Search for anomalous internal magnetic fields in high-Tc superconductors as evidence for broken time-reversal symmetry
R. F. Kiefl, J. H. Brewer, I. Affleck, J. F. Carolan, P. Dosanjh, W. N. Hardy, T. Hsu, R. Kadono, J. R. Kempton, S. R. Kreitzman, Q. Li, A. H. O’Reilly, T. M. Riseman, P. Schleger, P. C. E. Stamp, H. Zhou, L. P. Le, G. M. Luke, B. Sternlieb, Y. J. Uemura, H. R. Hart, K. W. Lay
DOI 10.1103/PhysRevLett.64.2082 · Physical Review Letters
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Abstract
Several recent models of high-Tc superconductivity predict static internal magnetic fields along the c axis due to spontaneously broken parity and time-reversal symmetries. Muon spin relaxation has been used to study the internal fields in c-axis-oriented samples of sintered YBa2Cu3O7 and of thick-film Bi2Sr2CaCu2O8. The magnitude, anisotropy, and temperature dependence of the observed fields favor a nuclear dipolar origin. Any anomalous fields at μ+ sites in bulk CuO2 superconductors must be ≲0.08 mT.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
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