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 Materializing rival ground states in the barlowite family of kagome magnets: quantum spin liquid, spin ordered, and valence bond crystal states

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Rebecca W. Smaha ◽  
Wei He ◽  
Jack Mingde Jiang ◽  
Jiajia Wen ◽  
Yi-Fan Jiang ◽  
...  
Keyword(s):  
Valence Bond ◽  
Ground States ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Liquid

scholarly journals Field-induced instability of the quantum spin liquid ground state in the Jeff=12 triangular-lattice compound NaYbO2

2019 ◽  
Vol 99 (18) ◽  
Author(s):  
K. M. Ranjith ◽  
D. Dmytriieva ◽  
S. Khim ◽  
J. Sichelschmidt ◽  
S. Luther ◽  
...  
Keyword(s):  
Triangular Lattice ◽  
Ground State ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Liquid

ROLE OF FRUSTRATION IN MAGNETISM AND THERMODYNAMIC PROPERTIES OF YMn2 AND β-Mn

1993 ◽  
Vol 07 (01n03) ◽  
pp. 1008-1012 ◽  
Author(s):  
M. SHIGA ◽  
K. YOSHIMOTO ◽  
H. NAKAMURA ◽  
H. WADA
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Ground State ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Liquid

The temperature dependence of the magnetic susceptibility, the specific heat and the electrical resistivity of Y(Sc) (Mn1−xAlx)2 and β-Mn1−xAlx systems has been measured. It is shown that the ground state for x=0 is not a simple Pauli paramagnet but may be regarded as a quantum spin liquid. The substitution of Al for Mn results in the spin glass freezing. The role of frustration is discussed for understanding these phenomena.

scholarly journals From magnetic order to quantum disorder in the Zn-barlowite series of S = 1/2 kagomé antiferromagnets

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Katherine Tustain ◽  
Brendan Ward-O’Brien ◽  
Fabrice Bert ◽  
Tianheng Han ◽  
Hubertus Luetkens ◽  
...  
Keyword(s):  
Long Range ◽  
Ground State ◽  
Density Functional ◽  
Magnetic Order ◽  
Parent Compound ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Range Magnetic Order ◽  
Quantum Spin Liquid ◽  
Long Range Magnetic Order

Abstract We report a comprehensive muon spectroscopy study of the Zn-barlowite series of $$S=\frac{1}{2}$$ S = 1 2 kagomé antiferromagnets, ZnxCu4−x(OH)6FBr, for x = 0.00 to 0.99(1). By combining muon spin relaxation and rotation measurements with state-of-the-art density-functional theory muon-site calculations, we observe the formation of both μ–F and μ–OH complexes in Zn-barlowite. From these stopping sites, implanted muon spins reveal the suppression of long-range magnetic order into a possible quantum spin liquid state upon the increasing concentration of Zn-substitution. In the parent compound (x = 0), static long-range magnetic order below TN = 15 K manifests itself in the form of spontaneous oscillations in the time-dependent muon asymmetry signal consistent with the dipolar fields expected from the calculated muon stopping sites and the previously determined magnetic structure of barlowite. Meanwhile, in the x = 1.0 end-member of the series—in which antiferromagnetic kagomé layers of Cu2+$$S=\frac{1}{2}$$ S = 1 2 moments are decoupled by diamagnetic Zn2+ ions—we observe that dynamic magnetic moment fluctuations persist down to at least 50 mK, indicative of a quantum disordered ground state. We demonstrate that this crossover from a static to dynamic magnetic ground state occurs for compositions of Zn-barlowite with x > 0.5, which bears resemblance to the dynamical behaviour of the widely studied Zn-paratacamite series that contains the quantum spin liquid candidate herbertsmithite.

scholarly journals Muon Spin Relaxation Evidence for the U(1) Quantum Spin-Liquid Ground State in the Triangular AntiferromagnetYbMgGaO4

2016 ◽  
Vol 117 (9) ◽  
Author(s):  
Yuesheng Li ◽  
Devashibhai Adroja ◽  
Pabitra K. Biswas ◽  
Peter J. Baker ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Ground State ◽  
Muon Spin ◽  
Muon Spin Relaxation ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Liquid

scholarly journals Quantum spin liquids

Science ◽  
2020 ◽  
Vol 367 (6475) ◽  
pp. eaay0668 ◽  
Author(s):  
C. Broholm ◽  
R. J. Cava ◽  
S. A. Kivelson ◽  
D. G. Nocera ◽  
M. R. Norman ◽  
...  
Keyword(s):  
Ground State ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Spin Liquids ◽  
Quantum Phases ◽  
Quantum Spin Liquids ◽  
The Past ◽  
Quantum Spin Liquid ◽  
Single Material ◽  
Topological Character

Spin liquids are quantum phases of matter with a variety of unusual features arising from their topological character, including “fractionalization”—elementary excitations that behave as fractions of an electron. Although there is not yet universally accepted experimental evidence that establishes that any single material has a spin liquid ground state, in the past few years a number of materials have been shown to exhibit distinctive properties that are expected of a quantum spin liquid. Here, we review theoretical and experimental progress in this area.

scholarly journals Quantum spin liquid ground state in the disorder free triangular lattice NaYbS2

2019 ◽  
Vol 100 (24) ◽  
Author(s):  
R. Sarkar ◽  
Ph. Schlender ◽  
V. Grinenko ◽  
E. Haeussler ◽  
Peter J. Baker ◽  
...  
Keyword(s):  
Triangular Lattice ◽  
Ground State ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Liquid

scholarly journals Topological phase transition and single/multi anyon dynamics of Z2 spin liquid

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Zheng Yan ◽  
Yan-Cheng Wang ◽  
Nvsen Ma ◽  
Yang Qi ◽  
Zi Yang Meng
Keyword(s):  
Quantum Monte Carlo ◽  
Dynamic Properties ◽  
Valence Bond ◽  
Quantum Spin ◽  
Monte Carlo Algorithm ◽  
Spin Liquid ◽  
Many Body ◽  
Excitation Spectra ◽  
Generic Solution ◽  
Quantum Spin Liquid

AbstractAmong the quantum many-body models that host anyon excitation and topological orders, quantum dimer models (QDM) provide a suitable playground for studying the relation between single-anyon and multi-anyon continuum spectra. However, as the prototypical correlated system with local constraints, the generic solution of QDM at different lattice geometry and parameter regimes is still missing due to the lack of controlled methodologies. Here we obtain, via sweeping cluster quantum Monte Carlo algorithm, the excitation spectra in different phases of the triangular lattice QDM. Our results reveal the single vison excitations inside the Z2 quantum spin liquid (QSL) and its condensation towards the $$\sqrt{12}\times \sqrt{12}$$ 12 × 12 valence bond solid (VBS), and demonstrate the translational symmetry fractionalization and emergent O(4) symmetry at the QSL-VBS transition. We find the single vison excitations, whose convolution qualitatively reproduces the dimer spectra, are not free but subject to interaction effects throughout the transition. The nature of the VBS with its O(4) order parameters are unearthed in full scope. Our approach opens the avenue for generic solution of the static and dynamic properties of QDMs and has relevance towards the realization and detection of fractional excitations in programmable quantum simulators.

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