scholarly journals Observation of new magnetic ground state in frustrated quantum antiferromagnet spin-liquid system Cs2CuCl4

2017 ◽  
Vol 43 (8) ◽  
pp. 901-904 ◽  
Author(s):  
Hyeong-Jin Kim ◽  
C. R. S. Haines ◽  
C. Liu ◽  
Sae Hwan Chun ◽  
Kee Hoon Kim ◽  
...  
Keyword(s):  
Ground State ◽  
Liquid System ◽  
Spin Liquid ◽  
Magnetic Ground State ◽  
Quantum Antiferromagnet

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.

Competition between the singlet-spin liquid state and the magnetic ground state in a two-chain spin-½ antiferromagnetic ladder compound LaCuO2.5: ACu63NMR study

1996 ◽  
Vol 53 (18) ◽  
pp. R11942-R11945 ◽  
Author(s):  
S. Matsumoto ◽  
Y. Kitaoka ◽  
K. Ishida ◽  
K. Asayama ◽  
Z. Hiroi ◽  
...  
Keyword(s):  
Ground State ◽  
Liquid State ◽  
Spin Liquid ◽  
Magnetic Ground State ◽  
Spin Liquid 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 Survival of itinerant excitations and quantum spin state transitions in YbMgGaO4 with chemical disorder

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
X. Rao ◽  
G. Hussain ◽  
Q. Huang ◽  
W. J. Chu ◽  
N. Li ◽  
...  
Keyword(s):  
Spin State ◽  
Magnetic Ordering ◽  
Temperature Limit ◽  
Quantum Spin ◽  
Spin Fluctuations ◽  
State Transitions ◽  
Spin Liquid ◽  
Magnetic Ground State ◽  
Effective Spin ◽  
Ideal System

AbstractA recent focus of quantum spin liquid (QSL) studies is how disorder/randomness in a QSL candidate affects its true magnetic ground state. The ultimate question is whether the QSL survives disorder or the disorder leads to a “spin-liquid-like” state, such as the proposed random-singlet (RS) state. Since disorder is a standard feature of most QSL candidates, this question represents a major challenge for QSL candidates. YbMgGaO4, a triangular lattice antiferromagnet with effective spin-1/2 Yb3+ions, is an ideal system to address this question, since it shows no long-range magnetic ordering with Mg/Ga site disorder. Despite the intensive study, it remains unresolved as to whether YbMgGaO4 is a QSL or in the RS state. Here, through ultralow-temperature thermal conductivity and magnetic torque measurements, plus specific heat and DC magnetization data, we observed a residual κ0/T term and series of quantum spin state transitions in the zero temperature limit for YbMgGaO4. These observations strongly suggest that a QSL state with itinerant excitations and quantum spin fluctuations survives disorder in YbMgGaO4.

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.

scholarly journals Anomalous Magnetic Ground State in anLaAlO3/SrTiO3Interface Probed by Transport through Nanowires

2014 ◽  
Vol 113 (21) ◽  
Author(s):  
A. Ron ◽  
E. Maniv ◽  
D. Graf ◽  
J.-H. Park ◽  
Y. Dagan
Keyword(s):  
Ground State ◽  
Magnetic Ground State

scholarly journals Dichotomy in temporal and thermal spin correlations observed in the breathing pyrochlore LiGa1−xInxCr4O8

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Lee ◽  
S.-H. Do ◽  
W. Lee ◽  
Y. S. Choi ◽  
J. van Tol ◽  
...  
Keyword(s):  
Time Scale ◽  
Spin Dynamics ◽  
Muon Spin ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Fast Time ◽  
Spin Liquids ◽  
Magnetic Ground State ◽  
Spin Correlations ◽  
Magnetic Specific Heat

AbstractA breathing pyrochlore system is predicted to host a variety of quantum spin liquids. Despite tremendous experimental and theoretical efforts, such sought-after states remain elusive as perturbation terms and lattice distortions lead to magnetic order. Here, we utilize bond alternation and disorder to tune a magnetic ground state in the Cr-based breathing pyrochlore LiGa1−xInxCr4O8. By combining thermodynamic and magnetic resonance techniques, we provide experimental signatures of a spin-liquid-like state in x = 0.8, namely, a nearly T2-dependent magnetic specific heat and persistent spin dynamics by muon spin relaxation (μSR). Moreover, 7Li NMR, ZF-μSR, and ESR unveil the temporal and thermal dichotomy of spin correlations: a tetramer singlet on a slow time scale vs. a spin-liquid-like state on a fast time scale. Our results showcase that a bond disorder in the breathing pyrochlore offers a promising route to disclose exotic magnetic phases.

Crystallographic structure and magnetic ground state of CeSix

1992 ◽  
Vol 104-107 ◽  
pp. 657-658 ◽  
Author(s):  
H.M. Murphy ◽  
K.U. Neumann ◽  
D. Visser ◽  
K.R.A. Ziebeck
Keyword(s):  
Ground State ◽  
Crystallographic Structure ◽  
Magnetic Ground State
Sign in / Sign up

Export Citation Format

Share Document