M. Motokawa

Publication List Details

Period

1988 - 2008

Number

34

Co-Authors

Influence of sex hormone disturbances on the internal structure of the mandible in newborn mice (2006)

Fujita, T., Ohtani, J., Shigekawa, M., Kawata, T., Kaku, M., Kohno, S., ...

It has not yet been clarified how sex hormones affect craniofacial bone development immediately after birth. The purpose of this study was to examine the effects of sex hormone deficiency on...

Influence of sex hormone disturbances on the internal structure of the mandible in newborn mice (2006)

Fujita, T., Ohtani, J., Shigekawa, M., Kawata, T., Kaku, M., Kohno, S., ...

It has not yet been clarified how sex hormones affect craniofacial bone development immediately after birth. The purpose of this study was to examine the effects of sex hormone deficiency on...

The Competition between Staggered Field and Antiferromagnetic Interactions in Cugeo3:Fe (2004)

Demishev, S. V, Semeno, A. V., Pronin, A. A., Sluchanko, N. E., Samarin, N. A., Ohta, H., ...

The EPR spectra along different crystallographic axes for single crystals of CuGeO3 containing 1% of Fe impurity have been studied in the frequency range 60-360 GHz at temperatures 0.5-30 K. The...

Quantum Critiality and Collective Effects in Low Dimensional Magnet CuGeO3 Probed by High Frequency EPR (2004)

Demishev, S. V, Semeno, A. V., Pronin, A. A., Sluchanko, N. E., Samarin, N. A., Ohta, H., ...

For the CuGeO3 single crystals doped with 1% of Fe the quantum critical behavior in a wide temperature range 1-40 K is reported. The critical exponents for susceptibility along different...

Disorder driven quantum critical behavior in CuGeO3 doped with magnetic impurity (2004)

Demishev, S. V., Semeno, A. V., Sluchanko, N. E., Samarin, N. A., Pronin, A. A., Glushkov, V. V., ...

For the CuGeO3 doped with 1% of Fe the quantum critical behavior in a wide temperature range 1-40 K is reported. The critical exponents for susceptibility along different crystallographic axes are...

ESR study on the excited state energy spectrum of SrCu$_2$(BO$_3$)$_2$ -a central role of multiple-triplet bound states (2002)

Nojiri, H., Kageyama, H., Ueda, Y., Motokawa, M.

The excited state energy spectrum of a two-dimensional dimer system SrCu$_2$(BO$_3$)$_2$ has been investigated by high field ESR. Various types of multiple-triplet bound states-excited singlet,...

Fermi Surface Study of Quasi-Two-Dimensional Organic Conductors by Magnetooptical Measurements (2002)

Oshima, Y., Ohta, H., Koyama, K., Motokawa, M., Yamamoto, H. M., Kato, R., ...

Magnetooptical measurements of several quasi-two-dimensional (q2D) organic conductors, which have simple Fermi surface structure, have been performed by using a cavity perturbation technique. Despite...

Observation of High-Order Harmonic Resonances in Magnetooptical Measurements of (BEDT-TTF)2Br(DIA) (2002)

Oshima, Y., Ohta, H., Koyama, K., Motokawa, M., Yamamoto, H. M., Kato, R.

Magnetooptical measurements of a quasi-two-dimensional (q2D) organic conductor (BEDT-TTF)2Br(DIA) (DIA=diiodoacetylene) were performed using a cavity perturbation technique with a millimeter vector...

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl$_{3}$ (2000)

Maruyama, S., Tanaka, H., Narumi, Y., Kindo, K., Nojiri, H., Motokawa, M., ...

The static and dynamic magnetic properties of an $S=1/2$ stacked triangular antiferromagnet RbCuCl$_{3}$ with a helical spin structure due to lattice distortion were investigated by susceptibility,...

High frequency ESR investigation on dynamical charge disproportionation and spin gap excitation in NaV_2O_5 (2000)

Nojiri, H., Luther, S., Isobe, M., Ueda, Y., Motokawa, M.

A significant frequency dependence of the ESR line width is found in NaV_2O_5 between 34-100 K and the line width increases as the resonance frequency is increased from 95 GHz to 760 GHz. The...

ESR investigation on the Breather mode and the Spinon-Breather dynamical crossover in Cu Benzoate (1999)

Asano, T., Nojiri, H., Inagaki, Y., Boucher, J. P., Sakon, T., Ajiro, Y., ...

A new elementary-excitation, the so called "breather excitation", is observed directly by millimeter-submillimeter wave electron spin resonance (ESR) in the Heisenberg quantum spin-chain Cu benzoate,...

Magnetotransport properties of (Ga,Mn)As investigated at low temperature and high magnetic field (1999)

Omiya, T., Matsukura, F., Dietl, T., Ohno, Y., Sakon, T., Motokawa, M., ...

Magnetotransport properties of ferromagnetic semiconductor (Ga,Mn)As have been investigated. Measurements at low temperature (50 mK) and high magnetic field (

Submillimeter Wave ESR Study of Spin Gap Excitations in CuGeO3 (1999)

Nojiri, H., Ohta, H., Okubo, S., Fujita, O., Akimitsu, J., Motokawa, M.

Transitions between the ground singlet state to the excited triplet state has been observed in CuGeO3 by means of submillimeter wave electron spin resonance. The strong absorption intensity shows the...

Two ferromagnetic phases in La1-xSrxMnO3(x ~1/8) (1999)

Nojiri, H., Kaneko, K., Motokawa, M., Hirota, K., Takahashi, K., Endoh, Y.

It was discovered in La1-xSrxMnO3(x~1/8) that a field induced phase transition occurs from a ferromagnetic metal(FM) phase to a ferromagnetic insulator (FI) phase. The magnetization shows a sharp...

Direct observation of the multiple spin gap excitations in two-dimensional dimer system SrCu2(BO3)2 (1999)

Nojiri, H, Kageyama, H., Onizuka, Kenzo, Ueda, Y., Motokawa, M.

Various spin gap excitations have been observed in the two-dimensional dimer system SrCu_2(BO_3)_2 by means of submillimeter wave ESR. The zero-field energy gap of the lowest spin gap excitation...

Field Induced Transition from Metal to Insulator in the CMR Manganites (1998)

Endoh, Y., Nojiri, H., Kaneko, K., Hirota, K., Fukuda, T., Kimura, H., ...

The gigantic reduction of the electric resistivity under the applied magnetic field, CMR effect, is now widely accepted to appear in the vicinity of the insulator to metal transition of the...

FIR ABSORPTION SPECTRA OF LINEAR CHAIN ISING ANTIFERROMAGNET CsCoCl3 (1988)

Ohta, H., Fukuda, K., Kitamura, N., Motokawa, M.

The absorption spectra of CsCoCl3 are observed using FIR lasers (103.6 and 97.1 cm-1) and pulsed high magnetic field up to 17 T. Obtained g-values for H // c Vary from 4.2 to 4.8 depending on the...

MAGNETIC PHASE TRANSITION OF HELICAL CsCuCl3 IN HIGH MAGNETIC FIELD (1988)

Nojiri, H., Tokunaga, Y., Motokawa, M.

Magnetization measurements of CsCuCl3 is performed using pulsed high magnetic fields at various temperatures atures below TN. Magnetization shows a small jump at 12.5 T and saturation at 31 T at 1.1...

FIR ABSORPTION SPECTRA OF LINEAR CHAIN ISING ANTIFERROMAGNET CsCoCl3 (1988)

Ohta, H., Fukuda, K., Kitamura, N., Motokawa, M.

The absorption spectra of CsCoCl3 are observed using FIR lasers (103.6 and 97.1 cm-1) and pulsed high magnetic field up to 17 T. Obtained g-values for H // c Vary from 4.2 to 4.8 depending on the...

MAGNETIC PHASE TRANSITION OF HELICAL CsCuCl3 IN HIGH MAGNETIC FIELD (1988)

Nojiri, H., Tokunaga, Y., Motokawa, M.

Magnetization measurements of CsCuCl3 is performed using pulsed high magnetic fields at various temperatures atures below TN. Magnetization shows a small jump at 12.5 T and saturation at 31 T at 1.1...

FIR ABSORPTION SPECTRA OF LINEAR CHAIN ISING ANTIFERROMAGNET CsCoCl3 (1988)

Ohta, H., Fukuda, K., Kitamura, N., Motokawa, M.

The absorption spectra of CsCoCl3 are observed using FIR lasers (103.6 and 97.1 cm-1) and pulsed high magnetic field up to 17 T. Obtained g-values for H // c Vary from 4.2 to 4.8 depending on the...

MAGNETIC PHASE TRANSITION OF HELICAL CsCuCl3 IN HIGH MAGNETIC FIELD (1988)

Nojiri, H., Tokunaga, Y., Motokawa, M.

Magnetization measurements of CsCuCl3 is performed using pulsed high magnetic fields at various temperatures atures below TN. Magnetization shows a small jump at 12.5 T and saturation at 31 T at 1.1...