Bound spinon excitations in the spin- 12 anisotropic triangular antiferromagnet Ca3ReO5Cl2

Abstract

The spin excitations of the S = 1/2 anisotropic triangular antiferromagnet Ca 3 ReO 5 Cl 2 were investigated by inelastic neutron-scattering experiments. The spin excitation spectrum exhibits sharp dispersive modes in addition to a spinonlike continuum. The sharp modes exhibit large and small dispersions along the intrachain (K) and interchain directions (L), respectively, reflecting a one-dimensional character modified by interchain interactions. The dispersion intensity along the interchain direction is enhanced at the wave vectors around (K, L) = (0.25, ±1.0) and (0.75, 0.0) (in reciprocal lattice units, r.l.u.). This enhancement is well explained by the formation of bound spinon pairs. These features are reminiscent of the spin excitations observed in the prototypical compound Cs 2 CuCl 4 [Coldea, et al.,

Quantum critical Tomonaga-Luttinger liquid in the anisotropic triangular antiferromagnet Ca3ReO5Cl2

“…spin chain. This observation is well consistent with the previous results [31][32][33] . From the ttings using Eq.…”

“…2). This together with the T-linear heat capacity and gapless spinon excitation [31][32][33] corroborates the stabilization of the TLL regime 11,34,35 . In case the transverse (longitudinal) spin uctuations are dominant in the TLL phase, the spin-lattice relaxation rate follows 1/T 1 ∝T 1/2K−1 (1/T 1 ∝T 2K′−1 ) [34][35][36][37] .…”

Extremely Large Magnetoresistance in the Hourglass Dirac Loop Chain Metal β-ReO2

“…2,3) Particularly observed in rhenium compounds are superconductivity in Cd2Re2O7 and HgxReO3, [4][5][6][7] multipole orders in Cd2Re2O7 and Ba2MgReO6, [8][9][10][11][12] half-metallic states above room temperature in A2BReO6, 13,14) pleochroism in Ca3ReO5Cl2, 15) and frustrated magnetism in A3ReO5Cl2. [16][17][18] For sp electron systems, on the other hand, unconventional properties derived from the topology of Fermi surface have attracted considerable attention. The topological semimetal has a singular point at a crossing of two bands with linear dispersion in the band structure, which is protected by symmorphic crystal symmetry such as a mirror plane.…”

Isothermal and adiabatic magnetization processes of the spin-$\frac{1}{2}$ Heisenberg model on an anisotropic triangular lattice

“…Inspired by the recent development of pulsed magnetic field generators [1,2] and the experimental results of ITL compounds [32][33][34], we investigated the magnetic susceptibility, magnetic entropy, isothermal and adiabatic magnetization curves, and the MCE of the ITL using the OFTLM.…”

“…Very recently, A 3 ReO 5 Cl 2 (A = Ca, Ba, Sr) and spin-1/2 ITL compounds have been intensively studied [32][33][34]. Therefore, theoretical calculations of the isothermal and adiabatic magnetization curves and MCE in the ITL Heisenberg model are necessary for future experimental studies.…”