https://doi.org/10.1007/PL00011077
Appearance of anisotropic non s-wave superconductivity above the critical pressure of antiferromagnetic CeRhIn5
115In nuclear quadrupole resonance study
Department of Material Science, Faculty of Science, Himeji Institute of Technology,
Kamigori-cho Ako-gun Hyogo 678-1297, Japan
Corresponding author: a kohori@sci.himeji-tech.ac.jp
Received:
5
July
2000
Published online: 15 December 2000
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 Tc 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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
