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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)
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.

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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);

Last Updated on Thursday, 09 May 2019 12:13