NMR Studies of Spin Excitations in Superconducting Bi2Sr2CaCu2O8+δ Single Crystals

M. Takigawa; D. B. Mitzi

doi:10.1103/PhysRevLett.73.1287

← Back to search

NMR Studies of Spin Excitations in Superconducting Bi2Sr2CaCu2O8+δ Single Crystals

M. Takigawa, D. B. Mitzi

DOI 10.1103/PhysRevLett.73.1287 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

The oxygen NMR shift and the Cu nuclear spin-lattice relaxation rate (1T1) were measured in Bi2Sr2CaCu2O8+δ single crystals. While both the shift and 1T1T decrease sharply near Tc, 1T1T becomes nearly constant at low temperatures, indicating a gapless superconducting state with finite density of states at the Fermi level. From the oxygen shift data, the residual spin susceptibility at T=0 is estimated to be 10% of the value at room temperature. Our results are most consistent with a a-wave pairing model with strong (resonant) impurity scattering.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	onset
Bi2.1Sr1.9Ca0.9Cu2.1O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	onset
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown