Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6

Abstract

The compound BaCuSi2O6 is a quantum magnet with antiferromagnetic dimers of S = 1/2 moments on a quasi-2D square lattice. We have investigated its spin dynamics by inelastic neutron scattering experiments on single crystals with an energy resolution considerably higher than in an earlier study. We observe multiple magnon modes, indicating clearly the presence of magnetically inequivalent dimer sites. This more complex spin Hamiltonian leads to a distinct form of magnon Bose-Einstein condensate (BEC) phase with a spatially modulated condensate amplitude.

5 pages, 4 figures, to be published in Phys. Rev. Lett

References in corpus (14)

• Magnetization plateaus in spin chains: ``Haldane gap'' for half-integer spins
• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Coupled Ladders in a Magnetic Field
• Magnetic Superstructure in the Two-Dimensional Quantum Antiferromagnet SrCu2(BO3)2
• Magnetic Field-Induced Condensation of Triplons in Han Purple Pigment BaCuSi${}_2$O${}_6$
• Dimensional reduction at a quantum critical point
• Field- and pressure-induced magnetic quantum phase transitions in TlCuCl_3
• Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of TlCuCl3
• Temperature-dependent spin gap and singlet ground state in BaCuSi2O6
• Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6
• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Role of anisotropy in the spin-dimer compound BaCuSi2O6
• Low temperature structural phase transition and incommensurate lattice modulation in the spin gap compound BaCuSi2O6
• Microscopic model for the magnetization plateaus in NH4CuCl3

Cited by in corpus (47)

• Bose-Einstein Condensation in Magnetic Insulators
• Magnetic Cluster Excitations
• Field Induced Magnetic Ordering and Single-ion Anisotropy in the Quasi-1D Haldane Chain Compound SrNi2V2O8: A Single Crystal investigation
• Geometric Frustration and Dimensional Reduction at a Quantum Critical Point
• Magnetic excitations of the gapped quantum spin dimer antiferromagnet Sr${}_3$Cr${}_2$O${}_8$
• Ordered magnetic phases of the frustrated spin-dimer compound Ba3Mn2O8
• Magnetic frustration in BaCuSi2O6 released
• Nematic phase and phase separation near saturation field in frustrated ferromagnets
• Nematic and supernematic phases in Kagome quantum antiferromagnets under a magnetic field
• Theory of the field-induced BEC in the frustrated spin-1/2 dimer compound BaCuSi2O6
• NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSi${}_2$O${}_6$
• Magnetism of CuX2 frustrated chains (X = F, Cl, Br): the role of covalency
• Spin-chain magnetism and uniform Dzyaloshinsky-Moriya anisotropy in BaV${}_3$O${}_8$
• Nuclear Magnetic Resonance in High Magnetic Field: Application to Condensed Matter Physics
• Quantum phase transitions and dimensional reduction in antiferromagnets with inter-layer frustration
• Two energy scales of spin dimers in clinoclase Cu3(AsO4)(OH)3
• Magnetic excitations in the spin-trimer compounds Ca3Cu3-xNix(PO4)4 (x=0,1,2)
• Macroscopic properties of triplon Bose-Einstein condensates
• Phase separation versus supersolid behavior in frustrated antiferromagnets
• Reduced dimensionality in layered quantum dimer magnets: Frustration vs. inhomogeneous condensates
• Ab initio modeling of Bose-Einstein condensation in Pb2V3O9
• Nearly compensated exchange in the dimer compound callaghanite Cu${}_2$Mg${}_2$(CO${}_3$)(OH)${}_6$$\cdot$2H${}_2$O
• Field-induced bound-state condensation and spin-nematic phase in SrCu${}_2$(BO${}_3$)${}_2$ revealed by neutron scattering up to 25.9 T
• Revealing three-dimensional quantum criticality by Sr-substitution in Han Purple
• High-field instability of field-induced triplon Bose-Einstein condensate
• Quasi-two-dimensional Bose-Einstein condensation of spin triplets in dimerized quantum magnet Ba${}_2$CuSi${}_2$O${}_6$Cl${}_2$
• Spatially Resolved Magnetization in the Bose-Einstein Condensed State of BaCuSi2O6: Evidence for Imperfect Frustration
• Electron spin resonance and exchange paths in the orthorhombic dimer system Sr2VO4
• On Josephson effects in insulating spin systems
• Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in BaCuSi${}_2$O${}_6$
• Two types of adjacent dimer layers in the low temperature phase of BaCuSi2O6
• Theory of Magnetic Field-Induced Bose-Einstein Condensation of Triplons in Ba3Cr2O8
• Condensate-free superfluidity induced by frustrated proximity effect
• Competing Bose-Glass physics with disorder-induced Bose-Einstein condensation in the doped $S=1$ antiferromagnet Ni(Cl${}_{1-x}$Br${}_x$)${}_2$-4SC(NH${}_2$)${}_2$ at high magnetic fields
• Dynamics of the two-dimensional S=1/2 dimer system (C5H6N2F)2CuCl4
• Microscopic analysis of the magnetic form factor in low-dimensional cuprates
• Magnon Condensation in Dimerized Antiferromagnets with Spin-Orbit Coupling
• Crossover Behavior from Decoupled Criticality
• Finite-Temperature Transition in the Spin-Dimer Antiferromagnet BaCuSi2O6
• Bose-Einstein condensation in honeycomb dimer magnets and $\mathrm{Y}{\mathrm{b}}_2\mathrm{S}{\mathrm{i}}_2{\mathrm{O}}_7$
• Crystal growth with oxygen partial pressure of the $BaCuS{i}_2{O}_6$ and $B{a}_{1-x}S{r}_{x}CuS{i}_2{O}_6$ spin dimer compounds
• Floating Zone Growth of Sr Substituted Han Purple: Ba${}_{0.9}$Sr${}_{0.1}$CuSi${}_2$O${}_6$
• Unveiling a Family of Dimerized Quantum Magnets in Ternary Metal Borides
• Pair hopping in systems of strongly interacting hard-core bosons
• $K$ -edge and $L_3$ -edge RIXS study of columnar and staggered quantum dimer phases of the square lattice Heisenberg model
• Investigating field-induced magnetic order in Han Purple by neutron scattering up to 25.9 T
• Spin functional renormalization group for dimerized quantum spin systems