Electronic properties of YBa2Cu4O8 and Y2Ba4Cu7O15 as probed by NMR/NQR |
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Authors: | D. Brinkmann |
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Affiliation: | 1. Physik-Institut, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland
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Abstract: | Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) allow the investigation of electronic properties at the atomic level. We will report on such studies in typical members of the Y-Ba-Cu-O family of high-temperature superconductors, namely YBa2Cu4O8 and Y2Ba4Cu7O15. We will deal with temperature and orientational dependences of Cu and O Knight shifts and spin-lattice relaxation. Topics to be discussed are: (1) Existence of a common electronic spin-susceptibility (a single-spin fluid) in the planes and in the chains of YBa2Cu4O8. (2) Evidence for the existence of a pseudo spin-gap in the anti-ferromagnetic fluctuations in YBa2Cu4O8 and Y2Ba4Cu7O15. (3) Evidence for non-s symmetry of the pair wave function in YBa2Cu4O8. (4) First NQR observation of a strong coupling of inequivalent Cu-O planes in Y2Ba4Cu7O15. (5) Alternative explanations of relaxation and Knight shift. |
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