Magnetic investigations of phase transitions, exchange interactions, and magnetic ground state in nanosheets ofβ-Co(OH)2

2017 ◽  
Vol 29 (22) ◽  
pp. 225803 ◽  
Author(s):  
Zhengjun Wang ◽  
Mohindar S Seehra
Keyword(s):  
Phase Transitions ◽  
Ground State ◽  
Exchange Interactions ◽  
Magnetic Ground State

Magnetic ground state and exchange interactions in the Ising chain ferromagnet CoNb2O6

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Subhash Thota ◽  
Sayandeep Ghosh ◽  
Maruthi R ◽  
Deep C. Joshi ◽  
Rohit Medwal ◽  
...  
Keyword(s):  
Ground State ◽  
Exchange Interactions ◽  
Ising Chain ◽  
Magnetic Ground State

scholarly journals Non-collinear ground state and stable bimerons from four-spin chiral interactions in D3h magnet

2021 ◽  
Vol 2015 (1) ◽  
pp. 012118
Author(s):  
G R Rakhmanova ◽  
A N Osipov ◽  
D I Ilin ◽  
I V Shushakova ◽  
I V Iorsh
Keyword(s):  
Phase Transition ◽  
Ground State ◽  
Magnetic Order ◽  
Point Group ◽  
Exchange Interactions ◽  
Two Dimensional ◽  
Magnetic Ground State ◽  
Magnetic Vortices ◽  
Spin Interactions ◽  
Magnetic Skyrmions

Abstract We demonstrate that four-spin interactions in crystals with D3h point group of symmetry can cause a phase transition from a collinear state to a non-collinear magnetic ground state (such as magnetic vortices or magnetic skyrmions), while all anti-symmetric chiral terms are forbidden by symmetry in such crystals. Moreover, D3h point group rather common among two dimensional magnets. Taking into account possible four-spin chiral exchange interactions is important for understanding noncollinear magnetic order in these systems. We also address a possible stabilization of bimerons by the same contribution.

scholarly journals Фазовая диаграмма модели Поттса с числом состояний спина q=4 на гексагональной решетке

2021 ◽  
Vol 63 (5) ◽  
pp. 622
Author(s):  
А.К. Муртазаев ◽  
М.К. Мазагаева ◽  
М.К. Рамазанов ◽  
М.А. Магомедов ◽  
А.А. Муртазаева
Keyword(s):  
Phase Transitions ◽  
Ground State ◽  
Nearest Neighbor ◽  
Hexagonal Lattice ◽  
Magnetic Ordering ◽  
Exchange Interactions ◽  
Antiferromagnetic Interaction ◽  
Two Dimensional ◽  
Magnetic Structures ◽  
First Order

We have carried out Monte Carlo investigations of the phase transitions, thermodynamic properties and ground-state magnetic structures in two-dimensional 4-state Potts model on a hexagonal lattice with the competing exchange interactions. Researches are carried out for the value of interaction of next-nearest neighbor in the range of 0.0≤r≤1.0. Taking into account of antiferromagnetic interaction of next-nearest neighbor is shown to lead to the violation of the magnetic ordering. The phase diagram of dependence of critical temperature on the value of interaction of next-nearest neighbor is plotted. Of the orders of phase transitions has been carried out. It is established that the phase transition of the first order is observed in the ranges of 0.0≤r≤0.2 and 0.7≤r≤1.0. In the range of 0.3≤r≤0.6 frustration are observed.

scholarly journals Gapped magnetic ground state in quantum spin liquid candidate κ-(BEDT-TTF)2Cu2(CN)3

Science ◽  
2021 ◽  
Vol 372 (6539) ◽  
pp. 276-279
Author(s):  
Björn Miksch ◽  
Andrej Pustogow ◽  
Mojtaba Javaheri Rahim ◽  
Andrey A. Bardin ◽  
Kazushi Kanoda ◽  
...  
Keyword(s):  
Ground State ◽  
Valence Bond ◽  
Exchange Interactions ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Systems ◽  
Exotic State ◽  
Magnetic Ground State ◽  
Millikelvin Temperatures ◽  
Quantum Spin Liquid

Geometrical frustration, quantum entanglement, and disorder may prevent long-range ordering of localized spins with strong exchange interactions, resulting in an exotic state of matter. κ-(BEDT-TTF)2Cu2(CN)3 is considered the prime candidate for this elusive quantum spin liquid state, but its ground-state properties remain puzzling. We present a multifrequency electron spin resonance (ESR) study down to millikelvin temperatures, revealing a rapid drop of the spin susceptibility at 6 kelvin. This opening of a spin gap, accompanied by structural modifications, is consistent with the formation of a valence bond solid ground state. We identify an impurity contribution to the ESR response that becomes dominant when the intrinsic spins form singlets. Probing the electrons directly manifests the pivotal role of defects for the low-energy properties of quantum spin systems without magnetic order.

scholarly journals Displacive structural phase transitions and the magnetic ground state of quadruple perovskite YMn7O12

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
R. D. Johnson ◽  
D. D. Khalyavin ◽  
P. Manuel ◽  
Y. Katsuya ◽  
M. Tanaka ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Ground State ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Magnetic Ground State

Magnetic Structural Studies of the Two Polymorphs of Li3Fe2(PO4)3:  Analysis of the Magnetic Ground State from Super-Super Exchange Interactions

2001 ◽  
Vol 13 (12) ◽  
pp. 4527-4536 ◽  
Author(s):  
Gwenaëlle Rousse ◽  
Juan Rodríguez-Carvajal ◽  
Calin Wurm ◽  
Christian Masquelier
Keyword(s):  
Ground State ◽  
Exchange Interactions ◽  
Structural Studies ◽  
Magnetic Ground State

scholarly journals Structure and phase transitions in A -site ordered RBaMn2O6 ( R=Pr,Nd ) perovskites with a polar ground state

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
J. Blasco ◽  
G. Subías ◽  
M. L. Sanjuán ◽  
J. L. García-Muñoz ◽  
F. Fauth ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Ground State ◽  
A Site

Magnetic Ground State and Electronic Structure Calculations of PbMnO3 Using DFT

2014 ◽  
Vol 895 ◽  
pp. 420-423 ◽  
Author(s):  
Sathya Sheela Subramanian ◽  
Baskaran Natesan
Keyword(s):  
Electronic Structure ◽  
Band Structure ◽  
Fermi Level ◽  
Ground State ◽  
Density Functional ◽  
Electronic Structure Calculations ◽  
Magnetic Ground State ◽  
Electronic Band ◽  
Structure Calculations ◽  
Centrosymmetric Structure

Structural optimization, magnetic ground state and electronic structure calculations of tetragonal PbMnO3have been carried out using local density approximation (LDA) implementations of density functional theory (DFT). Structural optimizations were done on tetragonal P4mm (non-centrosymmetric) and P4/mmm (centrosymmetric) structures using experimental lattice parameters and our results indicate that P4mm is more stable than P4/mmm. In order to determine the stable magnetic ground state of PbMnO3, total energies for different magnetic configurations such as nonmagnetic (NM), ferromagnetic (FM) and antiferromagnetic (AFM) were computed for both P4mm and P4/mmm structures. The total energy results reveal that the FM non-centrosymmetric structure is found to be the most stable magnetic ground state. The electronic band structure, density of states (DOS) and the electron localization function (ELF) were calculated for the stable FM structure. ELF revealed the distorted non-centrosymmetric structure. The band structure and DOS for the majority spins of FM PbMnO3showed no band gap at the Fermi level. However, a gap opens up at the Fermi level in minority spin channel suggesting that it could be a half-metal and a potential spintronic candidate.

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