Canted Antiferromagnetism and Magnetoelastic Coupling in Metallic Ho 0.1 Ca 0.9 MnO 3
The European physical journal B, Condensed matter physics/European physical journal B, Condensed matter and complex systems(1999)
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.
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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
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