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Defect propagation in one-, two-, and three-dimensional compounds doped by magnetic atoms

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Furrer A., Podlesnyak A., Krämer K. W., Strässle Th.,
Project Dimensional and Anisotropy Control of Model Quantum Magnets
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 90(14)
Page(s) 144434 - 6
Title of proceedings Physical Review B
DOI 10.1103/physrevb.90.144434

Open Access

URL https://arxiv.org/abs/1410.6617
Type of Open Access Repository (Green Open Access)

Abstract

Inelastic neutron scattering experiments were performed to study manganese(II) dimer excitations in the diluted one-, two-, and three-dimensional compounds CsMnxMg1−xBr3, K2MnxZn1−xF4, and KMnxZn1−xF3 (x 0.10), respectively. The transitions from the ground-state singlet to the excited triplet, split into a doublet and a singlet due to the single-ion anisotropy, exhibit remarkable fine structures. These unusual features are attributed to local structural inhomogeneities induced by the dopant Mn atoms, which act like lattice defects. Statistical models support the theoretically predicted decay of atomic displacements according to 1/r2, 1/r, and constant (for three-, two-, and one-dimensional compounds, respectively) where r denotes the distance of the displaced atoms from the defect. The observed fine structures allow a direct determination of the local exchange interactions J , and the local intradimer distances R can be derived through the linear law dJ/dR.
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