Flux pinning in superconductors Teruo Matsushita

Format:

Book

Author/Creator:

Matsushita, Teruo, 1948- author.

Series:

Springer series in solid-state sciences 178

Language:

English

Subjects (All):

Flux pinning.

Superconductors.

superconductor.

Physical Description:

1 online resource

Edition:

Second edition

Place of Publication:

Berlin Springer [2014]

Language Note:

English

Summary:

The book covers the flux pinning mechanisms and properties and the electromagnetic phenomena caused by the flux pinning common for metallic, high-Tc and MgB2 superconductors. The condensation energy interaction known for normal precipitates or grain boundaries and the kinetic energy interaction proposed for artificial Nb pins in Nb-Ti, etc., are introduced for the pinning mechanism. Summation theories to derive the critical current density are discussed in detail. Irreversible magnetization and AC loss caused by the flux pinning are also discussed. The loss originally stems from the ohmic dissipation of normal electrons in the normal core driven by the electric field induced by the flux motion. The readers will learn why the resultant loss is of hysteresis type in spite of such mechanism. The influence of the flux pinning on the vortex phase diagram in high Tc superconductors is discussed, and the dependencies of the irreversibility field are also described on other quantities such as anisotropy of superconductor, specimen size and electric field strength. Recent developments of critical current properties in various high-Tc superconductors and MgB2 are introduced. Other topics are: singularity in the case of transport current in a parallel magnetic field such as deviation from the Josephson relation, reversible flux motion inside pinning potentials which causes deviation from the critical state model prediction, the concept of the minimization of energy dissipation in the flux pinning phenomena which gives the basis for the critical state model, etc. Significant reduction in the AC loss in AC wires with very fine filaments originates from the reversible flux motion which is dominant in the two-dimensional pinning. The concept of minimum energy dissipation explains also the behavior of flux bundle size which determines the irreversibility line under the flux creep. The new edition has been thoroughly updated, with new sections on the progress in enhancing the critical current density in high temperature superconductors by introduction of artificial pinning centers, the effect of packing density on the critical current density and irreversibility field in MgB2 and derivation of the force-balance equation from the minimization of the free energy including the pinning energy

Contents:

From the Contents: Fundamental Electromagnetic Phenomena in Superconductors

Various Electromagnetic Phenomena

Longitudinal Magnetic Field Effect

Measurement Methods for Critical Current Density

Flux Pinning Mechanism

Flux Pinning Characteristics

High-Temperature Superconductors

MgB2

Notes:

Includes bibliographical references and index

Online resource; title from PDF title page (SpringerLink, viewed March 6, 2014)

Other Format:

Print version Matsushita, Teruo, 1948- Flux pinning in superconductors.

ISBN:

9783642453120

3642453120

OCLC:

871539875

Access Restriction:

Restricted for use by site license