Anisotropic effect of Cd and Hg doping on the pauli limited superconductor CeCoIn5

Y. Tokiwa, R. Movshovich, F. Ronning, E. D. Bauer, P. Papin, A. D. Bianchi, J. F. Rauscher, S. M. Kauzlarich, Z. Fisk

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Abstract

We studied the effect of impurity on the first order superconducting (SC) transition and the high field-low temperature (HFLT) SC state of CeCoIn5 by measuring the specific heat of CeCo(In1-xCdx)5 with x=0.0011, 0.0022, and 0.0033 and CeCo(In1-xHgx)5 with x=0.00016, 0.00032, and 0.00048 at temperatures down to 0.1K and fields up to 14T. Cd substitution rapidly suppresses the crossover temperature T0, where the SC transition changes from second to first order, to T=0K with x=0.0022 for H[100], while it remains roughly constant up to x=0.0033 for H[001]. The associated anomaly of the proposed FFLO state in Hg-doped samples is washed out by x=0.00048, while remaining at the same temperature, indicating high sensitivity of that state to impurities. We interpret these results as supporting the nonmagnetic, possibly FFLO, origin of the HFLT state in CeCoIn5.

Original languageEnglish (US)
Article number037001
JournalPhysical Review Letters
Volume101
Issue number3
DOIs
StatePublished - Jul 16 2008

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impurities
temperature
crossovers
specific heat
substitutes
anomalies
sensitivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Tokiwa, Y., Movshovich, R., Ronning, F., Bauer, E. D., Papin, P., Bianchi, A. D., ... Fisk, Z. (2008). Anisotropic effect of Cd and Hg doping on the pauli limited superconductor CeCoIn5. Physical Review Letters, 101(3), [037001]. https://doi.org/10.1103/PhysRevLett.101.037001

Anisotropic effect of Cd and Hg doping on the pauli limited superconductor CeCoIn5. / Tokiwa, Y.; Movshovich, R.; Ronning, F.; Bauer, E. D.; Papin, P.; Bianchi, A. D.; Rauscher, J. F.; Kauzlarich, S. M.; Fisk, Z.

In: Physical Review Letters, Vol. 101, No. 3, 037001, 16.07.2008.

Research output: Contribution to journalArticle

Tokiwa, Y, Movshovich, R, Ronning, F, Bauer, ED, Papin, P, Bianchi, AD, Rauscher, JF, Kauzlarich, SM & Fisk, Z 2008, 'Anisotropic effect of Cd and Hg doping on the pauli limited superconductor CeCoIn5', Physical Review Letters, vol. 101, no. 3, 037001. https://doi.org/10.1103/PhysRevLett.101.037001
Tokiwa Y, Movshovich R, Ronning F, Bauer ED, Papin P, Bianchi AD et al. Anisotropic effect of Cd and Hg doping on the pauli limited superconductor CeCoIn5. Physical Review Letters. 2008 Jul 16;101(3). 037001. https://doi.org/10.1103/PhysRevLett.101.037001
Tokiwa, Y. ; Movshovich, R. ; Ronning, F. ; Bauer, E. D. ; Papin, P. ; Bianchi, A. D. ; Rauscher, J. F. ; Kauzlarich, S. M. ; Fisk, Z. / Anisotropic effect of Cd and Hg doping on the pauli limited superconductor CeCoIn5. In: Physical Review Letters. 2008 ; Vol. 101, No. 3.
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