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Special Issue "New High Tc Superconductor"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 July 2011)

Special Issue Editor

Guest Editor
Prof. Dr. Allen M. Hermann

Department of Physics, University of Colorado, Boulder, CO 80309-0390, USA
Website | E-Mail
Phone: +1 303 919-8429
Interests: high-temperature superconductivity; Tl-cuprates; nanoscience and nanotechnology; 1-d and 2-d materials; solid state batteries; non-linear dielectrics; molecular solids

Special Issue Information

Dear Colleagues,

This special issue provides an up-to-date summary of high temperature superconductors: materials, characterization, properties, and issues related to their deployment. High Tc cuprates, borides, boro-carbides, and iron pnictide are among those materials discussed. Special emphasis is given to wire applications and related high-critical-current problems and solutions. The special issue consists of papers written by experts in the field, and is edited by one of the pioneering high Tc researchers.

Prof. Dr. Allen M. Hermann
Guest Editor

Keywords

  • high Tc materials
  • critical currents, applications in high Tc materials
  • superconducting wire development
  • high Tc cuprates
  • high Tc borides and boro-carbides
  • iron pnictide
  • superconductors

Published Papers (2 papers)

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Research

Open AccessArticle Nanorod Self-Assembly in High Jc YBa2Cu3O7−x Films with Ru-Based Double Perovskites
Materials 2011, 4(11), 2042-2056; doi:10.3390/ma4112042
Received: 7 September 2011 / Revised: 24 October 2011 / Accepted: 9 November 2011 / Published: 17 November 2011
Cited by 2 | PDF Full-text (2975 KB) | HTML Full-text | XML Full-text
Abstract
Many second phase additions to YBa2Cu3O7−x (YBCO) films, in particular those that self-assemble into aligned nanorod and nanoparticle structures, enhance performance in self and applied fields. Of particular interest for additions are Ba-containing perovskites that are compatible with
[...] Read more.
Many second phase additions to YBa2Cu3O7−x (YBCO) films, in particular those that self-assemble into aligned nanorod and nanoparticle structures, enhance performance in self and applied fields. Of particular interest for additions are Ba-containing perovskites that are compatible with YBCO. In this report, we discuss the addition of Ba2YRuO6 to bulk and thick-film YBCO. Sub-micron, randomly oriented particles of this phase were found to form around grain boundaries and within YBCO grains in bulk sintered pellets. Within the limits of EDS, no Ru substitution into the YBCO was observed. Thick YBCO films were grown by pulsed laser deposition from a target consisting of YBa2Cu3Oy with 5 and 2.5 mole percent additions of Ba2YRuO6 and Y2O3, respectively. Films with enhanced in-field performance contained aligned, self-assembled Ba2YRuO6 nanorods and strained Y2O3 nanoparticle layers. A 0.9 µm thick film was found to have a self-field critical current density (Jc) of 5.1 MA/cm2 with minimum Jc(Q, H=1T) of 0.75 MA/cm2. Conversely, Jc characteristics were similar to YBCO films without additions when these secondary phases formed as large, disordered phases within the film. A 2.3 µm thick film with such a distribution of secondary phases was found to have reduced self-field Jc values of 3.4 MA/cm2 at 75.5 K and Jc(min, Q, 1T) of 0.4 MA/cm2. Full article
(This article belongs to the Special Issue New High Tc Superconductor)
Open AccessArticle The Origin of Tc Enhancement in Heterostructure Cuprate Superconductors
Materials 2011, 4(10), 1835-1845; doi:10.3390/ma4101835
Received: 2 August 2011 / Revised: 24 September 2011 / Accepted: 9 October 2011 / Published: 17 October 2011
Cited by 5 | PDF Full-text (287 KB) | HTML Full-text | XML Full-text
Abstract
Recent experiments on heterostructures composed of two or more films of cuprate superconductors of different oxygen doping levels have shown a remarkable Tc enhancement (up to 50%) relative to single compound films. We provide a simple explanation of the enhancement which arises
[...] Read more.
Recent experiments on heterostructures composed of two or more films of cuprate superconductors of different oxygen doping levels have shown a remarkable Tc enhancement (up to 50%) relative to single compound films. We provide a simple explanation of the enhancement which arises naturally from a collection of experimental works. We show that the enhancement could be caused by a structural change in the lattice, namely an increase in the distance of the apical oxygen from the copper-oxygen plane. This increase modifies the effective off-site interaction in the plane which in turn enhances the d-wave superconductivity order parameter. To illustrate this point we study the extended Hubbard model using the fluctuation exchange approximation. Full article
(This article belongs to the Special Issue New High Tc Superconductor)

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