for the change in Ce-valence and suggests that the critical valence fluctuation scenario, in its current form, is unlikely.
Original language | English |
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Article number | 035601 |
Journal | Journal of Physics Condensed Matter |
Volume | 30 |
Issue number | 3 |
DOIs | |
State | Published - Jan 24 2018 |
Externally published | Yes |
Funding
The authors thank Per Soderlind for fruitful discussion. This work was performed under LDRD (Tracking Code 14-ERD-041) and under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52-07NA27344. Part of the funding was provided through the LLNL Livermore Graduate Scholar Program. Portions of this work were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operation is supported by DOE-NNSA under Award No. DE-NA0001974, with partial instrumentation funding by NSF. The Advanced Photon Source is a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. PC, YX, RF and CK-B acknowledge the support of DOE-BES/ DMSE under Award DE-FG02-99ER45775. This material is based upon work supported by the NSF under Grant Number NSF DMR-1609855. This work was performed under LDRD (Tracking Code 14-ERD-041) and under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52- 07NA27344. Part of the funding was provided through the LLNL Livermore Graduate Scholar Program. Portions of this work were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operation is supported by DOE-NNSA under Award No. DE-NA0001974, with partial instrumentation funding by NSF. The Advanced Photon Source is a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. PC, YX, RF and CK-B acknowledge the support of DOE-BES/DMSE under Award DE-FG02-99ER45775. This material is based upon work supported by the NSF under Grant Number NSF DMR-1609855.
Keywords
- heavy-fermion
- superconductivity
- x-ray spectroscopy