1. Pressure dependence of the magnetic order in CrAs: a neutron diffraction investigation
- Author
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Keller, L., White, J. S., Frontzek, M., Babkevich, P., Susner, M. A., Sims, Z. C., Sefat, A. S., Ronnow, H. M., and Rüegg, Ch.
- Subjects
Condensed Matter - Strongly Correlated Electrons - 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) {\mu}B at ambient pressure to 0.4(1) {\mu}B close to the critical pressure Pc=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.
- Published
- 2014
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