Cu spin dynamics and superconducting precursor effects in planes above Tc in YBa2Cu3O6.7

W. W. Warren, Jr.; R. E. Walstedt; G. F. Brennert; R. J. Cava; R. Tycko; R. F. Bell; G. Dabbagh

doi:10.1103/PhysRevLett.62.1193

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Cu spin dynamics and superconducting precursor effects in planes above Tc in YBa2Cu3O6.7

W. W. Warren, Jr., R. E. Walstedt, G. F. Brennert, R. J. Cava, R. Tycko, R. F. Bell, G. Dabbagh

DOI 10.1103/PhysRevLett.62.1193 · Physical Review Letters

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Abstract

Spin dynamics at planar sites in oxygen-deficient YBa2Cu3O6+x have been investigated by nuclear spin-lattice relaxation measurements using 63,65Cu nuclear quadrupole resonance and Y89 NMR. A sharp decrease of Cu63 nuclear relaxation below 100 K in YBa2Cu3O6.7 suggests the possible onset of spin pairing in individual planes well above the transition to three-dimensional bulk superconductivity. Comparison of the relaxation rates for the 60-K superconductor YBa2Cu3O6.7 with those of YBa2Cu3O7.0 in the range 100–300 K shows that the planar Cu(2) spin dynamics are strongly affected by changes in carrier concentration.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	61	Pressure not reported	onset
YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	86	Pressure not reported	midpoint
YBa2Cu3O7.0 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown