Neutron diffraction of field-induced magnon condensation in the spin-dimerized antiferromagnet Sr${}_3$Cr${}_2$O${}_8$

Abstract

In this work, we investigate the evolution and settling of magnon condensation in the spin-1/2 dimer system Sr${}_3$Cr${}_2$O${}_8$ using a combination of magnetostriction in pulsed fields and inelastic neutron scattering in a continuous magnetic field. The magnetic structure in the Bose-Einstein condensation (BEC) phase was probed by neutron diffraction in pulsed magnetic fields up to 39~T. The magnetic structure in this phase was confirmed to be an XY-antiferromagnetic structure validated by irreducible representational analysis. The magnetic phase diagram as a function of an applied magnetic field for this system is presented. Furthermore, zero-field neutron diffraction results indicate that dimerization plays an important role in stabilizing the low-temperature crystal structure.

6 pages, 4 figures

References in corpus (5)

• Bose-Einstein Condensation in Magnetic Insulators
• High resolution magnetostriction measurements in pulsed magnetic fields using Fibre Bragg Gratings
• Bose-Einstein Condensation of Triplons in Ba3Cr2O8
• Magnetostriction in the Bose-Einstein Condensate quantum magnet NiCl2-4SC(NH2)2
• Infrared phonons and specific heat in Ba3Cr2O8