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Trigonal Lattice Distortion and Ferro-Quadrupole Ordering in Phase IV of Ce x La 1- x B 6 ( x = 0.75 and 0.70)

2003; Physical Society of Japan; Volume: 72; Issue: 2 Linguagem: Inglês

10.1143/jpsj.72.205

1347-4073

Mitsuhiro Akatsu, Terutaka Gotô, Yuichi Nemoto, Осаму Сузукі, Shintaro Nakamura, S. Kunii,

Magnetic Properties of Alloys

The low-temperature lattice effects of the Kondo compounds Ce x La 1- x B 6 ( x = 0.75 and 0.70) with a Γ 8 ground state have been investigated by dilatometric measurements. In an ordered phase IV below T C = 1.6 K (1.4 K) for x = 0.75 (0.70), the lattice length along the [001] direction reveals an increase, while the length along the [111] direction shows an appreciable decrease. This lattice distortion is described in terms of the trigonal strain < ε y z >= < ε z x >= < ε x y >≠0 with Γ 5 symmetry in addition to a volume expansion ε B = ε x x + ε y y + ε z z with full symmetry Γ 1 . The trigonal strain in phase IV indicates a ferro-quadrupole ordering of < O y z >= < O z x >= < O x y >≠0.