Cu63(2) nuclear quadrupole and nuclear magnetic resonance studies of YBa2Cu4O8 in the normal and superconducting states
R. L. Corey, N. J. Curro, K. O'Hara, T. Imai, C. P. Slichter, K. Yoshimura, M. Katoh, K. Kosuge
DOI 10.1103/PhysRevB.53.5907 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 81 | Pressure unresolved | unknown |
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