Anomalous NMR magnetic shifts in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">CeCoIn</mi></mrow><mrow><mn>5</mn></mrow></msub></mrow></math></span>

N. J. Curro; B. Simovic; P. C. Hammel; P. G. Pagliuso; J. L. Sarrao; J. D. Thompson; G. B. Martins

doi:10.1103/PhysRevB.64.180514

Rapid Communication

Anomalous NMR magnetic shifts in ${CeCoIn}_{5}$

N. J. Curro, B. Simovic, P. C. Hammel, P. G. Pagliuso, J. L. Sarrao, J. D. Thompson, and G. B. Martins

Phys. Rev. B 64, 180514(R) – Published 23 October 2001

Abstract

We report $^{115} In$ and $^{59} Co$ nuclear magnetic resonance (NMR) measurements in the heavy fermion superconductor ${CeCoIn}_{5}$ above and below $T_{c} .$ The hyperfine couplings of the $^{115} In$ and $^{59} Co$ are anisotropic and exhibit dramatic changes below 50 K due to changes in the crystal field level populations of the Ce ions, suggesting localized f electrons. Below $T_{c}$ the spin susceptibility is suppressed, indicating singlet pairing.

Received 8 May 2001

DOI:https://doi.org/10.1103/PhysRevB.64.180514

Authors & Affiliations

N. J. Curro, B. Simovic, P. C. Hammel, P. G. Pagliuso, J. L. Sarrao, and J. D. Thompson

Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

G. B. Martins

National High Magnetic Field Laboratory and Florida State University, Tallahassee, Florida 32306

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Vol. 64, Iss. 18 — 1 November 2001

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