Canted antiferromagnetism and magnetoelastic coupling in metallic Ho 0.1 Ca 0.9 MnO 3

K. Hagdorn, D. Hohlwein, J. Ihringer, K. Knorr, W. Prandl (), H. Ritter, H. Schmid and Th. Zeiske

The European Physical Journal B: Condensed Matter and Complex Systems, 1999, vol. 11, issue 2, 243-254

Abstract: Ho 0.1 Ca 0.9 MnO 3 is a canted antiferromagnet with the magnetic space group Pn′ma′. The magnetic structure is a superposition C x F y A z of the three types of order allowed in Pn′ma′. In the Ca-rich corner of the system Ho 1−x Ca x MnO 3 the title compound has a strong magnetoelastic distortion ΔV MAG /V=1.2 × 10 −3 , the highest metallic conductivity and a ferromagnetic component F y close to the maximum in the series. Among the areas ab, bc, ca calculated from the lattice constants only ca shows a strong magnetoelastic effect below T N =106 K. The x-, y-, z-spin components depend differently on the temperature. This gives rise to spin rotation which is particularly strong close to T N . MnO 6 octahedra have short bond lengths with a temperature independent average 〈MnO〉=1.91 Å. They are practically regular at room temperature and show a Jahn-Teller distortion of 3.5% in the magnetically ordered state. Above T N we find small polaron conductivity. The presence of the Jahn-Teller distortion due to the only small abundance (10%) of Mn 3+ in the t 2g 3 e g configuration is attributed to delocalised e g electrons. In the magnetically ordered state the averaged magnetic moment of Mn is reduced appreciably from the paramagnetic value due to spin disorder. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Keywords: PACS. 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies; synchrotron-source x-ray scattering; etc.); 71.38.+i Polarons and electron-phonon interactions; 71.30.+h Metal-insulator transitions and other electronic transitions (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1007/s100510050935

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