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

1
Felix Bloch Institute for Solid State Physics, University of Leipzig, Linnéstr. 5, 04103 Leipzig, Germany
2
Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
*
Author to whom correspondence should be addressed.
Condens. Matter 2019, 4(3), 67; https://doi.org/10.3390/condmat4030067
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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