Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximantReportar como inadecuado




Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximant - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 Ames Laboratory Ames, USA 2 SIMaP - Science et Ingénierie des Matériaux et Procédés 3 Tokyo University Sci. Dept. Sci. & Technol.

Abstract : It has generally been accepted that the orientational ordering of the Cd4 tetrahedron within the Cd6 R quasicrystal approximants is kinetically inhibited for R = Ho, Er, Tm and Lu by steric constraints. Our high-resolution X-ray scattering measurements of the Cd6Ho quasicrystal approximant, however, reveal an abrupt first-order transition to a monoclinic structure below T S = 178 K for samples that have -aged- at room temperature for approximately one year, reopening this question. Using X-ray resonant magnetic scattering at the Ho L 3-edge we have elucidated the nature of the antiferromagnetic ordering below T N = 8.5 K in Cd6Ho. The magnetic Bragg peaks are found at the charge forbidden H + K + L = 2n + 1 positions, referenced to the high-temperature body-centred cubic structure. In general terms, this corresponds to antiferromagnetic arrangements of the Ho moments on adjacent clusters in the unit cell as previously found for Cd6Tb.

keyword : quasicrystal approximant antiferromagnetism X-ray resonant magnetic scattering





Autor: A. Kreyssig - Guillaume Beutier - T. Hiroto - M.G. Kim - Gregory S. Tucker - Marc De Boissieu - R. Tamura - A.I. Goldman -

Fuente: https://hal.archives-ouvertes.fr/



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