Lattice structural change at ferromagnetic transition in Nd2MO2O7

Authors
Xu, S Moritomo, Y Oikawa, K Kamiyama, T Nakamura, A
Citation
S. Xu et al., Lattice structural change at ferromagnetic transition in Nd2MO2O7, J PHYS JPN, 70(8), 2001, pp. 2239-2241
Citations number
17
Categorie Soggetti
Physics
Journal title
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
ISSN journal
00319015 → ACNP
Volume
70
Issue
8
Year of publication
2001
Pages
2239 - 2241
Database
ISI
SICI code
0031-9015(200108)70:8<2239:LSCAFT>2.0.ZU;2-3
Abstract
The temperature dependence of the structural parameters is investigated in ferromagnetic Mo pyrochlore Nd2Mo2O7, by means of high-resolution time-of-f light (TOF) neutron powder diffraction measurement. The Mo-O-Mo bond angle theta abruptly increases and the Mo-O bond length d decreases with the decr ease of the temperature across the ferromagnetic transition temperature (T- C = 97 K). This structural variation suggests that itinerant carriers media te the ferromagnetic coupling between Mo spins via the double-exchange mech anism.