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Frozen disorder and edge contamination in magnetization measurements of the Bragg glass phase

Küpfer, H., Ravikumar, G., Wolf, Th., Zhukov, A.A. and Meier-Hirmer, R. (2004) Frozen disorder and edge contamination in magnetization measurements of the Bragg glass phase Physical Review B, 70, (14), 144509-[8pp]. (doi:10.1103/PhysRevB.70.144509).

Record type: Article


The Bragg glass phase and its transition into the disordered vortex state at high fields are investigated by magnetization measurements in V3Si varying nucleation and annealing of metastable disorder in a distinct manner. The extension of the Bragg glass becomes reduced by disorder from edge contamination and by frozen disordered phase. The relevance of these effects and their mutual interference depend on the lifetime of the metastable disorder and the time scale of the measurement. Magnetization loops, sequences of minor loops, and the transient decay of the irreversible moment are investigated by varying the sweep rate of the applied magnetic field and vortex shaking from the vibration amplitude of the magnetometer. Deviations from the standard Bean model based on a homogeneous flux distribution are used to separate frozen disorder, edge contamination, and Bean critical current in the Bragg glass phase. A comparison with YBa2Cu3O7 demonstrates the common nature of these contributions to the magnetic moment and the importance to identify them for the correct interpretation of vortex phase diagrams.

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Published date: 18 October 2004
Keywords: vanadium compounds, superconducting materials, magnetisation, mixed state, nucleation, annealing, bean model, phase diagrams, magnetic moments, surface contamination


Local EPrints ID: 37676
ISSN: 1550-235X
PURE UUID: 42cadd85-8678-4229-bc17-76e1db181278

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Date deposited: 25 May 2006
Last modified: 17 Jul 2017 15:41

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Author: H. Küpfer
Author: G. Ravikumar
Author: Th. Wolf
Author: A.A. Zhukov
Author: R. Meier-Hirmer

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