Neutron spectroscopic evidence for cluster formation and percolative superconductivity in ErBa2Cu3Ox

J. Mesot; P. Allenspach; U. Staub; A. Furrer; H. Mutka

doi:10.1103/PhysRevLett.70.865

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Neutron spectroscopic evidence for cluster formation and percolative superconductivity in ErBa2Cu3Ox

J. Mesot, P. Allenspach, U. Staub, A. Furrer, H. Mutka

DOI 10.1103/PhysRevLett.70.865 · Physical Review Letters

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Abstract

Inelastic neutron scattering has been employed to study in detail the low-energy crystal-field excitations of Er3+ in ErBa2Cu3Ox (6<x<7). The observed energy spectra are found to be the result of a superposition of three stable states, which we interpret in terms of local regions of semiconducting and metallic character. The superconductivity is shown to result from the formation of a two-dimensional percolative network. A two-dimensional bond percolation model correctly predicts the critical oxygen contents associated with the two-plateau structure of Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
ErBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
ErBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60	Pressure not reported	unknown
La2-xSrxCuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown