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Phys. Rev. B 53, 5907–5914 (1996)

63Cu(2) nuclear quadrupole and nuclear magnetic resonance studies of YBa2Cu4O8 in the normal and superconducting states

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R. L. Corey*, N. J. Curro, K. O'Hara, T. Imai†, and C. P. Slichter‡
Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801

K. Yoshimura, M. Katoh, and K. Kosuge
Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan

Received 6 September 1995; published in the issue dated 1 March 1996

We report nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) measurements of the spin lattice and Gaussian spin-spin relaxation times, T1 and T2G, respectively, in an unaligned (NQR) and aligned (NMR) powder of YBa2Cu4O8. Experimental details, critical for accurate NQR measurements in this system, are discussed. The normal-state data are analyzed using several models. Evidence for the existence of a spin gap is presented. The normal-state data agree well with an analysis using scaling theory predictions for z=1 quantum critical and quantum disordered regimes. The superconducting state data agree with recent calculations for d-wave superconductivity.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.53.5907
DOI:
10.1103/PhysRevB.53.5907
PACS:

*Present address: Department of Physics, S. Dakota School of Mines, Rapid City, SD 57701.

†Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139.

‡Also at: Department of Chemistry, UIUC, Urbana, Illinois 61801.

 
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