Magnetic Dynamics in Underdoped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}: Direct Observation of a Superconducting Gap
Journal Article
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· Physical Review Letters
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
Polarized and unpolarized triple-axis neutron measurements were performed on an underdoped crystal of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} ({ital x}=0.4{plus_minus}0.02, {ital T}{sub {ital c}}=62.7 K). Our results indicate, contrary to earlier evidence, that the spin excitations in the superconducting state are essentially the same as those in the fully doped material except that the unusual 41meV resonance is observed at 34.8meV. 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 {ital T}{sub {ital c}}. The enhancement at the resonance is accompanied by a suppression of magnetic fluctuations at both higher and lower energies. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Oak Ridge National Laboratory
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 435243
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 27 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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