Bound magnetic polarons in-type
Physical Review B - Condensed Matter and Materials Physics, ISSN: 1550-235X, Vol: 56, Issue: 11, Page: 6673-6680
1997
- 98Citations
- 32Captures
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Article Description
Bound magnetic polarons (BMP’s) in (Formula presented)-type (Formula presented) were investigated using magnetization measurements. The magnetization (Formula presented) was studied from 2 to 60 K in magnetic fields up to 55 kOe. The data show the characteristic features of BMP’s in the collective regime. In addition, the onset of antiferromagnetic order in the “matrix” surrounding the BMP’s leads to anomalies in the BMP susceptibility at the Néel temperature of the matrix (Formula presented) K. Below 15 K the low-field magnetization of the BMP’s is quite anisotropic. A detailed analysis of the isothermal magnetization curves, based on Wolff’s work but with some additional assumptions, separates the BMP contributions to (Formula presented) from the contribution of the matrix. The analysis gives the spontaneous moment (Formula presented) of a single BMP as a function of temperature (Formula presented), and the concentration (Formula presented) of BMP’s. The value (Formula presented) Bohr magnetons/BMP at the lowest temperatures is consistent with the expected radius of the hole orbit, of order 10 Å. The observed (Formula presented) dependence of (Formula presented) is compared with theoretical calculations based on a model that assumes that the wave function in the absence of the (Formula presented)-(Formula presented) interaction is hydrogenic. The calculated decrease of (Formula presented) with increasing (Formula presented) is somewhat slower than that deduced from the experimental data. The BMP concentration (Formula presented), from an analysis of the magnetization data, is about (Formula presented) BMP/cm(Formula presented) in all the samples. This (Formula presented) is consistent with the observed hopping conductivity at low temperatures. High-field magnetization data, up to 300 kOe, show the canted-to-paramagnetic phase transition of the matrix. At 1.4 K the transition is near 225 kOe. © 1997 The American Physical Society.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0001650155&origin=inward; http://dx.doi.org/10.1103/physrevb.56.6673; https://link.aps.org/doi/10.1103/PhysRevB.56.6673; http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.56.6673/fulltext; http://link.aps.org/article/10.1103/PhysRevB.56.6673
American Physical Society (APS)
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