Kasahara, S., Shibauchi, T., Hashimoto, K., Ikada, K., Tonegawa, S., Okazaki, R., ...
The normal-state charge transport is studied systematically in high-quality single crystals of BaFe$_2$(As$_{1-x}$P$_x$)$_2$ ($0 \leq x \leq 0.71$). By substituting isovalent P for As, the...
Das, Pradip, Tomy, C. V., Takeya, H., Ramakrishnan, S., Grover, A. K.
We present magnetic field dependence of the critical current density from dc-magnetization measurements concerning the anisotropic behavior of flux line lattice (FLL) in a single crystal of...
Thermo-magnetic history effects in the vortex state of YNi_2B_2C superconductor (2008)
Das, Pradip, Tomy, C. V., Takeya, H., Ramakrishnan, S., Grover, A. K.
The nature of five-quadrant magnetic isotherms for is different from that for in a single crystal of YNi2B2C, pointing towards an anisotropic behaviour of the flux line lattice (FLL). For, a well...
Das, Pradip, Tomy, C. V., Takeya, H., Ramakrishnan, S., Grover, A. K.
We have explored the vortex phase diagram in a spherical single crystal of niobium (T ~ 9.3 K) via isothermal and temperature dependent dc magnetization and ac-susceptibility measurements. The...
Magnetic structures of quaternary intermetallic borocarbides RCo2B2C (R=Dy, Ho, Er) (2008)
ElMassalami, M., Moreno, R., Takeya, H., Ouladdiaf, B., Lynn, J. W., Freitas, R. S.
The magnetic structures of the title compounds have been studied by neutron diffraction. In contrast to the isomorphous RNi2B2C compounds wherein a variety of exotic incommensurate modulated...
Specific heat in different magnetic phases of RNi2B2C (R= Gd, Ho, Er): theory and experiment (2008)
Chaves, C. M., Takeya, H., Doerr, M., Michor, H., Rotter, M.
The borocarbides RNi2B2C (R=Gd, Ho, Er) exhibit a large variety of magnetic states and as a consequence rich phase diagrams. We have analyzed the nature of these states by specific heat...
Synthesis and magnetic characterization of TmCo2B2C (2008)
ElMassalami, M., Rapp, R. E., Chaves, F. A. B., Moreno, R., Takeya, H., Ouladdiaf, B., ...
A new quaternary intermetallic borocarbide TmCo2B2C has been synthesized via a rapid-quench of an arc-melted ingot. Elemental and powder-diffraction analyses established its correct stoichiometry and...
On the ferromagnetic structure of the intermetallic borocarbide TbCo2B2C (2008)
ElMassalami, M., Moreno, R., Saeed, R. M., Chaves, F. A. B., Chaves, C. M., Takeya, H., ...
Based on magnetization, specific heat, magnetostriction, and neutron diffraction studies on single-crystal TbCo2B2C, it is found out that the paramagnetic properties, down to liquid nitrogen...
Jaiswal-Nagar, D., Isshiki, T., Kimura, N., Aoki, H., Takeya, H., Ramakrishnan, S., ...
Explorations of the order-disorder transformation in vortex matter in single crystals of tetragonal structured (c/a $\sim$3) borocarbide superconductors, $YNi_2B_2C$ and $LuNi_2B_2C$, reveal that...
Jaiswal-Nagar, D., Thakur, A. D., Ramakrishnan, S., Grover, A. K., Pal, D., Takeya, H.
We present magnetization measurements in single crystals of the tetragonal $YNi_2B_2C$ compound, which exhibit the phenomenon of peak effect as well as the second magnetization peak anomaly for H $>$...
Superfluid Density and Quasiparticle Scattering Rate in Ba_{1-x}K_xFe_2As_2 Single Crystals (2008)
Hashimoto, K., Shibauchi, T., Kasahara, S., Ikada, K., Kato, T., Okazaki, R., ...
We report high-sensitivity microwave measurements of the in-plane penetration depth $\lambda_{ab}$ in several single crystals of hole-doped Fe-based superconductor Ba$_{1-x}$K$_x$Fe$_2$As$_2$. We...
Mukhopadhyay, Sourin, Sheet, Goutam, Nigam, A. K., Raychaudhuri, Pratap, Takeya, H.
We investigate the evolution of superconducting properties by doping non-magnetic impurity in single crystals of YNi2-xPtxB2C (x=0-0.2). With increasing Pt doping the critical temperature (Tc)...
Takeya, H., Ishida, K., Kitagawa, K., Ihara, Y., Onuma, K., Maeno, Y., ...
We have performed $^{69,71}$Ga nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) and muon spin rotation/resonance on the quasi two-dimensional antiferromagnet (AFM)...
Bulk electronic structure of the antiferromagnetic superconducting phase in ErNi2B2C (2007)
Baba, T., Yokoya, T., Tsuda, S., Kiss, T., Shimojima, T., Ishizaka, K., ...
We have performed temperature (T) - dependent laser-photoemission spectroscopy of antiferromagnetic (AF) superconductor ErNi2B2C to study the electronic-structure evolution reflecting the interplay...
Low temperature specific heat of La_{3}Pd_{4}Ge_{4} with U_{3}Ni_{4}Si_{4}-type structure (2007)
Kasahara, S., Fujii, H., Mochiku, T., Takeya, H., Hirata, K.
Low temperature specific heat has been investigated in a novel ternary superconductor La_{3}Pd_{4}Ge_{4} with an U_{3}Ni_{4}Si_{4}-type structure consisting of the alternating BaAl_{4}...
Ihara, Y, Takeya, H, Ishida, K, Michioka, C, Yoshimura, K, Takada, K, ...
Discovery of Li2(Pd,Pt)3B superconductors (2006)
Badica, P., Togano, K., Takeya, H., Hirata, K., Awaji, S., Watanabe, K.
Critical temperature Tc of the Li2(Pd1-xPtx)3B was reported to be 7-8K for x=0 and 2.2-2.8K for x=1. In this article we present our preliminary results on behavior of magnetization-temperature curves...
Ihara, Y., Takeya, H., Ishida, K., Ikeda, H., Michioka, C., Yoshimura, K., ...
Co nuclear-quadrupole-resonance (NQR) measurements were performed on various bilayered hydrate cobaltate Na_x(H_3O)_zCoO_2\cdot yH_2O with different values of the superconducting and...
Structure study of superconducting Li2Pd3B system by neutron powder diffraction (2006)
Mochiku, T, Takeya, H, Wuernisha, T, Mori, K, Ishigaki, T, Kamiyama, T, ...
Anisotropic Behavior of Knight Shift in Superconducting State of Na_xCoO_2yH_2O (2005)
Ihara, Y., Ishida, K., Takeya, H., Michioka, C., Kato, M., Itoh, Y., ...
The Co Knight shift was measured in an aligned powder sample of Na_xCoO_2yH_2O, which shows superconductivity at T_c \sim 4.6 K. The Knight-shift components parallel (K_c) and perpendicular to the...
Mukhopadhyay, S, Sheet, Goutam, Raychaudhuri, P, Takeya, H
We present results of in field directional point contact spectroscopy (DPCS) study in the quaternary borocarbide superconductor YNi2B2C, which is characterized by a highly anisotropic superconducting...
Raychaudhuri, P., Jaiswal-Nagar, D., Sheet, Goutam, Ramakrishnan, S., Takeya, H.
We present a study of the anisotropy in the superconducting energy gap in a single crystal of YNi2B2C (Tc~14.6K) using directional point contact spectroscopy. The superconducting energy gap at 2.7K,...
Superconductivity in metal rich Li-Pd-B ternary Boride (2004)
Togano, K., Badica, P., Nakamori, Y., Orimo, S., Takeya, H., Hirata, K.
8K superconductivity was observed in the metal rich Li-Pd-B ternary system. Structural, microstructural, electrical and magnetic investigations for various compositions proved that Li2Pd3B compound,...
Superconducting gap structure of YNi2B2C determined by thermal conductivity (2003)
Kamata,K., Izawa,K., Nakajima,Y., Matsuda,Y., Watanabe,T., Nohara,M., ...
Superconducting gap structure of YNi2B2C determined by thermal conductivity (2003)
Kamata,K., Izawa,K., Nakajima,Y., Matsuda,Y., Watanabe,T., Nohara,M., ...
Evidence of point nodes in superconducting gap of borocarbide superconductor YNi2B2C (2003)
Kamata,K., Izawa,K., Nakajima,Y., Matsuda,Y., Watanabe,T., Nohara,M., ...
Evidence of point nodes in superconducting gap of borocarbide superconductor YNi2B2C (2003)
Kamata,K., Izawa,K., Nakajima,Y., Matsuda,Y., Watanabe,T., Nohara,M., ...
Massalami, M. El, Takeya, H., Hirata, K., Amara, M., Schmitt, D.
Extensive magnetization and magnetostriction measurements were carried out on a single crystal of GdNi2B2C along the main tetragonal axes. Within the paramagnetic phase, the magnetic and strain...
Magnon Specific Heat of Single Crystal Borocarbides RNi2B2C (R=Tm, Er, Ho, Dy, Tb, Gd) (2003)
Massalami, M. El, Rapp, R. E., Chaves, F. A. B., Takeya, H., Chaves, C. M.
Zero-field specific heat of the single crystals RNi2B2C (R= Er, Ho, Dy, Tb, Gd) was measured within the temperature range 0.1 K
Evidence of point nodes in superconducting gap of borocarbide superconductor YNi2B2C (2003)
Kamata, K., Izawa, K., Nakajima, Y., Matsuda, Y., Watanabe, T., Nohara, M., ...
Superconducting gap structure of YNi2B2C determined by thermal conductivity (2003)
Kamata, K., Izawa, K., Nakajima, Y., Matsuda, Y., Watanabe, T., Nohara, M., ...
Evidence of point nodes in superconducting gap of borocarbide superconductor YNi2B2C (2003)
Kamata, K., Izawa, K., Nakajima, Y., Matsuda, Y., Watanabe, T., Nohara, M., ...
Superconducting gap structure of YNi2B2C determined by thermal conductivity (2003)
Kamata, K., Izawa, K., Nakajima, Y., Matsuda, Y., Watanabe, T., Nohara, M., ...
Spontaneous vortex phase in ErNi2B2C (2001)
Kawano-Furukawa, H., Habuta, E., Nagata, T., Nagao, M., Yoshizawa, H., Furukawa, N., ...
Below T_{WFM} ~ 2.75K, a weak ferromagnetism and superconductivity coexist in ErNi2B2C. In the present paper, a possibility of a spontaneous vortex phase was examined directly by small angle neutron...
Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering (2001)
Takano, Y., Takeya, H., Fujii, H., Kumakura, H., Hatano, T., Togano, K., ...
High-density bulk materials of a newly discovered 40K intermetallic MgB2 superconductor were prepared by high pressure sintering. Superconducting transition with the onset temperature of 39K was...
Low Energy Quasiparticle Excitation in the Vortex State of Borocarbide Superconductor YNi2B2C (2001)
Hirata, K., Izawa, K., Kato, Y., Konczykowski, M., Matsuda, Yuji, ...
Izawa, K., Shibata, A., Matsuda, Yuji, Kato, Y., Takeya, H., Hirata, K., ...
We have measured the low temperature heat capacity Cp and microwave surface impedance Zs in the vortex state of YNi_2B_2C. In contrast to conventional s-wave superconductors, Cp shows a nearly \sqrt...
Neutron scattering studies on CeRhSb and PrTSb (T=Rh and Pd) compounds (1999)
Adroja, D T, Rainford, B D, Malik, S K, Takeya, H, Gschneider, K A, Pecharsky, V K
ANISOTROPIC SUPERCONDUCTIVITY OBSERVED FOR Y1Ba2Cu3Oy SINGLE CRYSTALS BY TORQUE MAGNETOMETRY (1988)
Miyajima, H., Tomita, H., Otani, Y., Yonezama, F., Chikazumi, S., Takeya, H., ...
Magnetic torques were measured on Y1Ba2Cu3Oy single crystals over the temperature range from 4.2 K to RT in magnetic fields up to 10 kOe. The torque curve exhibited a large rotational hysteresis. The...
ANISOTROPIC SUPERCONDUCTIVITY OBSERVED FOR Y1Ba2Cu3Oy SINGLE CRYSTALS BY TORQUE MAGNETOMETRY (1988)
Miyajima, H., Tomita, H., Otani, Y., Yonezama, F., Chikazumi, S., Takeya, H., ...
Magnetic torques were measured on Y1Ba2Cu3Oy single crystals over the temperature range from 4.2 K to RT in magnetic fields up to 10 kOe. The torque curve exhibited a large rotational hysteresis. The...
ANISOTROPIC SUPERCONDUCTIVITY OBSERVED FOR Y1Ba2Cu3Oy SINGLE CRYSTALS BY TORQUE MAGNETOMETRY (1988)
Miyajima, H., Tomita, H., Otani, Y., Yonezama, F., Chikazumi, S., Takeya, H., ...
Magnetic torques were measured on Y1Ba2Cu3Oy single crystals over the temperature range from 4.2 K to RT in magnetic fields up to 10 kOe. The torque curve exhibited a large rotational hysteresis. The...
Takeya, H, Mori, T, Gabazza, E C, Kuroda, K, Deguchi, H, Matsuura, E, ...
beta2-Glycoprotein I (beta2GPI), a plasma glycoprotein with phospholipid-binding property, is known to be the actual target antigen for autoimmune type anticardiolipin antibodies (aCLs). Certain...
Prothrombin kringle 1 domain interacts with factor Va during the assembly of prothrombinase complex.
Deguchi, H, Takeya, H, Gabazza, E C, Nishioka, J, Suzuki, K
The kringle 2 domain of prothrombin has been shown to interact with factor Va during the activation of prothrombin by the prothrombinase complex composed of factor Xa, factor Va, negatively charged...
Takeya, H, Mori, T, Gabazza, E C, Kuroda, K, Deguchi, H, Matsuura, E, ...
beta2-Glycoprotein I (beta2GPI), a plasma glycoprotein with phospholipid-binding property, is known to be the actual target antigen for autoimmune type anticardiolipin antibodies (aCLs). Certain...
Prothrombin kringle 1 domain interacts with factor Va during the assembly of prothrombinase complex.
Deguchi, H, Takeya, H, Gabazza, E C, Nishioka, J, Suzuki, K
The kringle 2 domain of prothrombin has been shown to interact with factor Va during the activation of prothrombin by the prothrombinase complex composed of factor Xa, factor Va, negatively charged...