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

Author

Listed:
  • K. Hagdorn
  • D. Hohlwein
  • J. Ihringer
  • K. Knorr
  • W. Prandl
  • H. Ritter
  • H. Schmid
  • Th. Zeiske

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

Suggested Citation

  • K. Hagdorn & D. Hohlwein & J. Ihringer & K. Knorr & W. Prandl & H. Ritter & H. Schmid & Th. Zeiske, 1999. "Canted antiferromagnetism and magnetoelastic coupling in metallic Ho 0.1 Ca 0.9 MnO 3," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 11(2), pages 243-254, September.
    • Handle: RePEc:spr:eurphb:v:11:y:1999:i:2:p:243-254:10.1007/s100510050935
    DOI: 10.1007/s100510050935
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