Defect propagation in one-, two-, and three-dimensional compounds doped by magnetic atoms
- Paul Scherrer Inst., Villigen (Switzerland). Lab. for Neutron Scattering and Imaging
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Univ. of Bern, Bern (Switzerland)
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. In conclusion, 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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States) Spallation Neutron Source
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-00OR22725; AC05.00OR22725
- OSTI ID:
- 1163590
- Alternate ID(s):
- OSTI ID: 1180220
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 14; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Spin correlations near the percolation threshold in three-dimensional antiferromagnets
EXAFS analysis and reinvestigation of the structure of a defect-fluorite-type compound, Y{sub 3}TaO{sub 7}