Abstract
A magnetic structure of the sawtooth-chain antiferromagnet hbox {Fe}_2hbox {Se}_2hbox {O}_7 was investigated by magnetization measurements, single crystalline and powder neutron diffraction experiments, and a further analysis on the Mössbauer spectra. These experiments revealed a nearly collinear antiferromagnetic structure with magnetic moments aligned along the b-axis, indicating dominant antiferromagnetic exchanges between Fe(1)–Fe(2) and Fe(2)–Fe(3) sites. The magnon dispersion relation derived from the linear spin wave approximation suggests the possible flat band nature of magnons.
Highlights
A magnetic structure of the sawtooth-chain antiferromagnet Fe2Se2O7 was investigated by magnetization measurements, single crystalline and powder neutron diffraction experiments, and a further analysis on the Mössbauer spectra
To confirm that a sawtooth antiferromagnetic chain is formed in Fe2Se2O7, we performed magnetization measurements, the single crystalline and powder neutron diffraction experiments, and reanalyzed the Mössbauer spectra
The magnetic structure indicates that the antiferromagnetic interactions between Fe(1) and Fe(2) sites and Fe(2) and Fe(3) sites dominate the magnetic structure, which is consistent with the expectation from the crystal structure[25]
Summary
A magnetic structure of the sawtooth-chain antiferromagnet Fe2Se2O7 was investigated by magnetization measurements, single crystalline and powder neutron diffraction experiments, and a further analysis on the Mössbauer spectra. The symmetric zigzag spin ladder model represents a spin chain with nearest ( J1 ) and next-nearest neighbor ( J2 ) magnetic interactions. The excitations associated with the magnetic order have been detected by the Raman scattering study[24] It is not so clear whether Fe2Se2O7 can be regarded as a sawtooth chain antiferromagnet due to its complicated crystal structure. To confirm that a sawtooth antiferromagnetic chain is formed in Fe2Se2O7 , we performed magnetization measurements, the single crystalline and powder neutron diffraction experiments, and reanalyzed the Mössbauer spectra. The magnetic structure revealed from these experiments is consistent with the formation of the sawtooth antiferromagnetic chain along the a-axis
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