Determination of Boundary Scattering, Intermagnon Scattering, and the Haldane Gap in Heisenberg Chains

Low-lying magnon dispersion in a S=1 Heisenberg antiferromagnetic (AF) chain is analyzed using the non-Abelian DMRG method. The scattering length $a_{\rm b}$ of the boundary coupling and the inter-magnon scattering length $a$ are determined. The scattering length $a_{\rm b}$ is found to exhibit a characteristic diverging behavior at the crossover point. In contrast, the Haldane gap $\Delta$, the magnon velocity $v$, and $a$ remain constant at the crossover. Our method allowed estimation of the gap of the S=2 AF chain to be $\Delta = 0.0891623(9)$ using a chain length longer than the correlation length $\xi$.Comment: 6 pages, 3 figures, 1 table, accepted in Phys. Rev.

Spin injection and magnetoresistance in ferromagnet/superconductor/ferromagnet tunnel junctions

We theoretically study the spin-dependent transport in a ferromagnet/superconductor/ferro-magnet double barrier tunnel junction. The spin-polarized tunneling currents give rise to spin imbalance in the superconductor. The resulting nonequilibrium spin density suppresses the superconductivity with increase of the tunneling currents. We focus on the effect of asymmetry in the double tunnel junction, where the barrier height of the tunnel junction and the spin-polarization of the ferromagnets are different, on spin injection, and discuss how the superconductivity is suppressed in the asymmetric junction. Our results explain recent experimental results on the critical current suppression in high-$T_c$ SCs by spin injection.Comment: 3 pages, 2 figures, proceeding of MMM'9

Retinal adaptation of Japanese common squid (Todarodes pacificus Steenstrup) to light changes

The response of retinae of the Japanese common squid (Todarodes pacificus Steenstrup) was recorded in relation to various light intensities. In the light-adapted eye of common squid, the black pigment ascends to the external limiting membrance of the retina. Conversely, in the dark-adapted eye the black pigment descends toward the center of the black pigment layer. To express the degree of adaptation, the authors give the ratio of the height (thickness) of the black pigment to the total height (thickness) of the retina as a percentage (%)

FAULKNER ITEMS IN THE OXFORD EAGLE (Part4)

Article信州大学教養部紀要. 第一部, 人文科学. 第二部, 自然科学 19: 91-178(1985)departmental bulletin pape

TWO DEMISES IN THE LEATHERSTOCKING TALES : CHINGACHGOOK'S AND NATHANIEL BUMPPO'S

Article信州大学教養部紀要. 24: 43-51(1990)departmental bulletin pape

THEATRICAL EFFECTS RECONSIDERED IN HEMINGWAY'S "CAT IN THE RAIN"

Article信州大学教養部紀要. 27: 99-104(1993)departmental bulletin pape