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Spin-Peierls instability of the U(1) Dirac spin liquid.
Nat Commun
August 2024
Technical University of Munich, TUM School of Natural Sciences, Physics Department, Garching, Germany.
Quantum fluctuations can inhibit long-range ordering in frustrated magnets and potentially lead to quantum spin liquid (QSL) phases. A prime example are gapless QSLs with emergent U(1) gauge fields, which have been understood to be described in terms of quantum electrodynamics in 2+1 dimension (QED). Despite several promising candidate materials, however, a complicating factor for their realisation is the presence of other degrees of freedom.
View Article and Find Full Text PDFQuantum Liquid States of Spin Solitons in a Ferroelectric Spin-Peierls State.
Phys Rev Lett
March 2024
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
In this study, we performed high-magnetic-field magnetization, dielectric, and ultrasound measurements on an organic salt showing a ferroelectric spin-Peierls (FSP) state, which is in close proximity to a quantum critical point. In contrast to the sparsely distributed gaslike spin solitons typically observed in conventional spin-Peierls (SP) states, the FSP state exhibits dense liquidlike spin solitons resulting from strong quantum fluctuations, even at low fields. Nevertheless, akin to conventional SP systems, a magnetic-field-induced transition is observed in the FSP state.
View Article and Find Full Text PDFQuasi-2D spin-Peierls transition through interstitial anionic electrons in K(NH).
Sci Bull (Beijing)
April 2024
National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. Electronic address:
Electron-phonon interactions and electron-electron correlations represent two crucial facets of condensed matter physics. For instance, in a half-filled spin-1/2 anti-ferromagnetic chain, the lattice dimerization induced by electron-nucleus interaction can be intensified by onsite Coulomb repulsion, resulting in a spin-Peierls state. Through first-principles calculations and crystal structure prediction methods, we have identified that under mild pressures, potassium and ammonia can form stable compounds: R3¯m K(NH), Pm3¯m K(NH), and Cm K(NH).
View Article and Find Full Text PDFHysteretic Room-Temperature Magnetic Bistability of the Crystalline 4,7-Difluoro-1,3,2-Benzodithiazolyl Radical.
Chempluschem
June 2024
Vorozhtsov Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia.
The title radical R⋅, synthesized by reduction of the corresponding cation R, is thermally stable up to ~380 K in the crystalline state under anaerobic conditions. With SQUID magnetometry, single-crystal and powder XRD, solid-state EPR and TG-DSC, reversible spin-Peierls transition between diamagnetic and paramagnetic states featuring ~10 K hysteretic loop is observed for R⋅ in the temperature range ~310-325 K; ΔH=~2.03 kJ mol and ΔS=~6.
View Article and Find Full Text PDFRole of V-V dimerization on electronic and magnetic properties of ilmenite-type CoVO.
J Phys Condens Matter
September 2023
Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, People's Republic of China.
Structural, electronic and magnetic properties of ilmenite-type CoVOhave been explored via the generalized gradient approximation + effective Hubbardcorrection, in the framework of density functional theory. Our results indicate that high temperature rhombohedralR3-phase is metallic with oxidation states and electronic configurations Co(t2g↑3eg↑2t2g↓2eg↓0), V(t2g↑1eg↑0t2g↓0eg↓0), respectively, while low temperature triclinicP1-phase, induced from spin-Peierls transition in the V-V dimerization manner, is insulating, maintaining charge and electronic states unchanged. Furthermore, the A-type antiferromagnetic ordering, where the ferromagnetic honeycomb layers are anti-aligned along the stacking axis, is identified to be the magnetic ground state for the low temperature phase, in nice agreement with experimental findings, analogous to CoTiO.
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