Spin Dynamics in the Magnetic Chains Arrays of Sr14Cu24O41: a Neutron Inelastic scattering Investigation

Abstract

Below about 150 K, the spin arrangement in the chain arrays of Sr14Cu24O41 is shown to develop in two dimensions (2D). Both the correlations and the dispersion of the observed elementary excitations agree well with a model of interacting dimers. Along the chains, the intra- and inter-dimer distances are equal to 2 and about 3 times the distance (c) between neighboring Cu ions. While the intra-dimer coupling is J about 10 meV, the inter-dimer couplings along and between the chains are of comparable strenght, J// about -1.1 meV and Jperp about 1.7 meV, respectively. This remarkable 2D arrangement satisfies the formal Cu valence of the undoped compound. Our data suggest also that it is associated with a relative sliding of one chain with respect to the next one, which, as T decreases, develops in the chain direction. A qualitative analysis shows that nearest inter-dimer spin correlations are ferromagnetic, which, in such a 2D structure, could well result from frustration effects.

4 pages, 5 figures, submitted to Phys.Rev.B, date of receipt 29 June 1998

References in corpus (3)

• The Spin Dynamics of the Spin Ladder, Dimer Chain Material Sr14Cu24O41
• Absence of spin gap in the superconducting ladder compound Sr_2Ca_{12}Cu_{24}O_{41}
• Magnetic excitations and structural change in the S=1/2 quasi-one-dimensional magnet Sr_{14-x}Y_{x}Cu_{24}O_{41} (0<x<1)

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• Interchain interactions and magnetic properties of Li2CuO2
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• Weak coupling of pseudoacoustic phonons and magnon dynamics in incommensurate spin ladder compound Sr14Cu24O41
• Structural Evolution of One-dimensional Spin Ladder Compounds Sr14-xCaxCu24O41 with Ca doping and Related Hole Redistribution Evidence
• Charge order induced sharp Raman peak in Sr_14Cu_24O_41
• Field-Induced Quantum Criticality of Systems with Ferromagnetically Coupled Structural Spin Units
• Quenched charge disorder in CuO2 spin chains: Experimental and numerical studies
• Magnetisation of hole-doped CuO2 spin chains in Sr14-xCaxCu24O41
• Effects of hole-doping on the magnetic ground state and excitations in the edge-sharing CuO${}_2$ chains of Ca${}_{2+x}$Y${}_{2-x}$Cu${}_5$O${}_{10}$
• Macroscopic Quantum Coherence of the Spin Triplet in the Spin-Ladder Compound Sr14Cu24O41
• $Sr\_14Cu\_24O\_41$ : a complete model for the chain sub-system
• Hole-depletion of ladders in Sr${}_{14}$Cu${}_{24}$O${}_{41}$ induced by correlation effects
• Non-classicality of spin structures in condensed matter: An analysis of Sr${}_{14}$Cu${}_{24}$O${}_{41}$
• Magneto-optic far-infrared study of Sr${}_{14}$Cu${}_{24}$O${}_{41}$: triplet excitations in chains
• Exact diagonalization studies of doped Heisenberg spin rings
• Strong Coulomb effects in hole-doped Heisenberg chains
• ESR study of (Sr,La,Ca)_{14}Cu_{24}O_{41}