Powder neutron diffraction studies of structure and magnetic Ce ordering in the strongly correlated electron compound Ce{sub 0.75}La{sub 0.25}{sup 11}B{sub 6}

Journal Article · Fri Jul 01 04:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.72.014414· OSTI ID:20719109

Fischer, P ^[1]; Iwasa, K; Kunii, S ^[2]; Kuwahara, K; Kohgi, M ^[3]; Hansen, T ^[4]

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1. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, CH-5232 Villigen PSI (Switzerland)
2. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
3. Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan)
4. Institut Laue-Langevin, F-38042 Grenoble Cedex 9 (France)

By means of powder neutron diffraction investigations, chemical structure and magnetic Ce ordering of Ce{sub 0.75}La{sub 0.25}{sup 11}B{sub 6} have been investigated at temperatures down to 105 mK. In the antiferromagnetic low-temperature phase III Ce{sub 0.75}La{sub 0.25}{sup 11}B{sub 6} resembles pure CeB{sub 6}, but has a lower Neel temperature T{sub N} between 0.89 and 1.25 K. Similar to the recently determined magnetic ordering in pure CeB{sub 6} (model C), one obtains the compared to CeB{sub 6} smaller ordered magnetic Ce moments {mu}{sub Ce(1)}=0.53(1) {mu}{sub B} at z=0 and {mu}{sub Ce(2)}=0.12(1) {mu}{sub B} at z=1/2 with respect to the magnetic unit cell at 105 mK. Presumably this magnetic ordering, which is characterized by both propagation vectors k=[1/4,1/4,0] and k{sup '}=[1/4,1/4,1/2], is caused by competition between magnetic dipole and multipolar ordering. At 0.89 K the magnetic moments are reduced to {mu}{sub Ce(1)}=0.31(1){mu}{sub B} and {mu}{sub Ce(2)}=0.08(1){mu}{sub B}. At 1.25 K in phase IV with presumably multipolar Ce ordering no significant magnetic Bragg peaks associated with magnetic dipole Ce moments were observed, supporting the octupole model of Kubo and Kuramoto for this phase.

• OSTI ID: 20719109
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 1 Vol. 72; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
BRAGG CURVE
CERIUM BORIDES
ELECTRON CORRELATION
LANTHANUM COMPOUNDS
MAGNETIC DIPOLES
MAGNETIC MOMENTS
NEEL TEMPERATURE
NEUTRON DIFFRACTION
OCTUPOLES
POWDERS
TEMPERATURE DEPENDENCE
VECTORS