TY - JOUR
T1 - Group theoretical treatment of the low-temperature phase transition of the Cd6Ca 1 1-cubic approximant
AU - Tamura, R.
AU - Edagawa, K.
AU - Shibata, K.
AU - Nishimoto, K.
AU - Takeuchi, S.
AU - Saitoh, K.
AU - Isobe, M.
AU - Ueda, Y.
PY - 2005/11/1
Y1 - 2005/11/1
N2 - An antiparallel orientational transition is reported for an intermetallic compound, i.e., Cd6Ca crystal, which is a 1 1-1 1-1 1 crystalline approximant to the icosahedral quasicrystal Cd5.7Ca. A group theoretical analysis based on the Landau theory predicts that the space group of the low-temperature phase is either C2 c or C2 m, in good agreement with the observations. Accordingly, two types of orientational orderings of Cd4 tetrahedra, which are located in the center of icosahedral clusters, may occur below 100K: In both cases, the Cd4 tetrahedra are orientationally ordered in an antiparallel fashion along the [110] direction of the high temperature body-centered-cubic phase. Such a transition in a metal is reminiscent of orientational transitions in molecular solids.
AB - An antiparallel orientational transition is reported for an intermetallic compound, i.e., Cd6Ca crystal, which is a 1 1-1 1-1 1 crystalline approximant to the icosahedral quasicrystal Cd5.7Ca. A group theoretical analysis based on the Landau theory predicts that the space group of the low-temperature phase is either C2 c or C2 m, in good agreement with the observations. Accordingly, two types of orientational orderings of Cd4 tetrahedra, which are located in the center of icosahedral clusters, may occur below 100K: In both cases, the Cd4 tetrahedra are orientationally ordered in an antiparallel fashion along the [110] direction of the high temperature body-centered-cubic phase. Such a transition in a metal is reminiscent of orientational transitions in molecular solids.
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U2 - 10.1103/PhysRevB.72.174211
DO - 10.1103/PhysRevB.72.174211
M3 - Article
AN - SCOPUS:29544438514
VL - 72
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 17
M1 - 174211
ER -