Aoyama Gakuin University

About: Aoyama Gakuin University is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Superconductivity & Thin film. The organization has 3494 authors who have published 6419 publications receiving 115648 citations. The organization is also known as: Aoyama gakuin daigaku.

Magnons and phonons in Nd2CuO4

Abstract: Antiferromagnetic magnons Nd/sub 2/CuO/sub 4/, which is the mother material of the electron superconductor (Nd/sub 1/minus//ital x//Ce/sub /ital x//)/sub 2/CuO/sub 4/minus//ital y//, are observed by Raman scattering. The effective exchange integral estimated from the two-magnon peak energy is 1070 cm/sup /minus/1/, which is unexpectedly large in spite of the large Cu-Cu atomic distance compared with those in other superconducting oxides. Lattice vibrations are also investigated. A large two-phonon peak due to the intralayer breathing mode is observed at 1178 cm/sup /minus/1/.

Representation of economic preferences in the structure and function of the amygdala and prefrontal cortex

Abstract: Representation of economic preferences in the structure and function of the amygdala and prefrontal cortex

Dynamic photometric imaging polarizer-sample-analyzer polarimeter: instrument for mapping birefringence and optical rotation

Abstract: An imaging dynamic photopolarimeter in an optical configuration P(α)SA(n) (polarizer-sample-analyzer) having harmonically rotating polarizer (P) and analyzer (A), is presented for studies of inhomogeneous birefringent media. The method is capable of simple and precise measuring of birefringence and optical rotation across a two-dimensional field. Although the basic principle upon which the method operates has been proposed earlier, the focus here is on its extension, applicable to a whole field, and immediate measurement of three optical parameters, which have direct physical meaning. Earlier versions of the instrument either operate with a single beam or measure components of Jones or Mueller matrices. The operation of the given method is consistent with a general idea of dynamic photopolarimetry by discrete Fourier analysis and entails digital procession of intensity images, obtained at nine equispaced positions of the polarizer and the analyzer during synchronous rotation of them. A technique of data acquisition is described, and a detailed error analysis is provided. Theoretical considerations are supplemented with testing measurements of a quartz phase plate.

Field and temperature dependence of NMR relaxation rate in the magnetic quadrupolar liquid phase of spin- 1 2 frustrated ferromagnetic chains

Abstract: It is generally difficult experimentally to distinguish magnetic multipolar orders in spin systems. Recently, it was proposed that the temperature dependence of the nuclear magnetic resonance relaxation rate $1/{T}_{1}$ can involve an indirect but clear signature of the field-induced spin nematic or multipolar Tomonaga-Luttinger (TL) liquid phase [M. Sato, T. Momoi, and A. Furusaki, Phys. Rev. B 79, 060406(R) (2009)]. In this paper, we evaluate accurately the field and temperature dependence of $1/{T}_{1}$ in spin-$\frac{1}{2}$ frustrated ${J}_{1}$-${J}_{2}$ chains combining field-theoretical techniques with numerical data. Our results demonstrate that isotherms of $1/{T}_{1}$ as a function of magnetic field also exhibit distinctive nonmonotonic behavior in spin nematic TL liquid, in contrast with the standard TL liquid in the spin-$\frac{1}{2}$ Heisenberg chain. The relevance of our results to quasi-one-dimensional edge-sharing cuprate magnets, such as ${\mathrm{LiCuVO}}_{4}$, is discussed.