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research article

Pressure dependence of the magnetic order in CrAs: A neutron diffraction investigation

Keller, L.
•
White, J. S.
•
Frontzek, M.
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2015
Physical Review B

The suppression of magnetic order with pressure concomitant with the appearance of pressure-induced superconductivity was recently discovered in CrAs. Here we present a neutron diffraction study of the pressure evolution of the helimagnetic ground state towards and in the vicinity of the superconducting phase. Neutron diffraction on polycrystalline CrAs was employed from zero pressure to 0.65 GPa and at various temperatures. The helimagnetic long-range order is sustained under pressure and the magnetic propagation vector does not show any considerable change. The average ordered magnetic moment is reduced from 1.73(2) mu(B) at ambient pressure to 0.4(1) mu(B) close to the critical pressure P-c approximate to 0.7 GPa, at which magnetic order is completely suppressed. The width of the magnetic Bragg peaks strongly depends on temperature and pressure, showing a maximum in the region of the onset of superconductivity. We interpret this as associated with competing ground states in the vicinity of the superconducting phase.

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Type
research article
DOI
10.1103/PhysRevB.91.020409
Web of Science ID

WOS:000348677100001

Author(s)
Keller, L.
•
White, J. S.
•
Frontzek, M.
•
Babkevich, P.  
•
Susner, M. A.
•
Sims, Z. C.
•
Sefat, A. S.
•
Rønnow, Henrik M.  
•
Rueegg, Ch.
Date Issued

2015

Published in
Physical Review B
Volume

91

Issue

2

Article Number

020409(R)

Subjects

MPBH

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LQM  
Available on Infoscience
May 29, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/114699
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