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Probing Phase Separation and Local Lattice Distortions in Cuprates by Raman Spectroscopy

Department of Physics, National Technical University of Athens, 15780 Athens, Greece
Condens. Matter 2019, 4(4), 87; https://doi.org/10.3390/condmat4040087
Received: 25 September 2019 / Revised: 21 October 2019 / Accepted: 27 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue From cuprates to Room Temperature Superconductors)
It is generally accepted that high temperature superconductors emerge when extra carriers are introduced in the parent state, which looks like a Mott insulator. Competition of the order parameters drives the system into a poorly defined pseudogap state before acquiring the normal Fermi liquid behavior with further doping. Within the low doping level, the system has the tendency for mesoscopic phase separation, which seems to be a general characteristic in all high Tc compounds, but also in the materials of colossal magnetoresistance or the relaxor ferroelectrics. In all these systems, metastable phases can be created by tuning physical variables, such as doping or pressure, and the competing order parameters can drive the compound to various states. Structural instabilities are expected at critical points and Raman spectroscopy is ideal for detecting them, since it is a very sensitive technique for detecting small lattice modifications and instabilities. In this article, phase separation and lattice distortions are examined on the most characteristic family of high temperature superconductors, the cuprates. The effect of doping or atomic substitutions on cuprates is examined concerning the induced phase separation and hydrostatic pressure for activating small local lattice distortions at the edge of lattice instability. View Full-Text
Keywords: phase separation; lattice distortions; high temperature superconductors; cuprates; Raman spectroscopy phase separation; lattice distortions; high temperature superconductors; cuprates; Raman spectroscopy
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Liarokapis, E. Probing Phase Separation and Local Lattice Distortions in Cuprates by Raman Spectroscopy. Condens. Matter 2019, 4, 87.

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