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Microscopic State of Low Doped Manganites La1 − xSrxMnO3 Probed by ESR |
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| Authors: | V. A. Ivanshin M. V. Eremin J. Deisenhofer H.-A. Krug von Nidda A. Loidl R. M. Eremina |
| Affiliation: | 1. MRS Laboratory, Kazan State University, 420008, Kazan, Russia 2. Max-Planck-Institut für Chemische Physik fester Stoffe, 01187, Dresden, Germany 3. Experimentalphysik V, EKM, Institut für Physik, 86135, Augsburg, Germany 4. E.K. Zavoisky Physical–Technical Institute, 420029, Kazan, Russia |
| Abstract: | The electron spin resonance (ESR) measurements were performed in single crystals of La1 ? x Sr x MnO3 (0.05 ≤ x ≤ 0.125) in order to study the interplay of crystal field, Dzyaloshinsky–Moriya interaction, Jahn–Teller (JT) effect, and orbital order. The angular dependence of the ESR linewidth of an untwinned La0.95Sr0.05MnO3 single crystal has been analyzed in the high-temperature approximation, which takes into account the microscopic geometry of the four nonequivalent Mn positions in the orthorhombic unit cell. A strong mixing of the |3z 2 ? r 2> and |x 2 ? y 2> states for the real orbital configuration was found. Magnetic inhomogeneities observed in the ESR spectra across the composition range 0.075 ≤ x ≤ 0.125 can be attributed to the presence of ferromagnetic clusters (magnetic spin polarons) in the paramagnetic state. New polaronic models are proposed. |
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