McDonald RD, Harrison N, Singleton J. Exact mapping of the d(x(2)-y(2)) Cooper-pair wavefunction onto the spin fluctuations in cuprates: the Fermi surface as a driver for 'high T(c)' superconductivity.
JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009;
21:012201. [PMID:
21817202 DOI:
10.1088/0953-8984/21/1/012201]
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Abstract
We propose that the extraordinarily high superconducting transition temperatures in the cuprates are driven by an exact mapping of the d(x(2)-y(2)) Cooper-pair wavefunction onto the incommensurate spin fluctuations observed in neutron-scattering experiments. This is manifested in the direct correspondence between the inverse of the incommensurability factor δ seen in inelastic neutron-scattering experiments and the measured superconducting coherence length ξ(0). Strikingly, the relationship between ξ(0) and δ is valid for both La(2-x)Sr(x)CuO(4) and YBa(2)Cu(3)O(7-x), suggesting a common mechanism for superconductivity across the entire hole-doped cuprate family. Using data from recent quantum-oscillation experiments in the cuprates, we propose that the fluctuations responsible for superconductivity are driven by a Fermi-surface instability. On the basis of these findings, one can specify the optimal characteristics of a solid that will exhibit 'high T(c)' superconductivity.
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