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Propagation of defects in doped magnetic materials of different dimensionality

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Furrer A., Podlesnyak A., Krämer K. W., Embs J. P., Pomjakushin V., 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) 89(14)
Page(s) 144402 - 5
Title of proceedings Physical Review B
DOI 10.1103/physrevb.89.144402

Open Access

URL http://arxiv.org/abs/1406.0602
Type of Open Access Repository (Green Open Access)

Abstract

Defects intentionally introduced into magnetic materials often have a profound effect on the physical properties. Specifically tailored neutron spectroscopic experiments can provide detailed information on both the local exchange interactions and the local distances between themagnetic atoms around the defects. This is demonstrated for manganese dimer excitations observed for the magnetically diluted three- and two-dimensional compounds KMnxZn1−xF3 andK2MnxZn1−xF4, respectively. The resulting local exchange interactions deviate up to 10% from the average, and the local Mn-Mn distances are found to vary stepwise with increasing internal pressure due to the Mn/Zn substitution. Our analysis qualitatively supports 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.
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