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ID 18663
file
creator
Higaki, Haruhiro
Goshima, Hiroshi
Fujita, Toshizo
abstract
The ternary uranium compound UCu2Sn with a hexagonal ZrPt2Al-type structure shows a phase transition at 16 K. We reported previously that huge lattice softening is accompanied by the phase transition, which originates from ferroquadrupolar ordering of the ground-state nonKramers doublet Γ5. A macroscopic strain, which is expected to emerge spontaneously, was not detected by powder x-ray diffraction in the temperature range between 4.2 and 300 K. To search the spontaneous strain, we have carried out thermal expansion measurements on a single-crystalline sample along the a, b, and c axes using a capacitance technique with the resolution of 10-8. In the present experiment, we found the spontaneous exx-eyy strain, which couples to the ground state doublet Γ5. The effect of uniaxial pressure along the a, b, and c axes on the transition temperature is also discussed.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 68
issue
Issue 14
start page
144413-1
end page
144413-4
date of issued
2003-10-08
publisher
American Physical Society
issn
0163-1829
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2003 American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter