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9 papers · 1 filter
Electrical Resistivity and Thermal Expansion Measurements of URu2Si2 under Pressure
Gaku Motoyama, Nobuyuki Yokoyama, Akihiko Sumiyama +1
We carried out simultaneous measurements of electrical resistivity and thermal expansion of the heavy-fermion compound URu2Si2 under pressure using a single crystal. We observed a…
Generalized eigenfunctions of relativistic Schroedinger operators in two dimensions
Tomio Umeda, Dabi Wei
Generalized eigenfunctions of the two-dimensional relativistic Schrödinger operator with , , are considered. We compute the integra…
Theoretical calculations for solid oxygen under high pressure
Kazuki Nozawa, Nobuyuki Shima, Kenji Makoshi
The crystal structure of solid oxygen at low temperatures and at pressures up to 7 GPa is studied by theoretical calculations. In the calculations, the adiabatic potential of the c…
Quantum phase transitions of the asymmetric three-leg spin tube
Tôru Sakai, Masahiro Sato, Kouichi Okunishi +3
We investigate quantum phase transitions of the S=1/2 three-leg antiferromagnetic spin tube with asymmetric inter-chain (rung) exchange interactions. On the basis of the electron t…
First-principles studies for structural transitions in ordered phase of cubic approximant Cd6Ca
Kazuki Nozawa, Yasushi Ishii
Recently low-temperature structural transition has been reported for complex cubic compounds Cd6M (M=Ca, Yb, Y, rare earth) and it is believed that the transition is due to orienta…
Eigenfunctions of Dirac operators at the threshold energies
Tomio Umeda
We show that the eigenspaces of the Dirac operator at the threshold energies are coincide with the direct sum of the zero space and the kernel o…