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17 papers · 1 filter
Quasiparticle Excitations outside the Vortex Cores in MgB Probed by Muon Spin Rotation
Kazuki Ohishi, Takahiro Muranaka, Jun Akimitsu +3
The magnetic penetration depth in the mixed state of MgB has been determined microscopically from the field distribution around magnetic vortices probed by muon spin rotati…
Variable-range hopping conductivity in the copper-oxygen chains of La_3Sr_3Ca_8Cu_24O_41
T. Vuletic, B. Korin-Hamzic, S. Tomic +6
We show that the spin chain/ladder compound La_3Sr_3Ca_8Cu_24O_41 is an insulator with hopping transport along the chains. In the temperature range 35 - 280 K, DC conductivity sigm…
Spectral Function Analysis on Spin Dynamics in Double-Exchange Systems with Randomness
Yukitoshi Motome, Nobuo Furukawa
Spin excitation spectrum is studied in the double-exchange model with randomness. Applying the spin wave approximation and the spectral function analysis, we examine excitation ene…
Spin-wave Hamiltonian in double-exchange systems
Nobuo Furukawa, Yukitoshi Motome
A simple derivation of the effective spin-wave Hamiltonian for a double-exchange system with infinitely large Hund's-rule coupling is demonstrated. The formalism can be applied to…
Hybridization-induced superconductivity from the electron repulsion on a tetramer lattice having a disconnected Fermi surface
Takashi Kimura, Yuji Zenitani, Kazuhiko Kuroki +2
Plaquette lattices with each unit cell containing multiple atoms are good candidates for disconnected Fermi surfaces, which are shown by Kuroki and Arita to be favorable for spin-f…
Atmospheric gamma-ray observation with the BETS detectorfor calibrating atmospheric neutrino flux calculations
K. Kasahara, E. Mochizuki, S. Torii +13
We observed atmospheric gamma-rays around 10 GeV at balloon altitudes (15~25 km) and at a mountain (2770 m a.s.l). The observed results were compared with Monte Carlo calculations…