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Tc and Other Cuprate Properties in Relation to Planar Charges as Measured by NMR

Felix Bloch Institute for Solid State Physics, University of Leipzig, Linnéstr. 5, 04103 Leipzig, Germany
Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
Author to whom correspondence should be addressed.
Condens. Matter 2019, 4(3), 67;
Received: 28 May 2019 / Revised: 3 July 2019 / Accepted: 9 July 2019 / Published: 11 July 2019
(This article belongs to the Special Issue From cuprates to Room Temperature Superconductors)
Nuclear magnetic resonance (NMR) in cuprate research is a prominent bulk local probe of magnetic properties. NMR also, as was shown over the last years, actually provides a quantitative measure of local charges in the CuO 2 plane. This has led to fundamental insights, e.g., that the maximum T c is determined by the sharing of the parent planar hole between Cu and O. Using bonding orbital hole contents on planar Cu and O measured by NMR, instead of the total doping x, the thus defined two-dimensional cuprate phase diagram reveals significant differences between the various cuprate materials. Even more importantly, the reflected differences in material chemistry appear to set a number of electronic properties as we discuss here, for undoped, underdoped and optimally doped cuprates. These relations should advise attempts at a theoretical understanding of cuprate physics as well as inspire material chemists towards new high- T c materials. Probing planar charges, NMR is also sensitive to charge variations or ordering phenomena in the CuO 2 plane. Thereby, local charge order on planar O in optimally doped YBCO could recently be proven. Charge density variations seen by NMR in both planar bonding orbitals with amplitudes between 1% to 5% appear to be omnipresent in the doped CuO 2 plane, i.e., not limited to underdoped cuprates and low temperatures. View Full-Text
Keywords: NMR; cuprates; charge order NMR; cuprates; charge order
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Jurkutat, M.; Erb, A.; Haase, J. Tc and Other Cuprate Properties in Relation to Planar Charges as Measured by NMR. Condens. Matter 2019, 4, 67.

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