In:
Annalen der Physik, Wiley, Vol. 532, No. 7 ( 2020-07)
Abstract:
The triangular antiferromagnetic Cs 2 CuCl 4‐ x Br x mixed system is studied by neutron single‐crystal diffraction in magnetic field. It shows a rich magnetic phase diagram consisting of four regimes depending on the Br concentration and is characterized by different exchange coupling mechanisms. For the investigated compositions from regime I (0 〈 x ≤ 1.5), a critical magnetic field B c is found for a Br concentration x = 0.8 at B c = 8.10(1) T and for x = 1.1 at B c = 7.73(1) T and from regime IV (3.2 〈 x 〈 4) for x = 3.3 at B c = 0.99(3) T. For magnetic fields larger than the respective B c , magnetic superlattice reflections of these compounds are not found. The incommensurate magnetic wave vector q = (0, 0.470, 0) appears below the ordering temperature T N = 0.51(1) K for Cs 2 CuCl 3.2 Br 0.8 , and q = (0, 0.418, 0) below T N = 1.00(6) K for Cs 2 CuCl 0.3 Br 3.7 . Neutron diffraction experiments at around 60 mK for x = 3.7 in a magnetic field show the critical magnetic field at B c = 7.94(16) T and the formation of the second magnetic phase at around 8.5 T depending on the temperature. Inelastic neutron scattering experiments for the compound from regime III (2 〈 x ≤ 3.2) with x = 2.2 show dynamical correlations at a temperature around 50 mK giving evidence for a spin liquid phase.
Type of Medium:
Online Resource
ISSN:
0003-3804
,
1521-3889
DOI:
10.1002/andp.202000147
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
1479791-4
detail.hit.zdb_id:
2165600-9
detail.hit.zdb_id:
287-2
SSG:
25
