Foreword to the Special Issue on spectroscopic studies on colossal magnetoresistance, high-temperature superconductors and superlattice material

2001 ◽  
Vol 32 (10) ◽  
pp. 804-804
Author(s):  
P. X. Zhang
Keyword(s):  
High Temperature ◽  
Colossal Magnetoresistance ◽  
High Temperature Superconductors ◽  
Spectroscopic Studies ◽  
Special Issue

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.

X-ray Absorption Spectroscopic Studies of Tl-Based High Temperature Superconductors

2009 ◽  
Author(s):  
Arvind Agarwal ◽  
A. N. Vishnoi ◽  
Rogério Magalhaes Paniago
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Spectroscopic Studies ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Review of Spectroscopic Studies on High-temperature Superconductors

2011 ◽  
Vol 20 (9) ◽  
pp. 8
Author(s):  
Jungseek HWANG ◽  
Jhinhwan LEE ◽  
Changyoung KIM
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Spectroscopic Studies
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