Eur. Phys. J. B 11, 243-254 (1999)
https://doi.org/10.1007/s100510050935

Canted antiferromagnetism and magnetoelastic coupling in metallic Ho_0.1Ca_0.9MnO₃

¹ Institut für Kristallographie, Universität Tübingen, Charlottenstrasse 33, 72070 Tübingen, Germany
² Hahn-Meitner-Institut, Glienicker Strasse 100, 14109 Berlin, Germany

Corresponding author: ^a wolfram.prandl@uni-tuebingen.de

Received: 21 January 1999
Published online: 15 September 1999

Abstract

is a canted antiferromagnet with the magnetic space group . The magnetic structure is a superposition of the three types of order allowed in . In the Ca-rich corner of the system the title compound has a strong magnetoelastic distortion , the highest metallic conductivity and a ferromagnetic component 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 . The x-, y-, z-spin components depend differently on the temperature. This gives rise to spin rotation which is particularly strong close to . octahedra have short bond lengths with a temperature independent average . They are practically regular at room temperature and show a Jahn-Teller distortion of 3.5% in the magnetically ordered state. Above we find small polaron conductivity. The presence of the Jahn-Teller distortion due to the only small abundance (10% ) of in the configuration is attributed to delocalised electrons. In the magnetically ordered state the averaged magnetic moment of Mn is reduced appreciably from the paramagnetic value due to spin disorder.