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S.E. Barrett, D.J. Durand, C.H. Pennington, C.P. Slichter, et al., "63Cu Knight shifts in the superconducting state of YBa2Cu3O7-d (Tc=90 K)," Physical Review B, 41:6283-96, 1990. Sean Barrett, C.P. Slichter, J.P. Rice, D.M. Ginsberg (University of Illinois, Urbana): "The nature of the superconducting state in the high-temperature superconductors is currently the focus of much research in condensed-matter physics. A basic question is whether or not these new materials can be described by some

The Scientist Staff
Jul 7, 1991

S.E. Barrett, D.J. Durand, C.H. Pennington, C.P. Slichter, et al., "63Cu Knight shifts in the superconducting state of YBa2Cu3O7-d (Tc=90 K)," Physical Review B, 41:6283-96, 1990.

Sean Barrett, C.P. Slichter, J.P. Rice, D.M. Ginsberg (University of Illinois, Urbana): "The nature of the superconducting state in the high-temperature superconductors is currently the focus of much research in condensed-matter physics. A basic question is whether or not these new materials can be described by some variant of the Bardeen-Cooper-Schrieffer (BCS) theory, which explains conventional superconductivity. We measured the so-called Knight shifts of the copper nuclei in YBa2Cu3O7 using nuclear magnetic resonance (NMR) to help answer this question.

"The Knight shift in a metal is the substantial increase of the resonance frequency of a nucleus, relative to its frequency in an insulator. This shift is due to the additional magnetic field seen by the nuclei as a result of the spin paramagnetism of...

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