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Title: Antiferromagnetic order and the structural order-disorder transition in the Cd 6Ho quasicrystal approximant

Abstract

It has generally been accepted that the orientational ordering of the Cd 4 tetrahedron within the Cd 6 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 Cd 6Ho 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 Cd 6Ho. 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 Cd 6Tb.

Authors:
; ; ; ; ; ; ;  [1];  [2];  [2]
  1. CNRS-UMR
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1091412
Resource Type:
Journal Article
Journal Name:
Philos. Mag. Lett.
Additional Journal Information:
Journal Volume: 93; Journal Issue: (9) ; 2013
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Kreyssig, Andreas, Beutier, Guillaume, Hiroto, Takanobu, Kim, Min Gyu, Tucker, Gregory S., de Boissieu, Marc, Tamura, Ryuji, Goldman, Alan I., Ames), and Tokyo U). Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximant. United States: N. p., 2014. Web. doi:10.1080/09500839.2013.815375.
Kreyssig, Andreas, Beutier, Guillaume, Hiroto, Takanobu, Kim, Min Gyu, Tucker, Gregory S., de Boissieu, Marc, Tamura, Ryuji, Goldman, Alan I., Ames), & Tokyo U). Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximant. United States. doi:10.1080/09500839.2013.815375.
Kreyssig, Andreas, Beutier, Guillaume, Hiroto, Takanobu, Kim, Min Gyu, Tucker, Gregory S., de Boissieu, Marc, Tamura, Ryuji, Goldman, Alan I., Ames), and Tokyo U). Mon . "Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximant". United States. doi:10.1080/09500839.2013.815375.
@article{osti_1091412,
title = {Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximant},
author = {Kreyssig, Andreas and Beutier, Guillaume and Hiroto, Takanobu and Kim, Min Gyu and Tucker, Gregory S. and de Boissieu, Marc and Tamura, Ryuji and Goldman, Alan I. and Ames) and Tokyo U)},
abstractNote = {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.},
doi = {10.1080/09500839.2013.815375},
journal = {Philos. Mag. Lett.},
number = (9) ; 2013,
volume = 93,
place = {United States},
year = {2014},
month = {9}
}