Magnetic bound states in the quarter-filled ladder system ${\alpha }^{\prime }-Na{V}_2{O}_5$}

Abstract

Raman scattering in the quarter-filled spin ladder system alpha'-NaV_2O_5 shows in the dimerized singlet ground state ($T\le T_{SP}=35K$) an unexpected sequence of three magnetic bound states. Our results suggest that the recently proposed mapping onto an effective spin chain for $T>T_{SP}$ has to be given up in favor of the full topology and exchange paths of a ladder in the dimerized phase for $T<T_{SP}$. As the new ground state we propose a dynamic superposition of energetically nearly degenerate dimer configurations on the ladder.

arXiv comment5 pages, 4 figures, to be published in PRB, brief reports, Dec. 1998

References in corpus (11)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• NaV_2O_5 as a quarter-filled ladder compound
• Magnetic excitation spectrum of dimerized antiferromagnetic chains
• Experimental evidence for a spin-Peierls-transition in ${\alpha }^{\prime }-Na{V}_2{O}_5$
• Charged Magnons in NaV2O5
• Elementary Excitations in Dimerized and Frustrated Heisenberg Chains
• Raman, infrared and optical spectra of the spin-Peierls compound NaV_2O_5
• Frustration induced Raman scattering in CuGeO_3
• Effects of in-chain and off-chain substitutions on spin fluctuations in the spin-Peierls compound CuGeO_3
• Study of spin-Peierls transition in alpha'--NaV2O5 by infrared reflectivity
• Phase Diagram of the S = 1/2 Frustrated Coupled Ladder System

Cited by in corpus (17)

• Thermodynamics of Spin S = 1/2 Antiferromagnetic Uniform and Alternating-Exchange Heisenberg Chains
• Magnetic light scattering in low-dimensional quantum spin systems
• Collective Singlet Excitations and Evolution of Raman Spectral Weights in the 2D Spin Dimer Compound SrCu2(BO3)2
• Magnetism of a tetrahedral cluster spin-chain
• Spin gap behavior and charge ordering in α^{\prime}-NaV_2O_5 probed by light scattering
• Optical spectroscopic study of the interplay of spin and charge in NaV2O5
• Electron-phonon and spin-phonon coupling in NaV${}_2$O${}_5$: charge fluctuations effect
• Low energy excitations and dynamic Dzyaloshinskii-Moriya interaction in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$ studied by far infrared spectroscopy
• Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
• Spectrum of elementary and collective excitations in the dimerized S=1/2 Heisenberg chain with frustration
• First evidence for charge ordering in NaV${}_2$O${}_5$ from Raman spectroscopy
• Spin-Peierls transition in NaV2O5 in high magnetic fields
• Low-energy excitations in NaV2O5
• Low Energy Singlets in the Excitation Spectrum of the Spin Tetrahedra System Cu_2Te_2O_5Br_2
• Quantum Spin Systems: From Spin Gaps to Pseudo Gaps
• Semi-Dirac spin liquids and frustrated quantum magnetism on the trellis lattice
• Terahertz light driven coherent excitation of a zone-folded Raman-active phonon mode in the Spin-Ladder System ${\alpha }^{\prime }$-NaV${}_2$O${}_5$