Kawasaki, S., Katayama, K., Sugawara, H., Kikuchi, D., Sato, H.
We report $^{123}$Sb nuclear quadrupole resonance (NQR) measurements of the filled skutterudite heavy-fermion superconductor PrOs$_4$Sb$_{12}$ under high pressure. The temperature dependence of NQR...
Anomalous Anisotropic Magnetoresistance in Heavy-Fermion PrFe4P12 (2008)
Sugawara, H., Kuramochi, E., Namiki, T., Matsuda, T. D., Aoki, Y., Sato, H.
We have investigated the anisotropy of the magnetoresistance in the Pr-based HF compound PrFe4P12. The large anisotropy of effective mass and its strong field dependence have been confirmed by...
Gap opening with ordering in PrFe4P12 studied by local tunneling spectroscopy (2008)
Suderow, H., Behnia, K., Guillamon, I., Crespo, V., Vieira, S., Kikuchi, D., ...
We present measurements of the local tunneling density of states in the low temperature ordered state of PrFe4P12. The temperature dependencies of the Fermi level density of states and of the...
Naito, T, Sugawara, H, Inabe, T
By maintaining α-Ag(DM)2 (DM = C10H8N4) around room temperature (RT) (
Naito, T, Sugawara, H, Inabe, T
By maintaining α-Ag(DM)2 (DM = C10H8N4) around room temperature (RT) (
Shu, Lei, MacLaughlin, D. E., Aoki, Y., Tunashima, Y., Yonezawa, Y., Sanada, S., ...
Zero- and longitudinal-field muon spin relaxation (MuSR) experiments have been carried out in the alloy series Pr(Os1-xRux)4Sb12 and Pr1-yLayOs4Sb12 to elucidate the anomalous dynamic muon spin...
Braithwaite, D., Lapertot, G., Bordet, P., Sugawara, H., ...
A thorough characterization of many samples of the filled skutterudite compound PrOs4Sb12 is provided. We find that the double superconducting transition in the specific heat Tc1~1.89K and Tc2~1.72K...
On the Symmetry of Low-Field Ordered Phase of PrFe4P12 : 31P NMR (2007)
Kikuchi, J., Takigawa, M., Sugawara, H., Sato, H.
We have performed 31P nuclear magnetic resonance (NMR) experiments on the filled skutterudite compound PrFe4P12 to investigate the exotic ordered phase at low temperatures and low magnetic fields....
Photochemical Transformation of Molecular Crystals into Devices (2007)
Naito, T., Sugawara, H., Inabe, T., Miyamoto, T., Niimi, H., Asakura, K.
Photochemical Transformation of Molecular Crystals into Devices (2007)
Naito, T., Sugawara, H., Inabe, T., Miyamoto, T., Niimi, H., Asakura, K.
Muon spin relaxation and hyperfine-enhanced 141Pr nuclear spin dynamics (2007)
Shu, L, MacLaughlin, DE, Aoki, Y, Tunashima, Y, Yonezawa, Y, Sanada, S, ...
Low-lying optical phonon modes in the filled skutterudite CeRu4Sb12 (2006)
Lee, C. H., Hase, I., Sugawara, H., Yoshizawa, H., Sato, H.
The phonon dynamics of filled skutterudite CeRu4Sb12 have been studied at room temperature by inelastic neutron scattering. Optical phonons associated with a large vibration of Ce atoms are observed...
Yogi, M., Nagai, T., Imamura, Y., Mukuda, H., Kitaoka, Y., Kikuchi, D., ...
We report on Sb nuclear-quadrupole-resonance (NQR) study in filled-skutterudite compounds (Pr_1-xLa_x)Os_4Sb_12. The Sb-NQR spectra have split into two sets, arising from different Sb_12 cages...
Rotundu, C. R., Tsujii, H., Kumar, P., Andraka, B., Sugawara, H., Aoki, Y., ...
Measurements of the upper critical field $H_{c2}$ near $T_c$ of Pr$_{1- x}$La$_{x}$Os$_{4}$Sb$_{12}$ were performed by specific heat. A positive curvature in $H_{c2}$ versus $T$ was observed in...
Universal scaling in the dynamical conductivity of heavy fermion Ce and Yb compounds (2006)
Okamura, H., Watanabe, T., Matsunami, M., Nishihara, T., Tsujii, N., Ebihara, T., ...
Dynamical conductivity spectra s(w) have been measured for a diverse range of heavy-fermion (HF) Ce and Yb compounds. A characteristic excitation peak has been observed in the mid-infrared region of...
Naito, T., Sugawara, H., Inabe, T., Kitajima, Y., Miyamoto, T., Niimi, H., ...
Thermal analysis of Ag(DM)2, where DM = 2,5-dimethyl-N,N’- dicyanoquinonediimine, clarified that the salt had an insulating amorphous phase ( ≥ 155°C). Characterization of this and related solid...
Naito, T., Sugawara, H., Inabe, T., Kitajima, Y., Miyamoto, T., Niimi, H., ...
Thermal analysis of Ag(DM)2, where DM = 2,5-dimethyl-N,N'- dicyanoquinonediimine, clarified that the salt had an insulating amorphous phase ( ≥ 155°C). Characterization of this and related solid...
Matsunami, M., Horiba, K., Taguchi, M., Yamamoto, K., Chainani, A., Takata, Y., ...
Semiconducting skutterudite CeFe$_4$P$_{12}$ is investigated by synchrotron x-ray photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). Ce 3$d$ core-level PES and 3$d-4f$ XAS, in...
Drastic change in transport of entropy with quadrupolar ordering in PrFe$_{4}$P$_{12}$ (2005)
Pourret, A., Behnia, K., Kikuchi, D., Aoki, Y., Sugawara, H., Sato, H.
The antiferroquadrupolar ordering of PrFe$_{4}$P$_{12}$ is explored by probing thermal and thermoelectric transport. The lattice thermal conductivity drastically increases with the ordering, as a...
Nakai, Y., Ishida, K., Kikuchi, D., Sugawara, H., Sato, H.
We have performed $^{139}$La,$^{31}$P-NMR studies on a filled skutterudite superconductor LaFe$_{4}$P$_{12}$ with a critical temperature $T_c=4.1$ K. In the normal state, the presence of...
Transport properties of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$ (2005)
Sugawara, H., Kobayashi, M., Osaki, S., Saha, S. R., Namiki, T., Aoki, Y., ...
We have measured the electrical resistivity, thermoelectric power, Hall coefficient, and magnetoresistance (MR) on single crystals of PrOs$_{4}$Sb$_{12}$, LaOs$_{4}$Sb$_{12}$ and NdOs$_{4}$Sb$_{12}$....
Saha, S. R., Sugawara, H., Aoki, Y., Sato, H., Inada, Y., Shishido, H., ...
We report the de Haas-van Alphen (dHvA) effect and magnetoresistance in the filled-skutterudite superconductor LaRu4P12, which is a reference material of PrRu4P12 that exhibits a metal-insulator...
Kobayashi, M., Sato, H., Sugawara, H., Fujiwara, H., Aoki, Y.
We have investigated the electrical resistivity of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$ in the mixed state. We found unusual double minima in the flux-flow resistivity as a function...
Kuwahara, K., Iwasa, K., Kohgi, M., Kaneko, K., Metoki, N., Raymond, S., ...
We report inelastic neutron scattering experiments performed to investigate the low energy magnetic excitations on single crystals of the heavy-fermion superconductor PrOs$_{4}$Sb$_{12}$. The...
Multiple superconducting phases in heavy fermion superconductors (2005)
Matsuda,Y., Izawa,K., Watanabe,T., Kasahara,Y., Nakajima,Y., Sakakibara,T., ...
Multiple superconducting phases in heavy fermion superconductors (2005)
Matsuda, Y., Izawa, K., Watanabe, T., Kasahara, Y., Nakajima, Y., Sakakibara, T., ...
Sugawara, H., Osaki, S., Kobayashi, M., Namiki, T., Saha, S. R., Aoki, Y., ...
We have measured both magnetoresistance and Hall effect in CeOs$_4$Sb$_{12}$ to clarify the large resistivity state ascribed to the Kondo insulating one and the origin of the phase transition near...
Evolution of superconducting order in Pr(Os$_{1-x}$Ru$_{x}$)$_{4}$Sb$_{12}$ (2004)
Chia, Elbert E. M., Salamon, M. B., Vandervelde, D., Kikuchi, D., Sugawara, H., Sato, H.
We report measurements of the magnetic penetration depth $\lambda$ in single crystals of Pr(Os$_{1-x}$Ru$_{x}$)$_{4}$Sb$_{12}$ down to 0.1 K. Both $\lambda$ and superfluid density $\rho_{s}$ exhibit...
Izawa,K., Nakajima,Y., Goryo,J., Matsuda,Y., Osaki,S., Sugawara,H., ...
Izawa,K., Nakajima,Y., Goryo,J., Matsuda,Y., Osaki,S., Sugawara,H., ...
Superconducting phase diagram of the filled skuterrudite PrOs4Sb12 (2004)
Braithwaite, D., Flouquet, J., Seyfarth, G., Brison, J.P., Lhotel, E., ...
We present new measurements of the specific heat of the heavy fermion superconductor PrOs4Sb12, on a sample which exhibits two sharp distinct anomalies at Tc1= 1.89K and Tc2= 1.72K. They are used to...
Superconducting phase diagram of the filled skuterrudite PrOs4Sb12 (2004)
Braithwaite, D., Flouquet, J., Seyfarth, G., Brison, J.P., Lhotel, E., ...
We present new measurements of the specific heat of the heavy fermion superconductor PrOs4Sb12, on a sample which exhibits two sharp distinct anomalies at Tc1= 1.89K and Tc2= 1.72K. They are used to...
Superconducting phase diagram of the filled skuterrudite PrOs4Sb12 (2004)
Braithwaite, D., Flouquet, J., Seyfarth, G., Brison, J.P., Lhotel, E., ...
We present new measurements of the specific heat of the heavy fermion superconductor PrOs4Sb12, on a sample which exhibits two sharp distinct anomalies at Tc1= 1.89K and Tc2= 1.72K. They are used to...
Superconducting phase diagram of the filled skuterrudite PrOs4Sb12 (2004)
Braithwaite, D., Flouquet, J., Seyfarth, G., Brison, J.P., Lhotel, E., ...
We present new measurements of the specific heat of the heavy fermion superconductor PrOs4Sb12, on a sample which exhibits two sharp distinct anomalies at Tc1= 1.89K and Tc2= 1.72K. They are used to...
Superconducting phase diagram of the filled skuterrudite PrOs4Sb12 (2004)
Braithwaite, D., Flouquet, J., Seyfarth, G., Brison, J. P., Lhotel, E., ...
We present new measurements of the specific heat of the heavy fermion superconductor PrOs4Sb12, on a sample which exhibits two sharp distinct anomalies at Tc1= 1.89K and Tc2= 1.72K. They are used to...
Chia, Elbert E. M., Salamon, M. B., Sugawara, H., Sato, H.
We report measurements of the magnetic penetration depth $\lambda$ in single crystals of PrRu$_{4}$Sb$_{12}$ down to 0.1 K. Both $\lambda$ and superfluid density $\rho_{s}$ exhibit an exponential...
Probing the superconducting gap symmetry of PrOs$_{4}$Sb$_{12}$: A penetration depth study (2003)
Chia, Elbert E. M., Salamon, M. B., Sugawara, H., Sato, H.
We report measurements of the magnetic penetration depth $\lambda$ in single crystals of PrOs$_{4}$Sb$_{12}$ down to $\sim$0.1 K using a tunnel-diode based, self-inductive technique at 21 MHz, with...
Aoki, Y., Tsuchiya, A., Kanayama, T., Saha, S. R., Sugawara, H., Sato, H., ...
We report on muon spin relaxation measurements of the 4f^2-based heavy-fermion superconductor filled-skutterudite PrOs4Sb12. The results reveal the spontaneous appearance of static internal magnetic...
High magnetic field phase diagram of PrOs4Sb12 (2003)
Rotundu, C. R., Tsujii, H., Takano, Y., Andraka, B., Sugawara, H., Aoki, Y., ...
The magnetic phase diagram of PrOs$_4$Sb$_{12}$ has been investigated by specific heat measurements between 8 and 32 T. A new Schottky anomaly due to excitations between two lowest...
Magnetic Phase Diagram of the Heavy-Fermion Superconductor PrOs4Sb12 (2003)
Tayama, T., Sakakibara, T., Sugawara, H., Aoki, Y., Sato, H.
We investigated the magnetic phase diagram of the first Pr-based heavy fermion superconductor PrOs4Sb12 by means of high-resolution dc magnetization measurements in low temperatures down to 0.06K....
Yogi, M., Kotegawa, H., Imamura, Y., Kitaoka, Y., Sugawara, H., ...
We report the electronic and superconducting properties in the Pr-based filled-skutterudite superconductor PrRu$_4$Sb$_{12}$ with $T_c = 1.3$ K via the measurements of nuclear-quadrupole-resonance...
Multiple superconducting phases in new heavy fermion superconductor PrOs4Sb12 (2003)
Izawa,K., Nakajima,Y., Goryo,J., Matsuda,Y., Osaki,S., Sugawara,H., ...
Multiple superconducting phases in new heavy fermion superconductor PrOs4Sb12 (2003)
Izawa, K., Nakajima, Y., Goryo, J., Matsuda, Y., Osaki, S., Sugawara, H., ...
Specific Heat Study on Heavy-Fermion Pr compounds with filled skutterudite structure (2002)
Aoki, Y., Namiki, T., Kanayama, T., Ohsaki, S., Saha, S. R., Sugawara, H., ...
Rare 4f^2-based heavy-fermion behaviors have been revealed recently in Pr-based filled skutterudites PrFe4P12 and PrOs4Sb12. Recent studies on the thermal properties on both compounds are reported,...
Fermi surface of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$ (2002)
Sugawara, H., Osaki, S., Saha, S. R., Aoki, Y., Sato, H., Inada, Y., ...
We have investigated the de Haas-van Alphen effect in the Pr-based heavy fermion superconductor PrOs$_4$Sb$_{12}$.The topology of Fermi surface is close to the reference compound LaOs$_4$Sb$_{12}$...
Multiple Superconducting Phases in New Heavy Fermion Superconductor PrOs4Sb12 (2002)
Izawa, K., Nakajima, Y., Goryo, J., Matsuda, Y., Osaki, S., Sugawara, H., ...
The superconducting gap structure of recently discovered heavy fermion superconductor PrOs4Sb12 was investigated by using thermal transport measurements in magnetic field rotated relative to the...
Kotegawa, H., Yogi, M., Imamura, Y., Kawasaki, Y., Kitaoka, Y., ...
We report Sb-NQR results which evidence a heavy-fermion (HF) behavior and an unconventional superconducting (SC) property in the filled-skutterudite compound PrOs_4Sb_12 revealing a SC transition...
Possible Kondo resonance in PrFe4P12 studied by bulk-sensitive photoemission (2002)
Yamasaki, A., Imada, S., Nanba, T., Sekiyama, A., Sugawara, H., Sato, H., ...
Pr 4f electronic states in Pr-based filled skutterudites PrT4X12(T=Fe and Ru; X=P and Sb) have been studied by high-resolution bulk-sensitive Pr 3d-4f resonance photoemission. A very strong spectral...
Saha, S. R., Sugawara, H., Namiki, T., Aoki, Y., Sato, H.
The effect of uniaxial pressure (P_u) on the magnetic susceptibility (X), magnetization (M), and magnetoresistance (MR) of the heavy-fermion metamagnet CeRu2Si2 has been investigated. For the...
Aoki, Y., Namiki, T., Ohsaki, S., Saha, S. R., Sugawara, H., Sato, H.
We report measurements of low-temperature specific heat on the 4f^2-based heavy-fermion superconductor PrOs4Sb12. In magnetic fields above 4.5 T in the normal state, distinct anomalies are found...
Magnetic fluctuations and superconductivity in YbPd$_2$Sn (2002)
Amato, A., Roessli, B., Fischer, P., Bernhoeft, N., Stunault, A., Baines, C., ...
We report muon spin relaxation and inelastic neutron measurements on the Heusler system YbPd$_2$Sn. Localised anisotropic and quasi-elastic Yb magnetic fluctuations are observed below $T = 150$K....
Anomalous heavy-fermion and ordered states in the filled skutterudite PrFe4P12 (2002)
Aoki, Y., Namiki, T., Matsuda, T. D., Abe, K., Sugawara, H., Sato, H.
Specific heat and magnetization measurements have been performed on high-quality single crystals of filled-skutterudite PrFe_4P_{12} in order to study the high-field heavy-fermion state (HFS) and...
Unusual behaviors in the transport properties of REFe$_{4}$P$_{12}$ (RE: La, Ce, Pr, and Nd) (2000)
Sato, H., Abe, Y., Okada, H., Matsuda, T. D., Abe, K., Sugawara, H., ...
We have investigated the resistivity ($\rho$), thermoelectric power (TEP) and Hall coefficient ($R_{H}$) on high quality single crystals of REFe$_{4}$P$_{12}$. TEP in CeFe$_{4}$P$_{12}$ is extremely...
Sugawara, H., Matsuda, T. D., Abe, K., Aoki, Y., Sato, H., Nojiri, S., ...
We report the de Haas-van Alphen (dHvA) experiment on the filled skutterudite PrFe$_4$P$_{12}$ exhibiting apparent Kondo-like behaviors in the transport and thermal properties. We have found...
Saha, S. R., Sugawara, H., Matsuda, T. D., Aoki, Y., Sato, H., Sampathkumaran, E. V.
Magnetization, heat capacity, electrical resistivity, thermoelectric power, and Hall effect have been investigated on single-crystalline Ce_2PdSi_3. This compound is shown to order...
Saha, S. R., Sugawara, H., Matsuda, T. D., Sato, H., Mallik, R., Sampathkumaran, E. V.
Electrical resistivity ($\rho$), magnetoresistance (MR), magnetization, thermopower and Hall effect measurements on the single crystal Gd$_{2}$PdSi$_3$, crystallizing in an AlB$_2$-derived hexagonal...
Novel Elastic Anomalies in Zr-N Films. (1998)
Yoshizawa, M., Sugawara, H., Nakamura, Y., Oki, N.
Elastic anomalies have been observed as a function of temperature in Zr-N sputtered films. Both metallic and insulating samples show a broad minimum at high-temperature. A remarkable elastic...
CD Antigens 1996: announcement (1997)
Kishimoto, T., Goyert, S., Kikutani, H., Mason, D., Miyasaka, M., Moretta, L., ...