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Dive into the research topics where Matthew J. W. Dodgson is active.

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Featured researches published by Matthew J. W. Dodgson.


Physical Review B | 2002

Phase transitions in isolated vortex chains

Matthew J. W. Dodgson

In very anisotropic layered superconductors (e.g., Bi 2 Sr 2 CaCu 2 O x ) a tilted magnetic field can penetrate as two coexisting lattices of vortices parallel and perpendicular to the layers. At low out-of-plane fields the perpendicular vortices form a set of isolated vortex chains, which have recently been observed in detail with scanning Hall-probe measurements. We present calculations that show a very delicate stability of this isolated-chain state. As the vortex density increases along the chain there is a first-order transition to a buckled chain, and then the chain will expel vortices in a continuous transition to a composite-chain state. At low densities there is an instability towards clustering, due to a long-range attraction between the vortices on the chain, and at very low densities it becomes energetically favorable to form a tilted chain, which may explain the sudden disappearance of vortices along the chains seen in recent experiments.


Physical Review Letters | 1998

CHARACTERISTICS OF FIRST-ORDER VORTEX LATTICE MELTING : JUMPS IN ENTROPY AND MAGNETIZATION

Matthew J. W. Dodgson; V. B. Geshkenbein; Henrik Nordborg; G. Blatter

We derive expressions for the jumps in entropy and magnetization characterizing the first-order melting transition of a flux line lattice. In our analysis we account for the temperature dependence of the Landau parameters and make use of the proper shape of the melting line as determined by the relative importance of electromagnetic and Josephson interactions. The results agree well with experiments on anisotropic Y


Physical Review Letters | 2001

Vortex Collisions: Crossing or Recombination?

Malek Georg Bou-Diab; Matthew J. W. Dodgson; G. Blatter

_1


Physical Review Letters | 1999

Defect-Unbinding Transition in Layered Superconductors

Matthew J. W. Dodgson; V. B. Geshkenbein; G. Blatter

Ba


Physical Review B | 1998

THERMODYNAMICS OF THE FIRST-ORDER VORTEX LATTICE MELTING TRANSITION IN YBA2CU3O7-DELTA

Matthew J. W. Dodgson; V. B. Geshkenbein; Henrik Nordborg; G. Blatter

_2


Physical Review Letters | 2006

Composite to tilted vortex lattice transition in Bi2Sr2CaCu2O8+delta in oblique fields.

M. Konczykowski; C.J. van der Beek; A. E. Koshelev; Vincent Mosser; Matthew J. W. Dodgson; P. H. Kes

Cu


Physica C-superconductivity and Its Applications | 2000

Melting and decoupling in the vortex system of layered superconductors

G. Blatter; Matthew J. W. Dodgson; V. B. Geshkenbein

_3


Physical Review Letters | 2007

Composite to tilted vortex lattice transition in

M. Konczykowski; Cornelis Jacominus Van Der Beek; Alexei E. Koshelev; Vincent Mosser; Matthew J. W. Dodgson; Pieter H. Kes

O


Physical Review Letters | 2006

Bi_2 Sr_2 CaCu_2 O_{8+\delta}

M. Konczykowski; C.J. van der Beek; A. E. Koshelev; Vincent Mosser; Matthew J. W. Dodgson; P. H. Kes; Cnrs-Umr

_{7-\delta}


Physica B-condensed Matter | 2000

in oblique fields

Matthew J. W. Dodgson; V. B. Geshkenbein; G. Blatter

and layered Bi

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A. E. Koshelev

Argonne National Laboratory

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P. H. Kes

Weizmann Institute of Science

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