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Quadrupolar Interaction in NdB 6 Studied by Magnetostriction

1997; Physical Society of Japan; Volume: 66; Issue: 3 Linguagem: Inglês

10.1143/jpsj.66.548

1347-4073

Masafumi Sera, Sei-ichi Itabashi, S. Kunii,

Magnetic and transport properties of perovskites and related materials

Thermal expansion and longitudinal magnetostriction along the direction Δ l / l of NdB 6 have been measured in the magnetic field H along the z axis ( direction) up to 8 T. Below the Néel temperature T N , accompanying the spin-flop transition or domain rotation at 0.5 T, the z axis shrinks greatly. The thermal expansion in H =2.1 T, where the ordered moment is perpendicular to H , shows that the shrinkage of the z axis becomes smaller with increasing temperature and disappears at T N . The results were analyzed using a molecular field approximation and it was shown that it is necessary to introduce the ferro-quadrupolar interaction K 3 with a Γ 3 symmetry in NdB 6 . The difference in the thermal expansion in the paramagnetic region between CeB 6 and NdB 6 is discussed from the standpoint that there exists large antiferro-quadrupolar short-range ordering in CeB 6 .