Advertisement

Appearance of anisotropic non s-wave superconductivity above the critical pressure of antiferromagnetic CeRhIn5

115In nuclear quadrupole resonance study
  • Y. Kohori
  • Y. Yamato
  • Y. Iwamoto
  • T. Kohara

Abstract:

We have carried out 115In nuclear quadrupole resonance (NQR) measurements in CeRhIn5. At ambient pressure, CeRhIn5 undergoes an antiferromagnetic AF phase transition at \(\) K. The 115In NQR spectrum has shown the appearance of a small internal field in the direction perpendicular to the tetragonal c-axis. With application of a hydrostatic pressure, the AF state is suppressed and the superconductivity appears just above the critical pressure (P = 17 kbar). The nuclear spin lattice relaxation rate 1/T1 of 115In measured at P = 27 kbar indicates the occurrence of the superconductivity in the nearly AF region. In the superconducting state, 1/T1 has no Hebel-Slichter coherence peak just below \(\) of 2 K and has a power law T-dependence (T3) down to 300 mK. This is consistent with anisotropic superconductivity, with line nodes in the superconducting energy gap: non-s-wave superconductivity occurs in CeRhIn5.

PACS. 74.20.Mn Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) - 71.27.+a Strongly correlated electron systems; heavy fermions - 76.60.Gv Quadrupole resonance 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • Y. Kohori
    • 1
  • Y. Yamato
    • 1
  • Y. Iwamoto
    • 1
  • T. Kohara
    • 1
  1. 1.Department of Material Science, Faculty of Science, Himeji Institute of Technology, Kamigori-cho Ako-gun Hyogo 678-1297, JapanJP

Personalised recommendations