Absence of Long-Range Order in a Triangular Spin System with Dipolar Interactions

Download
2018-05-01
The antiferromagnetic Heisenberg model on the triangular lattice is perhaps the best known example of frustrated magnets, but it orders at low temperatures. Recent density matrix renormalization group (DMRG) calculations find that the next nearest neighbor interaction J(2) enhances the frustration, and it leads to a spin liquid for J(2)/J(1) is an element of (0.08, 0.15). In addition, a DMRG study of a dipolar Heisenberg model with longer range interactions gives evidence for a spin liquid at a small dipole tilting angle theta is an element of [0, 10 degrees). In both cases, the putative spin liquid region appears to be small. Here, we show that for the triangular lattice dipolar Heisenberg model, a robust quantum paramagnetic phase exists in a surprisingly wide region, theta is an element of [0, 54 degrees), for dipoles tilted along the lattice diagonal direction. We obtain the phase diagram of the model by functional renormalization group (RG), which treats all magnetic instabilities on equal footing. The quantum paramagnetic phase is characterized by a smooth continuous flow of vertex functions and spin susceptibility down to the lowest RG scale, in contrast to the apparent breakdown of RG flow in phases with stripe or spiral order. Our finding points to a promising direction to search for quantum spin liquids in ultracold dipolar molecules.
PHYSICAL REVIEW LETTERS

Suggestions

Competing many-body instabilities in two-dimensional dipolar Fermi gases
Keleş, Ahmet (2016-09-01)
Experiments on quantum degenerate Fermi gases of magnetic atoms and dipolar molecules begin to probe their broken-symmetry phases dominated by the long-range, anisotropic dipole-dipole interaction. Several candidate phases including the p-wave superfluid, the stripe density wave, and a supersolid have been proposed theoretically for two-dimensional spinless dipolar Fermi gases. Yet the phase boundaries predicted by different approximations vary greatly and a definitive phase diagram is still lacking. Here w...
Extensive deformation behavior of an all-oxide Al2O3-TiO2 nanostructured multilayer ceramic at room temperature
Dericioğlu, Arcan Fehmi; Kagawa, Yutaka (Cambridge University Press (CUP), 2009-11-01)
An all-oxide Al2O3-TiO2 ceramic multilayer composed of 10-100 nm thick alternating layers was fabricated using the reactive magnetron sputtering process. Microindentation tests were carried out on the multilayer ceramic followed by microstructural observations of the cross-sections of the indented sites to characterize the indentation response of the system. During the observations, it was noted that an extensive room temperature "deformation" occurred in the multilayer ceramic material. The material shows ...
On the elastic-plastic deformation of a centrally heated cylinder exhibiting linear hardening
Gulgec, M; Orcan, Y (1999-01-01)
A closed-form solution of the elastic-plastic deformation of a cylinder with uniform temperature inside its cylindrical core and zero surface temperature is presented for a linearly strain hardening material. The analysis is based on Tresca's yield condition and its associated flow rule. The effect of hardening on the expansion of plastic regions and on the distribution of stress is displayed graphically.
VARIATION OF THE LATTICE-PARAMETERS OF A BI-BASED SUPERCONDUCTOR WITH TEMPERATURE
HAMDAN, NM; OZKAN, H; ZIQ, KA; ALBIS, BA (1994-12-01)
Variation of the lattice parameters and thermal expansion coefficients of Bi-2223 superconductor have been measured from room temperature up to the melting point using X-ray diffraction. The lattice parameters (a and c) gradually increase up to about 250 degrees C. Between 250 degrees C to 450 degrees C the variation of the lattice parameters are quite anomalous, in that a remains almost constant while c decreases. From 450 degrees C to 600 degrees C both parameters gradually increase. Above 650 degrees C t...
Absence of topological effects in the gauged SU(2) nonlinearσmodel in 2+1 dimensions
Pak, NAMIK KEMAL; Percacci, R. (American Physical Society (APS), 1987-10-15)
We first review the θ sectors of the pure SU(2) nonlinear σ model and the quantization of the topological mass in the SU(2) Yang-Mills theory in 2+1 dimensions. We then show that when the two models are coupled the θ sectors disappear and the topological mass need not be quantized. We work in a canonical formalism and emphasize the role of functional magnetic fields.
Citation Formats
A. Keleş, “Absence of Long-Range Order in a Triangular Spin System with Dipolar Interactions,” PHYSICAL REVIEW LETTERS, pp. 0–0, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/44068.