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

L. Keller, J. S. White, M. Frontzek, P. Babkevich, M. A. Susner, Z. C. Sims, A. S. Sefat, H. M. Rønnow, and Ch. Rüegg
Phys. Rev. B 91, 020409(R) – Published 29 January 2015

Abstract

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) μB at ambient pressure to 0.4(1) μB close to the critical pressure Pc0.7 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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  • Received 19 September 2014
  • Revised 24 November 2014

DOI:https://doi.org/10.1103/PhysRevB.91.020409

©2015 American Physical Society

Authors & Affiliations

L. Keller1,*, J. S. White1, M. Frontzek1, P. Babkevich2, M. A. Susner3, Z. C. Sims3, A. S. Sefat3, H. M. Rønnow2,4, and Ch. Rüegg1,5

  • 1Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 2Laboratory for Quantum Magnetism, École Polytéchnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
  • 3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA
  • 4RIKEN Centre for Emergent Matter Science (CEMS), Waki 351-0198, Japan
  • 5Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland

  • *lukas.keller@psi.ch

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Vol. 91, Iss. 2 — 1 January 2015

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