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Title: Pressure dependence of Ce valence in CeRhIn 5

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. In conclusion, 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.

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [3];  [3];  [2];  [4];  [2]
  1. Univ. of California, Davis, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of California, Davis, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1415561
Report Number(s):
LLNL-JRNL-691879
Journal ID: ISSN 0953-8984
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 30; Journal Issue: 3; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; heavy-fermion; superconductivity; x-ray spectroscopy

Citation Formats

Brubaker, Z. E., Stillwell, R. L., Chow, P., Xiao, Y., Kenney-Benson, C., Ferry, R., Jenei, Z., Zieve, R. J., and Jeffries, J. R.. Pressure dependence of Ce valence in CeRhIn5. United States: N. p., 2017. Web. doi:10.1088/1361-648X/aa9e2b.
Brubaker, Z. E., Stillwell, R. L., Chow, P., Xiao, Y., Kenney-Benson, C., Ferry, R., Jenei, Z., Zieve, R. J., & Jeffries, J. R.. Pressure dependence of Ce valence in CeRhIn5. United States. doi:10.1088/1361-648X/aa9e2b.
Brubaker, Z. E., Stillwell, R. L., Chow, P., Xiao, Y., Kenney-Benson, C., Ferry, R., Jenei, Z., Zieve, R. J., and Jeffries, J. R.. 2017. "Pressure dependence of Ce valence in CeRhIn5". United States. doi:10.1088/1361-648X/aa9e2b.
@article{osti_1415561,
title = {Pressure dependence of Ce valence in CeRhIn5},
author = {Brubaker, Z. E. and Stillwell, R. L. and Chow, P. and Xiao, Y. and Kenney-Benson, C. and Ferry, R. and Jenei, Z. and Zieve, R. J. and Jeffries, J. R.},
abstractNote = {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. In conclusion, 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.},
doi = {10.1088/1361-648X/aa9e2b},
journal = {Journal of Physics. Condensed Matter},
number = 3,
volume = 30,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
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  • We report {sup 115}In nuclear-quadrupole-resonance (NQR) measurements of the pressure (P)-induced superconductor CeRhIn{sub 5} in the antiferromagnetic (AF) and superconducting (SC) states. In the AF region, the internal field H{sub int} at the In site is substantially reduced from H{sub int}=1.75kOe at P=0 to 0.39 kOe at P=1.23GPa, while the Neel temperature slightly changes with increasing P. This suggests that either the size in the ordered moment M{sub Q}(P) or the angle {theta}(P) between the direction of M{sub Q}(P) and the tetragonal c axis is extrapolated to zero at P{sup *}=1.6{+-}0.1GPa at which a bulk SC transition is no longermore » emergent. In the SC state at P=2.1GPa, the nuclear spin-lattice relaxation rate {sup 115}(1/T{sub 1}) has revealed a T{sup 3} dependence without the coherence peak just below T{sub c}, giving evidence for the unconventional superconductivity. The dimensionality of the magnetic fluctuations in the normal state is also discussed.« less
  • CeRhIn{sub 5} is a new heavy-electron material that crystallizes in a quasi-2D structure that can be viewed as alternating layers of CeIn{sub 3} and RhIn{sub 2} stacked sequentially along the tetragonal c axis. Application of hydrostatic pressure induces a first-order-like transition from an unconventional antiferromagnetic state to a superconducting state with T{sub c}=2.1 K . (c) 2000 The American Physical Society.
  • Magnetization, resistivity, thermal expansion coefficient, and x-ray unit-cell measurements of Yb/sub 0.4/In/sub 0.6/Cu/sub 2/ under pressure (P up to 25 kbar) and in magnetic fields (H/sub ext/ up to 180 kOe) at temperatures 4.2--80 K have been performed. The valence-phase-transition temperature, T/sub v/, is pressure dependent and surprisingly enough also field dependent. One obtains dT/sub v//dP = -2.1 K/kbar for P<6 kbar. Negative chemical pressure obtained by substituting Yb by La or Cu by Ag increases T/sub v/. A theoretical analysis within a previously published model shows that the interconfigurational excitation energy below T/sub v/ changes with pressure at amore » rate dE/sub 0//dP = -11 K/kbar. The external magnetic field does not affect E/sub 0/, but it increases the Yb/sup 3+/ excited-state population and thus drives the phase transition to a lower temperature at a rate dT/sub v//dH/sub ext/ = -0.022 K/kOe.« less
  • The effects of pressure on the resonance Raman spectra of the mixed-valence semiconductors K{sub 4}(Pt{sub 2}(P{sub 2}O{sub 5}H{sub 2}){sub 4}X){center dot}3H{sub 2}O, X = Cl, Br (Pt{sub 2}X), have been investigated. The related complexes K{sub 4}(Pt{sub 2}(P{sub 2}O{sub 5}H{sub 2}){sub 4}X{sub 2}){center dot}2H{sub 2}O, X = Cl, Br (Pt{sub 2}X{sub 2}), and ((Bu){sub 4}N){sub 4}(Pt{sub 2}(P{sub 2}O{sub 5}H{sub 2}){sub 4}) (Pt{sub 2}) have also been studied so that direct comparisons with the monohalides could be made. Reduction in the intensity of the Pt-Br and a Pt-Pt stretch in the delocalized form of Pt{sub 2}Br provide evidence for a pressure-induced structuralmore » change from a distorted ground state toward a symmetric structure in which the halogen is centrally located between adjacent Pt dimers. No significant intensity changes were observed in the trapped valence Pt{sub 2}Br or in Pt{sub 2}Cl, indicating that these complexes remain strongly trapped valence to 5.0 and 10.0 GPa, respectively.« less