Coexistence of double alternating antiferromagnetic chains in: NMR study
- 1 September 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 60 (9), 6731-6739
- https://doi.org/10.1103/physrevb.60.6731
Abstract
Nuclear magnetic resonance (NMR) of and nuclei has been measured in a spin-1/2 alternating-chain compound By analyzing the temperature variation of the NMR spectra, we have found that has two independent spin components with different spin-gap energies. The spin gaps are determined from the temperature dependence of the shifts at and sites to be 35 K and 68 K, which are in excellent agreement with those observed in the recent inelastic neutron scattering experiments [A.W. Garrett et al., Phys. Rev. Lett. 79, 745 (1997)]. This suggests that is composed of two magnetic subsystems showing distinct magnetic excitations, which are associated with the two crystallographically inequivalent V chains running along the b axis. The difference of the spin-gap energies between the chains is attributed to the small differences in the V-V distances, which may result in the different exchange alternation in each magnetic chain. The exchange interactions in each alternating chain are estimated and are discussed based on the empirical relation between the exchange interaction and the interatomic distance.
Keywords
This publication has 23 references indexed in Scilit:
- A new model to describe the physics ofZeitschrift für Physik B Condensed Matter, 1999
- Erratum: Magnetic excitation spectrum of dimerized antiferromagnetic chains [Phys. Rev. B54, R9624 (1996)]Physical Review B, 1998
- Magnetic Excitations in theAlternating Chain CompoundPhysical Review Letters, 1997
- Excitation Spectrum and Superexchange Pathways in the Spin DimerPhysical Review Letters, 1997
- 31P-NMR Study of Low-Energy Spin Excitations in Spin Ladder(VO)2P2O7and Spin DimerVO(HPO4)0.5H2OSystemsJournal of the Physics Society Japan, 1996
- Structure of (VO)2P2O7Materials Research Bulletin, 1995
- Inelastic Neutron Scattering from the Spin Ladder CompoundPhysical Review Letters, 1994
- Susceptibility and excitation spectrum of (VO in ladder and dimer-chain modelsPhysical Review B, 1994
- Synthetic pathways to vanadyl phosphatesSolid State Ionics, 1989
- Magnetic susceptibility of (VO: A one-dimensional spin-1/2 Heisenberg antiferromagnet with a ladder spin configuration and a singlet ground statePhysical Review B, 1987