Anisotropic Critical Magnetic Fluctuations in the Ferromagnetic Superconductor UCoGe

C Stock; D Sokolov; P Bourges; P Tobash; K Gofryk; F Ronning; E Bauer; K Rule; A Huxley

doi:10.1103/PhysRevLett.107.187202

Anisotropic Critical Magnetic Fluctuations in the Ferromagnetic Superconductor UCoGe

C Stock, D Sokolov, P Bourges, P Tobash, K Gofryk, F Ronning, E Bauer, K Rule, A Huxley

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We report neutron scattering measurements of critical magnetic excitations in the weakly ferromagnetic superconductor UCoGe. The strong non-Landau damping of the excitations we observe, although unusual, has been found in another related ferromagnet, UGe2 at zero pressure. However, we also find that there is a significant anisotropy of the magnetic correlation length in UCoGe that contrasts with an almost isotropic length for UGe2. The values of the magnetic correlation length and damping are found to be compatible with superconductivity on small Fermi-surface pockets. The anisotropy may be important to explain why UCoGe is a superconductor at zero pressure while UGe2 is not.

Original language	English
Article number	187202
Number of pages	5
Journal	Physical Review Letters
Volume	107
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.107.187202
Publication status	Published - 28 Oct 2011

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10.1103/PhysRevLett.107.187202

http://prl.aps.org/abstract/PRL/v107/i18/e187202

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title = "Anisotropic Critical Magnetic Fluctuations in the Ferromagnetic Superconductor UCoGe",

abstract = "We report neutron scattering measurements of critical magnetic excitations in the weakly ferromagnetic superconductor UCoGe. The strong non-Landau damping of the excitations we observe, although unusual, has been found in another related ferromagnet, UGe2 at zero pressure. However, we also find that there is a significant anisotropy of the magnetic correlation length in UCoGe that contrasts with an almost isotropic length for UGe2. The values of the magnetic correlation length and damping are found to be compatible with superconductivity on small Fermi-surface pockets. The anisotropy may be important to explain why UCoGe is a superconductor at zero pressure while UGe2 is not.",

author = "C Stock and D Sokolov and P Bourges and P Tobash and K Gofryk and F Ronning and E Bauer and K Rule and A Huxley",

year = "2011",

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doi = "10.1103/PhysRevLett.107.187202",

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AU - Stock, C

AU - Sokolov, D

AU - Bourges, P

AU - Tobash, P

AU - Gofryk, K

AU - Ronning, F

AU - Bauer, E

AU - Rule, K

AU - Huxley, A

PY - 2011/10/28

Y1 - 2011/10/28

N2 - We report neutron scattering measurements of critical magnetic excitations in the weakly ferromagnetic superconductor UCoGe. The strong non-Landau damping of the excitations we observe, although unusual, has been found in another related ferromagnet, UGe2 at zero pressure. However, we also find that there is a significant anisotropy of the magnetic correlation length in UCoGe that contrasts with an almost isotropic length for UGe2. The values of the magnetic correlation length and damping are found to be compatible with superconductivity on small Fermi-surface pockets. The anisotropy may be important to explain why UCoGe is a superconductor at zero pressure while UGe2 is not.

AB - We report neutron scattering measurements of critical magnetic excitations in the weakly ferromagnetic superconductor UCoGe. The strong non-Landau damping of the excitations we observe, although unusual, has been found in another related ferromagnet, UGe2 at zero pressure. However, we also find that there is a significant anisotropy of the magnetic correlation length in UCoGe that contrasts with an almost isotropic length for UGe2. The values of the magnetic correlation length and damping are found to be compatible with superconductivity on small Fermi-surface pockets. The anisotropy may be important to explain why UCoGe is a superconductor at zero pressure while UGe2 is not.

U2 - 10.1103/PhysRevLett.107.187202

DO - 10.1103/PhysRevLett.107.187202

M3 - Article

SN - 1079-7114

VL - 107

JO - Physical Review Letters

JF - Physical Review Letters

IS - 18

M1 - 187202

ER -

Anisotropic Critical Magnetic Fluctuations in the Ferromagnetic Superconductor UCoGe

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