Decomposing the Bragg glass and the peak effect in a Type-II superconductor

Rasmus Toft-Petersen, Asger Bech Abrahamsen, Sandor Balog, Lionel Porcar, Mark Laver*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Adding impurities or defects destroys crystalline order. Occasionally, however, extraordinary behaviour emerges that cannot be explained by perturbing the ordered state. One example is the Kondo effect, where magnetic impurities in metals drastically alter the temperature dependence of resistivity. In Type-II superconductors, disorder generally works to pin vortices, giving zero resistivity below a critical current j(c). However, peaks have been observed in the temperature and field dependences of j(c). This peak effect is difficult to explain in terms of an ordered Abrikosov vortex lattice. Here we test the widespread paradigm that an order-disorder transition of the vortex ensemble drives the peak effect. Using neutron scattering to probe the vortex order in superconducting vanadium, we uncover an order-disorder transition from a quasi-long-range-ordered phase to a vortex glass. The peak effect, however, is found to lie at higher fields and temperatures, in a region where thermal fluctuations of individual vortices become significant.
Original languageEnglish
Article number901
JournalNature Communications
Volume9
Issue number1
Number of pages12
ISSN2041-1723
DOIs
Publication statusPublished - 2018

Cite this

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title = "Decomposing the Bragg glass and the peak effect in a Type-II superconductor",
abstract = "Adding impurities or defects destroys crystalline order. Occasionally, however, extraordinary behaviour emerges that cannot be explained by perturbing the ordered state. One example is the Kondo effect, where magnetic impurities in metals drastically alter the temperature dependence of resistivity. In Type-II superconductors, disorder generally works to pin vortices, giving zero resistivity below a critical current j(c). However, peaks have been observed in the temperature and field dependences of j(c). This peak effect is difficult to explain in terms of an ordered Abrikosov vortex lattice. Here we test the widespread paradigm that an order-disorder transition of the vortex ensemble drives the peak effect. Using neutron scattering to probe the vortex order in superconducting vanadium, we uncover an order-disorder transition from a quasi-long-range-ordered phase to a vortex glass. The peak effect, however, is found to lie at higher fields and temperatures, in a region where thermal fluctuations of individual vortices become significant.",
author = "Rasmus Toft-Petersen and Abrahamsen, {Asger Bech} and Sandor Balog and Lionel Porcar and Mark Laver",
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Decomposing the Bragg glass and the peak effect in a Type-II superconductor. / Toft-Petersen, Rasmus; Abrahamsen, Asger Bech; Balog, Sandor; Porcar, Lionel; Laver, Mark.

In: Nature Communications, Vol. 9, No. 1, 901, 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Decomposing the Bragg glass and the peak effect in a Type-II superconductor

AU - Toft-Petersen, Rasmus

AU - Abrahamsen, Asger Bech

AU - Balog, Sandor

AU - Porcar, Lionel

AU - Laver, Mark

PY - 2018

Y1 - 2018

N2 - Adding impurities or defects destroys crystalline order. Occasionally, however, extraordinary behaviour emerges that cannot be explained by perturbing the ordered state. One example is the Kondo effect, where magnetic impurities in metals drastically alter the temperature dependence of resistivity. In Type-II superconductors, disorder generally works to pin vortices, giving zero resistivity below a critical current j(c). However, peaks have been observed in the temperature and field dependences of j(c). This peak effect is difficult to explain in terms of an ordered Abrikosov vortex lattice. Here we test the widespread paradigm that an order-disorder transition of the vortex ensemble drives the peak effect. Using neutron scattering to probe the vortex order in superconducting vanadium, we uncover an order-disorder transition from a quasi-long-range-ordered phase to a vortex glass. The peak effect, however, is found to lie at higher fields and temperatures, in a region where thermal fluctuations of individual vortices become significant.

AB - Adding impurities or defects destroys crystalline order. Occasionally, however, extraordinary behaviour emerges that cannot be explained by perturbing the ordered state. One example is the Kondo effect, where magnetic impurities in metals drastically alter the temperature dependence of resistivity. In Type-II superconductors, disorder generally works to pin vortices, giving zero resistivity below a critical current j(c). However, peaks have been observed in the temperature and field dependences of j(c). This peak effect is difficult to explain in terms of an ordered Abrikosov vortex lattice. Here we test the widespread paradigm that an order-disorder transition of the vortex ensemble drives the peak effect. Using neutron scattering to probe the vortex order in superconducting vanadium, we uncover an order-disorder transition from a quasi-long-range-ordered phase to a vortex glass. The peak effect, however, is found to lie at higher fields and temperatures, in a region where thermal fluctuations of individual vortices become significant.

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