Spiral ground state in the quasi-two-dimensional spin-1/2 system Cu2GeO4

Abstract

We apply density functional theory band structure calculations, the coupled-cluster method, and exact diagonalization to investigate the microscopic magnetic model of the spin-1/2 compound Cu2GeO4. The model is quasi-two-dimensional, with uniform spin chains along one direction and frustrated spin chains along the other direction. The coupling along the uniform chains is antiferromagnetic, J 130 K. The couplings along the frustrated chains are J1 -60 K and J2 80 K between nearest neighbors and next-nearest neighbors, respectively. The ground state of the quantum model is a spiral, with the reduced sublattice magnetization of 0.62 mu_B and the pitch angle of 84 deg, both renormalized by quantum effects. The proposed spiral ground state of Cu2GeO4 opens a way to magnetoelectric effects in this compound.

Extended version: 8 pages, 5 figures, 1 table

References in corpus (46)

• Thermodynamics of Spin S = 1/2 Antiferromagnetic Uniform and Alternating-Exchange Heisenberg Chains
• Neel Temperature of Quasi-Low-Dimensional Heisenberg Antiferromagnets
• Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7
• Tight-binding models for the new iron based superconductor materials
• Magnon pairing in quantum spin nematic
• Ground-state phases of the spin-1/2 J_1-J_2 Heisenberg antiferromagnet on the square lattice: A high-order coupled cluster treatment
• Numerical and approximate analytical results for the frustrated spin-1/2 quantum spin chain
• Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4
• Magnetocaloric effect in one-dimensional antiferromagnets
• NMR and LDA evidence for spiral magnetic order in the chain cuprate LiCu2O2
• Thermal conductivity via magnetic excitations in spin-chain materials
• Quantum $J_1$--$J_2$ antiferromagnet on the stacked square lattice: Influence of the interlayer coupling on the ground-state magnetic ordering
• Spin waves and magnetic interactions in LiCu2O2
• Chiral order and electromagnetic dynamics in one-dimensional multiferroic cuprates
• Enhanced magnetocaloric effect in frustrated magnetic molecules with icosahedral symmetry
• Multi-Chain Mean-Field Theory of Quasi One-Dimensional Quantum Spin Systems
• Helicoidal magnetic order in a clean copper oxide spin chain compound
• beta-Cu2V2O7: a spin-1/2 honeycomb lattice system
• Cupric chloride CuCl2 as an S=1/2 chain multiferroic
• Phase Transitions in the Spin-Half J_1--J_2 Model
• Quantum Phase Transitions of a Square-Lattice Heisenberg Antiferromagnet with Two Kinds of Nearest-Neighbour Bonds: A High-Order Coupled-Cluster Treatment
• Coupled Cluster Treatment of the Shastry-Sutherland Antiferromagnet
• Anisotropic pyrochlores and the global phase diagram of the checkerboard antiferromagnet
• Magnetic order in a spin-half interpolating square-triangle Heisenberg antiferromagnet
• High-Order Coupled Cluster Method Calculations for the Ground- and Excited-State Properties of the Spin-Half XXZ Model
• A Plane of Weakly Coupled Heisenberg Chains: Theoretical Arguments and Numerical Calculations
• The frustrated spin-1/2 J1-J2 Heisenberg ferromagnet on the square lattice: Exact diagonalization and Coupled-Cluster study
• Wannier functions and exchange integrals: The example of LiCu${}_2$O${}_2$
• Magnon BEC and various phases of 3D quantum helimagnets under high magnetic field
• The quantum $J_1$--$J_1^{\prime }$--$J_2$ spin-1 Heisenberg model: Influence of the interchain coupling on the ground-state magnetic ordering in 2D
• Sr2V3O9 and Ba2V3O9: quasi one-dimensional spin-systems with an anomalous low temperature susceptibility
• Halogen-mediated exchange in the coupled-tetrahedra quantum spin systems Cu2Te2O5X2 (X=Br,Cl)
• Coupled frustrated quantum spin-1/2 chains with orbital order in volborthite Cu3V2O7(OH)2(H2O)2
• Electronic structure and magnetic properties of the spin-1/2 Heisenberg system CuSe2O5
• Influence of an inter-chain coupling on spiral ground-state correlations in frustrated spin-1/2 J1-J2 Heisenberg chains
• 1-Dimensional behavior and sliding Luttinger liquid phase in a frustrated spin-1/2 crossed chain model: contribution of exact diagonalizations
• Large quantum fluctuations in the strongly coupled spin-1/2 chains of green dioptase: a hidden message from birds and trees
• Nonrelativistic Multiferroicity in the Nonstoichiometric Spin s=1/2 Spiral Chain Cuprate LiCu2O2
• Crystal water induced switching of magnetically active orbitals in CuCl2
• Multiferroicity due to nonstoichiometry in the chain cuprate LiVCuO_4
• Microscopic model of (CuCl)LaNb2O7: coupled spin dimers replace a frustrated square lattice
• Doped coupled frustrated spin-1/2 chains with four-spin exchange
• Ab initio modeling of Bose-Einstein condensation in Pb2V3O9
• Influence of quantum fluctuations on zero-temperature phase transitions between collinear and noncollinear states in frustrated spin systems
• Uniform spin chain physics arising from NCN bridges in CuNCN: surprises on the way from copper oxides to their nitride analogs
• Spiral correlations in frustrated one-dimensional spin-1/2 Heisenberg J1-J2-J3 ferromagnets

Cited by in corpus (6)

• Superposition of ferromagnetic and antiferromagnetic spin chains in the quantum magnet BaAg2Cu[VO4]2
• Unusual UUDD magnetic chain structure of the spin-1/2 tetragonally distorted spinel GeCu2O4
• The origin of up-up-down-down magnetic order in Cu${}_2$GeO${}_4$
• Multiferroicity in the frustrated spinel cuprate GeCu${}_2$O${}_4$
• Stabilization of high-pressure GeCu${}_2$O${}_4$ spinel cuprate with quasi-1D $S=1/2$ chains in the epitaxial thin-film form
• Epitaxial stabilization of thin films of the frustrated Ge-based spinels