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| Home > Publications database > Magnetic‐Field‐Controlled Quantum Critical Points in the Triangular Antiferromagnetic Cs$_{2}$ CuCl$_{4-x}$ Br$_{x}$ Mixed System |
| Home > Publications database > Magnetic‐Field‐Controlled Quantum Critical Points in the Triangular Antiferromagnetic Cs$_{2}$ CuCl$_{4-x}$ Br$_{x}$ Mixed System |
| Journal Article | IMPULSE-2020-00213 |
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2020
Barth54400
Leipzig
Please use a persistent id in citations: doi:10.1002/andp.202000147
Abstract: The triangular antiferromagnetic Cs2CuCl4‐xBrx 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 Bc is found for a Br concentration x = 0.8 at Bc = 8.10(1) T and for x = 1.1 at Bc = 7.73(1) T and from regime IV (3.2 < x < 4) for x = 3.3 at Bc = 0.99(3) T. For magnetic fields larger than the respective Bc, magnetic superlattice reflections of these compounds are not found. The incommensurate magnetic wave vector q = (0, 0.470, 0) appears below the ordering temperature TN = 0.51(1) K for Cs2CuCl3.2Br0.8, and q = (0, 0.418, 0) below TN = 1.00(6) K for Cs2CuCl0.3Br3.7. Neutron diffraction experiments at around 60 mK for x = 3.7 in a magnetic field show the critical magnetic field at Bc = 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. Magnetic phase diagram of Cs2CuCl4‐xBrx shows a separation of two magnetic phases in the magnetic field. This is shown to occur above 8.5 T for Cs2CuCl0.3Br3.7.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)
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