Magnetic Dynamics in Underdoped YBCO: Direct Observation of a Superconducting Gap

Details Magnetic Dynamics in Underdoped YBCO: Direct Observation of a Superconducting Gap Magnetic Dynamics in Underdoped YBCO: Direct Observation of a Superconducting Gap

1996-11-15

arxiv.org/abs/cond-mat/9611123v1

Physics

Condensed Matter

Superconductivity

12 pages, 4 Postscript figures, Physical Review Letters, to be published

Scientific paper

10.1103/PhysRevLett.77.5425

Polarized and unpolarized triple-axis spectrometry has been used to study an underdoped YBa_2Cu3O6.6. Our results indicate that spin excitations in the superconducting state are essentially the same as those in the fully doped material except that the unusual 41 meV resonance is observed at 34.8 meV. The normal state spin excitations are characterized by a weakly energy-dependent continuum whose temperature dependence shows the clear signature of a superconducting gap at Tc. The enhancement at the resonance is accompanied by a suppression of magnetic fluctuations at both higher and lower energies.

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