A5016895953- Advanced Condensed Matter Physics
- Zeolite Catalysis and Synthesis
- Advanced NMR Techniques and Applications
- Physics of Superconductivity and Magnetism
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Crystal Structures and Properties
- Chalcogenide Semiconductor Thin Films
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Perovskite Materials and Applications
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Semiconductor Quantum Structures and Devices
- Molecular Junctions and Nanostructures
- Chemical Synthesis and Characterization
- Strong Light-Matter Interactions
- High-pressure geophysics and materials
- Inorganic Chemistry and Materials
- Advanced Physical and Chemical Molecular Interactions
- Organic and Molecular Conductors Research
- Glass properties and applications
- Magnetism in coordination complexes
- Chemical and Physical Properties of Materials
- Theoretical and Computational Physics
Osaka University
2012-2021
Tohoku University
1992-2001
Jilin University
1999
University of Manchester
1998
Sendai University
1991
Changchun Institute of Technology
1989
Potassium clusters are incorporated into supercages of zeolite LTA crystals, with the arrayed in a simple cubic structure at number density 5.3\ifmmode\times\else\texttimes\fi{}${10}^{20}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$. About four 4s electrons K atoms included each cluster. The ac magnetic susceptibility increases dramatically decreases temperature below 8 K, and shows ferromagnetism about 4 K. effective moment per supercage is estimated to be...
An array of analytical techniques comprising powder X-ray diffraction, solid-state NMR spectroscopy, high-resolution transmission electron microscopy, nitrogen adsorption, and UV/vis diffuse reflectance spectroscopy has been applied to study the incorporation indium phosphide semiconductor inside MCM-41 materials by metal organic chemical vapor deposition. Line broadening in diffraction patterns suggests existence both large surface deposited particles nanosized within pores. High-resolution...
Ferromagnetic properties are reported for K clusters incorporated into the \ensuremath{\alpha} cage (supercage) of zeolite LTA. In LTA, cages arrayed in a simple cubic structure with lattice constant 12.3 \AA{}. The average 4s-electron number per cluster, n, is systematically changed from 0.8 to 7.3 by controlling loading density. Ferromagnetism observed 2--3n6--7. magnetization shows peak at n\ensuremath{\sim}5, and magnetic moment amounts 0.24${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$...
The absorption spectra are reported for HgI 2 , PbI and BiI 3 clusters molecules incorporated into supercages of zeolite LTA at various loading densities. exhibit bands originating from a molecule to five molecular monomer dimer . excitation energies largely shifted the higher energy side compared with respective bulk exciton energies, shift decreasing number molecules, indicating quantum size effect on energy. blue decreases in order can be interpreted qualitatively terms effective mass...
Optical properties are reported for cationic K clusters incorporated into the \ensuremath{\alpha} cage of K-form LTA. The has an inside diameter \ensuremath{\sim}11 \AA{} and is arrayed in a simple cubic structure. loading density potassium systematically changed from dilute to saturated conditions. average number guest atoms 7.3 per at saturation density. Three groups absorption and/or reflection bands appear depending on A band \ensuremath{\sim}2 eV increases becomes strongest with...
Magnetoelectric (ME) properties were investigated for an $XY$-like spin glass (SG) system, ${\mathrm{Ni}}_{x}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{TiO}}_{3}$ with ilmenite structure. The ME effect is usually observed in systems peculiar couplings between a crystal lattice and magnetic order. Nonetheless, we found antisymmetric nonzero tensor elements below ${T}_{\mathrm{ME}}=8--10\text{ }\text{ }\mathrm{K}$ samples showing SG transitions. At ${T}_{\mathrm{ME}}$, no specific heat anomaly...
Abstract In vortex-like spin arrangements, multiple spins can combine into emergent multipole moments. Such moments have broken space-inversion and time-reversal symmetries, therefore exhibit linear magnetoelectric (ME) activity. Three types of such are known: toroidal; monopole; quadrupole So far, however, the ME activity these has only been established experimentally for toroidal moment. Here we propose a magnetic square cupola cluster, in which four corner-sharing square-coordinated...
A series of ternary compounds RRhIn 5 (R: rare earth) has been grown in the single crystalline form by means flux method. The magnetic properties these were investigated measuring lattice parameter, electrical resistivity, specific heat, susceptibility and magnetization. All crystallize tetragonal HoCoGa -type structure. Most order antiferromagnetically at low temperatures, except when R=Y, La, Pr, Yb. observed temperature dependence heat anisotropic features magnetization have analyzed on...
As an experimental approach to clarify the correlation between doped impurity and native defects, copper was deped at a low temperature high-purity ZnSe crystals with controlled deviation from stoichiometry by previous heat treatment under molten Zn or saturation pressure of Se. Photoluminescence measured examined as function stoichiometry. The site selection doping Cu achieved controlling defect concentrations. I 1 deep lines are known arise acceptors two different origins, V .
The excitonic polariton dispersion for \(\bm{k}//[111]\) is determined by the two-photon-resonant Raman scattering via intermediate molecule state. Existences of k -linear effect and heavy light masses are clarified. Several levels molecules found.
Significance The quantum spin liquid state has been intensively pursued since Anderson proposed the resonating valence bond model. On other hand, liquids based on another electronic degree of freedom, orbital, believed unrealistic, because energy scale orbital correlation is normally one order magnitude higher than exchange coupling, resulting in an ordering at a signicantly high temperature accompanied by cooperative Jahn−Teller (JT) distortion. In this paper, we present striking complete...
Colour patterns of animals' bodies are usually produced by the spatial distribution pigments with different colours. However, some animals use variation colour-producing microstructures. We have studied one distinctive example such structurally colour patterns, wing Madagascan sunset moth, to clarify physical rules that underlie variation. It is known iridescent scale moth has alternate air–cuticle multilayer structure causes optical interference. The microscopic and investigations various...
Two-photon-resonant Raman scattering under the giant two-photon excitation of excitonic molecule has been observed from various directions, and two types scattering, M T are found. The transverse mixed modes \(A(\varGamma_{5})\) exciton state left behind in processes, respectively. These scatterings reflect characteristic dispersions their respective states, conform to geometrical selection rules derived on assumption that \(\varGamma_{1}\)-symmetry. A non-linear absorption peak due is found...
Absorption spectra are reported for Se adsorbed in faujasite (X or Y) as a function of x, where x is the Al-to-(Al+Si) ratio. The amount increases with increasing small and saturated x>or approximately=0.1. results interpreted using model which finite number atoms physically by each permanent dipole consists (AlO4)- zeolite framework cation. energy lower absorption edge changes spectral shapes classified into three types. Spectral differences also observed incorporated Linde type A L...
Magnetic-ordered states of the pyrochlore iridates Nd2Ir2O7 (Nd227) and Sm2Ir2O7 (Sm227), showing metal–insulator transitions at 33 117 K, respectively, were studied by both muon-spin-relaxation (μSR) method density functional theory (DFT) calculations. A long-range magnetic ordering Ir moments appeared in conjunction with metal insulator transition, additional long-range-ordered Nd/Sm confirmed temperatures below about 10 K. We found that all-in all-out spin structure most convincingly...
The electronic states of potassium- (K-) intercalated zigzag-type polycyclic aromatic (PLA) hydrocarbon [polyacene PLAs] ${\mathrm{K}}_{x}(\mathrm{PLAs})$ are studied for a series the four smallest molecules: naphthalene (NN), anthracene (AN), tetracene (TN), and pentacene (PN), focusing on their 1:1 stoichiometric phases. Clear experimental differences identified between first group [${\mathrm{K}}_{1}(\mathrm{NN})$ ${\mathrm{K}}_{1}(\mathrm{AN})$] second [${\mathrm{K}}_{1}(\mathrm{TN})$...
Giant two-photon absorption for the direct generation of excitonic molecule is found at 2.5507 eV in CdS. Two-photon resonance Raman scattering which has an and a transverse exciton as intermediate final states, respectively.
Na 4 3+ and K clusters arrayed in aluminosilicate sodalite are known to show antiferromagnetism below respective Néel temperatures T N =48 ≃70 K. We newly prepared K–Rb alloy (K 3 Rb) addition ones, performed muon-spin relaxation (µSR) measurements. find a large amplitude of precession signal zero-field µSR spectra, indicating that takes place the major volume samples. The is estimated from temperature dependence be ≃80 for . internal field at muon stopping site frequency ≃92, ≃142, ≃155 Oe...