Magnetic ordering and phase separation in high-temperature superconductors

1992 ◽  
Vol 92 (2) ◽  
pp. 931-936
Author(s):  
A. N. Ermilov
Keyword(s):  
Phase Separation ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Magnetic Ordering

scholarly journals Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

2021 ◽  
Vol 6 (4) ◽  
pp. 40
Author(s):  
Gaetano Campi ◽  
Antonio Bianconi
Keyword(s):  
Phase Separation ◽  
High Temperature ◽  
Physical Properties ◽  
High Precision ◽  
High Temperature Superconductors ◽  
Complex Materials ◽  
Structural Units ◽  
X Ray ◽  
Nanoscale Phase Separation ◽  
Complex Matter

Nanoscale phase separation (NPS), characterized by particular types of correlated disorders, plays an important role in the functionality of high-temperature superconductors (HTS). Our results show that multiscale heterogeneity is an essential ingredient of quantum functionality in complex materials. Here, the interactions developing between different structural units cause dynamical spatiotemporal conformations with correlated disorder; thus, visualizing conformational landscapes is fundamental for understanding the physical properties of complex matter and requires advanced methodologies based on high-precision X-ray measurements. We discuss the connections between the dynamical correlated disorder at nanoscale and the functionality in oxygen-doped perovskite superconducting materials.

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

2019 ◽  
Vol 4 (4) ◽  
pp. 87
Author(s):  
Liarokapis
Keyword(s):  
Raman Spectroscopy ◽  
Phase Separation ◽  
High Temperature ◽  
Colossal Magnetoresistance ◽  
High Temperature Superconductors ◽  
Relaxor Ferroelectrics ◽  
Order Parameters ◽  
Characteristic Family ◽  
Local Lattice ◽  
Lattice Distortions

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.

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