Inelastic Neutron Scattering in Weakly Coupled Triangular Spin Tubes CsCrF${}_4$

Abstract

We performed inelastic neutron scattering (INS) experiments to measure spin dynamics on a polycrystalline sample of a spin tube candidate CsCrF${}_4$. The compound exhibits a successive phase transition from a paramagnetic phase through an intermediate temperature (IT) phase of a 120${}^{\circ }$ structure to a low temperature (LT) phase of another 120${}^{\circ }$ structure. Elaborate comparison between observed and calculated neutron spectra in LT phase reveals that the spin Hamiltonian is identified as antiferromagnetic spin tubes including perturbative terms of intertube interaction, Dzyaloshinskii-Moriya interaction, and single ion anisotropy. A phase diagram for the ground state is classically calculated. A set of parameters in the spin Hamiltonian obtained from the INS spectra measured in LT phase is quite close to a boundary to the phase of the 120${}^{\circ }$ structure of IT phase. The INS spectra measured in IT phase is, surprisingly, the same as those in LT phase in the level of powder averaged spectra, even though the magnetic structures in IT and LT phases are different. Identical dynamical structures compatible with two different static structures are observed. No difference in the observed spectra indicates no change of the spin Hamiltonian with the temperature, suggesting that the origin of the successive phase transition being order-by-disorder mechanism.

References in corpus (12)

• Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
• Twelve sublattice ordered phase in the J1-J2 model on the kagome lattice
• Quantum phase transitions of the asymmetric three-leg spin tube
• Low-lying excitations of the three-leg spin tube using the density-matrix renormalization group method
• Classical dipoles on the kagome lattice
• Anomalous spin-waves and the commensurate-incommensurate magnetic phase transition in LiNiPO4
• Kagome-Triangular Lattice Antiferromagnet NaBa2Mn3F11
• Coexistence of vector chiral order and Tomonaga-Luttinger liquid in the frustrated three-leg spin tube in a magnetic field
• Magnetic phase diagram of the coupled triangular spin tubes for CsCrF4
• Persistence of the flat band in a kagome magnet with dipolar interactions
• Zero-energy excitation in the classical kagome antiferromagnet NaBa${}_2$Mn${}_3$F${}_{11}$
• Magnetic order in the chemically-substituted frustrated antiferromagnet CsCrF${}_4$

Cited by in corpus (1)

• Breakdown of the conventional spin-wave dynamics and its double-constraint modification in the spin-$\frac{1}{2}$ triangular-prism Heisenberg antiferromagnet