Characterization of High Temperature Superconductors with Raman Spectroscopy

1991 ◽  
pp. 59-99 ◽  
Author(s):  
Eric Faulques ◽  
Richard E. Russo
Keyword(s):  
Raman Spectroscopy ◽  
High Temperature ◽  
High Temperature Superconductors

scholarly journals Fabrication of Superconducting Nanowires Using the Template Method

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1970
Author(s):  
Michael Rudolf Koblischka ◽  
Anjela Koblischka-Veneva
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Sol Gel ◽  
Template Method ◽  
Aao Template ◽  
Superconducting Nanowires ◽  
Research Directions ◽  
Templating Method ◽  
Fabrication And Characterization

The fabrication and characterization of superconducting nanowires fabricated by the anodic aluminium oxide (AAO) template technique has been reviewed. This templating method was applied to conventional metallic superconductors, as well as to several high-temperature superconductors (HTSc). For filling the templates with superconducting material, several different techniques have been applied in the literature, including electrodeposition, sol-gel techniques, sputtering, and melting. Here, we discuss the various superconducting materials employed and the results obtained. The arising problems in the fabrication process and the difficulties concerning the separation of the nanowires from the templates are pointed out in detail. Furthermore, we compare HTSc nanowires prepared by AAO templating and electrospinning with each other, and give an outlook to further research directions.

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.

Growth and Characterization of HTSc Nanowires and Nanoribbons

2017 ◽  
Author(s):  
M.R. Koblischka
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Building Blocks ◽  
Film Material ◽  
Electric Transport ◽  
Superconducting Nanowires ◽  
Superconducting Cuprates ◽  
High Temperature Superconducting ◽  
Transport Measurements

This article describes the fabrication of high-temperature superconducting nanowires and their characterization by magnetic and electric transport measurements. In the literature, nanowires of high-temperature superconductors (HTSc) are obtained by means of lithography, using thin film material as a base. However, there are two main problems with this approach: first, the substrate often influences the HTSc nanowire, and second, only electric transport measurements can be performed. This article explains how nanowires and nanobelts of high-temperature superconducting cuprates can be prepared by the template method and by electrospinning. It also considers the possibilities for employing substrate-free HTSc nanowires as building blocks to realize new, nanoporous bulk superconducting materials for a variety of applications.

Characterization of the ceramic: Substrate interface of plasma sprayed high-temperature superconductors

1989 ◽  
Author(s):  
A. S. Byrne ◽  
W. F. Stickle ◽  
C. Y. Yang ◽  
T. Asano ◽  
M. M. Rahman
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Ceramic Substrate ◽  
Substrate Interface ◽  
Plasma Sprayed
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