Physics – Condensed Matter – Superconductivity
Scientific paper
2009-11-09
J. Phys. Chem. Lett. 1 (2010) 1290-1295
Physics
Condensed Matter
Superconductivity
12 pages (5 pages main text + 7 pages supplement). Replaced due to added STM theory. http://pubs.acs.org/doi/abs/10.1021/jz100
Scientific paper
10.1021/jz100265k
We report that four properties of cuprates and their evolution with doping are consequences of simply counting four-site plaquettes arising from doping: (1) the universal Tc phase diagram (superconductivity between \approx0.05 and \approx0.27 doping per CuO2 plane, and optimal Tc at \approx0.16), (2) the universal doping dependence of the room-temperature thermopower, (3) the superconducting neutron spin resonance peak (the "41 meV peak"), and (4) the dispersionless scanning tunneling conductance incommensurability. Properties (1), (3), and (4) are explained with no adjustable parameters, and (2) is explained with exactly one. The successful quantitative interpretation of four very distinct aspects of cuprate phenomenology by a simple counting rule provides strong evidence for four-site plaquette percolation in these materials. This suggests that inhomogeneity, percolation, and plaquettes play an essential role in cuprates. This geometric analysis may provide a useful guide to search for new compositions and structures with improved superconducting properties.
Goddard III William A.
Tahir-Kheli Jamil
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