TY - JOUR
T1 - Critical Slowing Down in Zn-Mg-Ho Quasicrystal
AU - Sugiyama, Jun
AU - Nozaki, Hiroshi
AU - Ansaldo, Eduardo J.
AU - Morris, Gerald D.
AU - Brewer, Jess H.
AU - Sato, Taku J.
N1 - Funding Information:
We thank S.R. Kreitzman, B. Hitti, D.J. Arseneau of TRIUMF, S. Stubbs of UBC, and P. Russo of Columbia Univ. for help with the μ+SR experiments. We specially thank D. R. Noakes for advising the experimental setup and U. Mizutani of Toyota Phys.&Chem. Res. Inst. for discussion. This work was partially (JHB) supported at UBC by CIAR, NSERC of Canada, and at TRIUMF by NRC of Canada.
Publisher Copyright:
© 2012 Published by Elsevier B.V.
PY - 2012
Y1 - 2012
N2 - By means of longitudinal field muon-spin spectroscopy, we have found a clear critical slowing down caused by spin fluctuation of Ho moments in the icosahedral quasicrystal (QC), i-ZnMgHo, with freezing temperature (Tf =1.95 K), for which the susceptibility showed an anomaly at5K. The difference is attributed to crystalline elec-tric field (CEF) effects. The muons experience a broad, fluctuating, field distribution, of width Δ ∼6.3 T around Tf. The effect of the CEF is also apparent in zero field and weak applied transverse field measurements, with an onset around 60 K. For the Cd-based QCs (CdMgHo and CdMgGd), which exhibited two freezing temperatures in the susceptibility, the change in fluctuation rate, i.e. freezing, occurs at the lower Tf.
AB - By means of longitudinal field muon-spin spectroscopy, we have found a clear critical slowing down caused by spin fluctuation of Ho moments in the icosahedral quasicrystal (QC), i-ZnMgHo, with freezing temperature (Tf =1.95 K), for which the susceptibility showed an anomaly at5K. The difference is attributed to crystalline elec-tric field (CEF) effects. The muons experience a broad, fluctuating, field distribution, of width Δ ∼6.3 T around Tf. The effect of the CEF is also apparent in zero field and weak applied transverse field measurements, with an onset around 60 K. For the Cd-based QCs (CdMgHo and CdMgGd), which exhibited two freezing temperatures in the susceptibility, the change in fluctuation rate, i.e. freezing, occurs at the lower Tf.
KW - Amorphous and quasicrystalline magnetic materials
KW - Critical-point effects
KW - Muon-spin rotation and relaxation
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U2 - 10.1016/j.phpro.2012.04.071
DO - 10.1016/j.phpro.2012.04.071
M3 - Conference article
AN - SCOPUS:84978473820
VL - 30
SP - 194
EP - 197
JO - Physics Procedia
JF - Physics Procedia
SN - 1875-3892
T2 - 12th International Conference on Muon Spin Rotation, Relaxation and Resonance, muSR 2011
Y2 - 16 May 2011 through 20 May 2011
ER -