Competing symmetries and broken bonds in superconducting vortex-antivortex molecular crystals

J S Neal, M V Milosevic, S J Bending, A Potenza, L S Emeterio, C H Marrows

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Hall probe microscopy has been used to image vortex-antivortex molecules induced in superconducting Pb films by the stray fields from square arrays of magnetic dots. We have directly observed spontaneous vortex-antivortex pairs and studied how they interact with added free (anti)fluxons in an applied magnetic field. We observe a variety of phenomena arising from competing symmetries which either drive added antivortices to join antivortex shells around dots or stabilize the translationally symmetric antivortex lattice between the dots. Added vortices annihilate antivortex shells, leading first to a stable “nulling state” with no free fluxons and then, at high densities, to vortex shells around the dots stabilized by the asymmetric antipinning potential. Our experimental findings are in good agreement with Ginzburg-Landau calculations.
Original languageEnglish
Article number127001
JournalPhysical Review Letters
Volume99
Issue number12
DOIs
Publication statusPublished - 2007

Fingerprint

vortices
symmetry
crystals
superconducting films
microscopy
probes
magnetic fields
molecules

Cite this

Competing symmetries and broken bonds in superconducting vortex-antivortex molecular crystals. / Neal, J S; Milosevic, M V; Bending, S J; Potenza, A; Emeterio, L S; Marrows, C H.

In: Physical Review Letters, Vol. 99, No. 12, 127001, 2007.

Research output: Contribution to journalArticle

Neal, J S ; Milosevic, M V ; Bending, S J ; Potenza, A ; Emeterio, L S ; Marrows, C H. / Competing symmetries and broken bonds in superconducting vortex-antivortex molecular crystals. In: Physical Review Letters. 2007 ; Vol. 99, No. 12.
@article{47dae76f487345a581a0ac45be8b4b0d,
title = "Competing symmetries and broken bonds in superconducting vortex-antivortex molecular crystals",
abstract = "Hall probe microscopy has been used to image vortex-antivortex molecules induced in superconducting Pb films by the stray fields from square arrays of magnetic dots. We have directly observed spontaneous vortex-antivortex pairs and studied how they interact with added free (anti)fluxons in an applied magnetic field. We observe a variety of phenomena arising from competing symmetries which either drive added antivortices to join antivortex shells around dots or stabilize the translationally symmetric antivortex lattice between the dots. Added vortices annihilate antivortex shells, leading first to a stable “nulling state” with no free fluxons and then, at high densities, to vortex shells around the dots stabilized by the asymmetric antipinning potential. Our experimental findings are in good agreement with Ginzburg-Landau calculations.",
author = "Neal, {J S} and Milosevic, {M V} and Bending, {S J} and A Potenza and Emeterio, {L S} and Marrows, {C H}",
note = "ID number: ISI:000249668000066",
year = "2007",
doi = "10.1103/PhysRevLett.99.127001",
language = "English",
volume = "99",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "12",

}

TY - JOUR

T1 - Competing symmetries and broken bonds in superconducting vortex-antivortex molecular crystals

AU - Neal, J S

AU - Milosevic, M V

AU - Bending, S J

AU - Potenza, A

AU - Emeterio, L S

AU - Marrows, C H

N1 - ID number: ISI:000249668000066

PY - 2007

Y1 - 2007

N2 - Hall probe microscopy has been used to image vortex-antivortex molecules induced in superconducting Pb films by the stray fields from square arrays of magnetic dots. We have directly observed spontaneous vortex-antivortex pairs and studied how they interact with added free (anti)fluxons in an applied magnetic field. We observe a variety of phenomena arising from competing symmetries which either drive added antivortices to join antivortex shells around dots or stabilize the translationally symmetric antivortex lattice between the dots. Added vortices annihilate antivortex shells, leading first to a stable “nulling state” with no free fluxons and then, at high densities, to vortex shells around the dots stabilized by the asymmetric antipinning potential. Our experimental findings are in good agreement with Ginzburg-Landau calculations.

AB - Hall probe microscopy has been used to image vortex-antivortex molecules induced in superconducting Pb films by the stray fields from square arrays of magnetic dots. We have directly observed spontaneous vortex-antivortex pairs and studied how they interact with added free (anti)fluxons in an applied magnetic field. We observe a variety of phenomena arising from competing symmetries which either drive added antivortices to join antivortex shells around dots or stabilize the translationally symmetric antivortex lattice between the dots. Added vortices annihilate antivortex shells, leading first to a stable “nulling state” with no free fluxons and then, at high densities, to vortex shells around the dots stabilized by the asymmetric antipinning potential. Our experimental findings are in good agreement with Ginzburg-Landau calculations.

UR - http://link.aps.org/doi/10.1103/PhysRevLett.99.127001

U2 - 10.1103/PhysRevLett.99.127001

DO - 10.1103/PhysRevLett.99.127001

M3 - Article

VL - 99

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 12

M1 - 127001

ER -