235 citations · 610 across the 17 of their papers we have counts for
17 papers
Variation of Pressure-Induced Valence Transition with Approximation Degree in Yb-Based Quasicrystalline Approximants
Keiichiro Imura, Yuki Yoneyama, Hideyuki Ando +6
We have synthesized new Tsai-type Yb-based intermediate-valence approximant crystals (ACs) with different degree of approximation to quasicrystal, Zn--Au--Yb 1/1 and 2/1 AC, and st…
Planar defect in approximant: the case of Cu-Al-Sc alloy
Tsutomu Ishimasa, Yeong-Gi So, Marek Mihalkovič
The {110} planar defect formed in the Cu-Al-Sc 1/1 approximant has been studied by means of electron microscopy and 6-dimensional analysis. As the displacement vector of the planar…
Icosahedral quasicrystal, 1/1 and 2/1 approximants in Zn-based ternary alloys containing Au and Yb/Tb
Tsutomu Ishimasa
In a narrow composition range centered at Zn74.5Au10.5Yb15.0, Tsai-type icosahedral quasicrystal is formed in alloys quenched from 880 C. This quasicrystal belongs to the primitive…
Interpretation of some Yb-based valence-fluctuating crystals as approximants to a dodecagonal quasicrystal
Tsutomu Ishimasa, Marek Mihalkovič, Kazuhiko Deguchi +2
The hexagonal ZrNiAl-type (space group: P-62m) and the tetragonal Mo2FeB2-type (space group: P4/mbm) structures, which are frequently formed in the same Yb-based alloys and exhibit…
Aging effects of dodecagonal quasicrystal formed in Mn-Cr-Ni-Si alloys
Kotoba Toyonaga, Tsutomu Ishimasa
The formation of Mn-Cr-Ni-Si dodecagonal quasicrystal has been studied at 600 and 700 C. The growth process of the quasicrystal from as-cast beta-Mn phase was explained by Johnson-…
Pressure-Driven Quantum Criticality and T/H Scaling in the Icosahedral Au-Al-Yb Approximant
Shuya Matsukawa, Kazuhiko Deguchi, Keiichiro Imura +2
We report on ac magnetic susceptibility measurements under pressure of the Au-Al-Yb alloy, a crystalline approximant to the icosahedral quasicrystal that shows unconventional quant…