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Inhomogeneity of charge-density-wave order and quenched disorder in a high-Tc superconductor

The hk diffraction pattern shows that resolution-limited streaks connect the Bragg peaks, owing to the formation of Oi stripes in the HgOy spacer layers.

G.Campi et al., Nature 525, 359–362 (2015)
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It has recently been established that the high-transition-temperature (high-Tc) superconducting state coexists with short-range charge-density-wave order and quenched disorder arising from dopants and strain. This complex, multiscale phase separation, invites the development of theories of high-temperature superconductivity that include complexity. The nature of the spatial interplay between charge and dopant order that provides a basis for nanoscale phase separation remains a key open question, because experiments have yet to probe the unknown spatial distribution at both the nanoscale and mesoscale (between atomic and macroscopic scale).
Here we report micro X-ray diffraction imaging of the spatial distribution of both short-range charge-density-wave ‘puddles’ (domains with only a few wavelengths)

 and quenched disorder in HgBa2CuO4 + y, the single-layer cuprate with the highest Tc, 95 kelvin.

Retrieve Article

Inhomogeneity of charge-density-wave order and quenched disorder in a high-Tc superconductor;
G. Campi, A. Bianconi, N. Poccia, G. Bianconi, L. Barba, G. Arrighetti, D. Innocenti, J. Karpinski, N. D. Zhigadlo, S. M. Kazakov, M. Burghammer, M. v. Zimmermann, M. Sprung, A. Ricci,
Nature 525, 359–362 (2015);
doi:10.1038/nature14987

Last Updated on Thursday, 09 May 2019 12:13