scholarly journals HexagonalRMnO3: a model system for two-dimensional triangular lattice antiferromagnets

2016 ◽  
Vol 72 (1) ◽  
pp. 3-19 ◽  
Author(s):  
Hasung Sim ◽  
Joosung Oh ◽  
Jaehong Jeong ◽  
Manh Duc Le ◽  
Je-Geun Park
Keyword(s):  
Triangular Lattice ◽  
Nearest Neighbor ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Model System ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Spin Lattice ◽  
Lattice Coupling ◽  
Coherent Picture

The hexagonalRMnO3(h-RMnO3) are multiferroic materials, which exhibit the coexistence of a magnetic order and ferroelectricity. Their distinction is in their geometry that both results in an unusual mechanism to break inversion symmetry and also produces a two-dimensional triangular lattice of Mn spins, which is subject to geometrical magnetic frustration due to the antiferromagnetic interactions between nearest-neighbor Mn ions. This unique combination makes theh-RMnO3a model system to test ideas of spin-lattice coupling, particularly when both the improper ferroelectricity and the Mn trimerization that appears to determine the symmetry of the magnetic structure arise from the same structure distortion. In this review we demonstrate how the use of both neutron and X-ray diffraction and inelastic neutron scattering techniques have been essential to paint this comprehensive and coherent picture ofh-RMnO3.

Nature of spin-lattice coupling in two-dimensional CrI3 and CrGeTe3

2021 ◽  
Vol 64 (8) ◽  
Author(s):  
Jing Li ◽  
JunSheng Feng ◽  
PanShuo Wang ◽  
ErJun Kan ◽  
HongJun Xiang
Keyword(s):  
Two Dimensional ◽  
Spin Lattice ◽  
Lattice Coupling

scholarly journals Thermal Robustness of Entanglement in a Dissipative Two-Dimensional Spin System in an Inhomogeneous Magnetic Field

Entropy ◽  
2021 ◽  
Vol 23 (8) ◽  
pp. 1066
Author(s):  
Gehad Sadiek ◽  
Samaher Almalki
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Nearest Neighbor ◽  
Quantum Phase Transitions ◽  
Inhomogeneous Magnetic Field ◽  
Steady States ◽  
Inhomogeneous Field ◽  
Spin States ◽  
Two Dimensional ◽  
Spin Lattice

Recently new novel magnetic phases were shown to exist in the asymptotic steady states of spin systems coupled to dissipative environments at zero temperature. Tuning the different system parameters led to quantum phase transitions among those states. We study, here, a finite two-dimensional Heisenberg triangular spin lattice coupled to a dissipative Markovian Lindblad environment at finite temperature. We show how applying an inhomogeneous magnetic field to the system at different degrees of anisotropy may significantly affect the spin states, and the entanglement properties and distribution among the spins in the asymptotic steady state of the system. In particular, applying an inhomogeneous field with an inward (growing) gradient toward the central spin is found to considerably enhance the nearest neighbor entanglement and its robustness against the thermal dissipative decay effect in the completely anisotropic (Ising) system, whereas the beyond nearest neighbor ones vanish entirely. The spins of the system in this case reach different steady states depending on their positions in the lattice. However, the inhomogeneity of the field shows no effect on the entanglement in the completely isotropic (XXX) system, which vanishes asymptotically under any system configuration and the spins relax to a separable (disentangled) steady state with all the spins reaching a common spin state. Interestingly, applying the same field to a partially anisotropic (XYZ) system does not just enhance the nearest neighbor entanglements and their thermal robustness but all the long-range ones as well, while the spins relax asymptotically to very distinguished spin states, which is a sign of a critical behavior taking place at this combination of system anisotropy and field inhomogeneity.

SUPERSTRIPES BY ANOMALOUS X-RAY DIFFRACTION AND ANGLE RESOLVED PHOTOEMISSION IN BI2212

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3649-3655 ◽  
Author(s):  
N. L. SAINI ◽  
A. BIANCONI
Keyword(s):  
Fermi Surface ◽  
Energy Distribution ◽  
Critical Parameter ◽  
Nearest Neighbor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Coupling

We show an evidence for the superconducting stripes (superstripes) in the Bi2212 system by joint x-ray diffraction and angle resolved photoemission. The kink observed at k y =0.4π in the energy distribution curves is shown to be related to a modulation of the Cu displacement out of the oxygen plane with a wavevector Q ~(0.4π, 0.4π) that modulates the next-nearest neighbor hopping integral t ′. The resulting Fermi surface reveals broken segments around the M points due to the modulation of the t ′, associated with modulation of the electron-lattice coupling λ(ε) that depends on the micro strain ε of the CuO 2 plane. The present findings further enlightens the fact that the micro-strain, controlling the electron-lattice coupling λ(ε) is a critical parameter for the superstripes.

scholarly journals Methyl Group Rotation and Tunnellingin Crystals of 5-Membered Ring Molecules

1988 ◽  
Vol 43 (1) ◽  
pp. 35-42 ◽  
Author(s):  
A.-S. Montjoie ◽  
W. Müller-Warmuth ◽  
Hildegard Stiller ◽  
J. Stanislawski
Keyword(s):  
Elevated Temperatures ◽  
Inelastic Neutron Scattering ◽  
Relaxation Times ◽  
Nmr Relaxation ◽  
Lattice Relaxation ◽  
Inelastic Neutron ◽  
Spin Lattice Relaxation ◽  
Relaxation Rates ◽  
Quantum Tunnelling ◽  
Spin Lattice

Abstract1H NMR spin-lattice relaxation times T1 and -if accessible -level-crossing peaks and inelastic neutron scattering spectra have been measured for solid 2-and 3-methylfuran, 2-and 3-methylthiophene, 3-and 4-methylpyrazole, 1-methylimidazole, and 5-methylisoxazole. From the tunnel splittings, the torsional excitations and the NMR relaxation rates, the molecular dynamics of the methyl rotators has been evaluated between the limits of quantum tunnelling at low temperatures and thermally activated random reorientation at elevated temperatures.

Giant effect of spin–lattice coupling on the thermal transport in two-dimensional ferromagnetic CrI3

2020 ◽  
Vol 8 (10) ◽  
pp. 3520-3526 ◽  
Author(s):  
Guangzhao Qin ◽  
Huimin Wang ◽  
Lichuan Zhang ◽  
Zhenzhen Qin ◽  
Ming Hu
Keyword(s):  
Thermal Conductivity ◽  
Thermal Transport ◽  
Magnetic Storage ◽  
Two Dimensional ◽  
Spin Lattice ◽  
Lattice Coupling

The thermal conductivity of monolayer CrI3 is enlarged more than two orders of magnitude by the spin–lattice coupling, which would be large enough for its applications in nanoelectronics and magnetic storage.

Sign in / Sign up

Export Citation Format

Share Document