Spatial inhomogeneity and planar symmetry breaking of the lattice incommensurate supermodulation in the high-temperature superconductor Bi2Sr2CaCu2O8+y
Nicola Poccia, Gaetano Campi, Michela Fratini, Alessandro Ricci, Naurang L. Saini, Antonio Bianconi
DOI 10.1103/PhysRevB.84.100504 · Physical Review B
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Abstract
Using scanning micro-x-ray diffraction we report a mixed real and reciprocal space visualization of the spatial heterogeneity of the lattice incommensurate supermodulation in a single crystal of Bi2Sr2CaCu2O8+y with Tc = 84 K. The mapping shows an amplitude distribution of the supermodulation with large lattice fluctuations at a microscale with ∼50% amplitude variation. The angular distribution of the supermodulation amplitude in the a-b plane shows a lattice chiral symmetry, forming a left-handed oriented striped pattern. The spatial correlation of the supermodulation is well described by a compressed exponential with an exponent of 1.5 ± 0.3 and a correlation length of ∼50 μm, showing intrinsic lattice disorder in high-temperature superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
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