Neutron Scattering Studies of Vortex Matter in Type-II Superconductors Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Title

  • Main Title Neutron Scattering Studies of Vortex Matter in Type-II Superconductors

Creator

  • Author: Ling, Xinsheng
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Brown University
    Place of Publication: United States

Date

  • Creation: 2012-02-02

Language

  • English

Description

  • Content Description: The proposed program is an experimental study of the fundamental properties of Abrikosov vortex matter in type-II superconductors. Most superconducting materials used in applications such as MRI are type II and their transport properties are determined by the interplay between random pinning, interaction and thermal fluctuation effects in the vortex state. Given the technological importance of these materials, a fundamental understanding of the vortex matter is necessary. The vortex lines in type-II superconductors also form a useful model system for fundamental studies of a number of important issues in condensed matter physics, such as the presence of a symmetry-breaking phase transition in the presence of random pinning. Recent advances in neutron scattering facilities such as the major upgrade of the NIST cold source and the Spallation Neutron Source are providing unprecedented opportunities in addressing some of the longstanding issues in vortex physics. The core component of the proposed program is to use small angle neutron scattering and Bitter decoration experiments to provide the most stringent test of the Bragg glass theory by measuring the structure factor in both the real and reciprocal spaces. The proposed experiments include a neutron reflectometry experiment to measure the precise Q-dependence of the structure factor of the vortex lattice in the Bragg glass state. A second set of SANS experiments will be on a shear-strained Nb single crystal for testing a recently proposed theory of the stability of Bragg glass. The objective is to artificially create a set of parallel grain boundaries into a Nb single crystal and use SANS to measure the vortex matter diffraction pattern as a function of the changing angle between the applied magnetic field to the grain boundaries. The intrinsic merits of the proposed work are a new fundamental understanding of type-II superconductors on which superconducting technology is based, and a firm understanding of phases and phase transitions in condensed matter systems with random pinning. The broader impact of the program includes the training of future generation of neutron scientists, and further development of neutron scattering and complementary techniques for studies of superconducting materials. The graduate and undergraduate students participating in this project will learn the state-of-the-art neutron scattering techniques, acquire a wide range of materials research experiences, and participate in the frontier research of superconductivity. This should best prepare the students for future careers in academia, industry, or government.

Subject

  • Keyword: Superconductivity
  • Keyword: Magnetic Fields
  • STI Subject Categories: 75 Condensed Matter Physics, Superconductivity And Superfluidity
  • Keyword: Neutron Scattering, Vortex Matter
  • Keyword: Structure Factors
  • Keyword: Glass
  • Keyword: Type-Ii Superconductors Neutron Scattering, Vortex Matter
  • Keyword: Training
  • Keyword: Diffraction
  • Keyword: Transport
  • Keyword: Physics
  • Keyword: Fluctuations
  • Keyword: Symmetry Breaking
  • Keyword: Monocrystals
  • Keyword: Testing
  • Keyword: Spallation
  • Keyword: Neutrons
  • Keyword: Stability
  • Keyword: Scattering
  • STI Subject Categories: 36 Materials Science
  • Keyword: Grain Boundaries
  • Keyword: Neutron Sources

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Report No.: DOE/07ER46458
  • Grant Number: FG02-07ER46458
  • DOI: 10.2172/1046783
  • Office of Scientific & Technical Information Report Number: 1046783
  • Archival Resource Key: ark:/67531/metadc845117