Publications (21)
Magnetic field-induced insulator-semimetal transition in a pyrochlore Nd2Ir2O7
K. Ueda, J. Fujioka, B. -J. Yang +6
We have investigated magneto-transport properties in a single crystal of pyrochore-type Nd2Ir2O7. The metallic conduction is observed on the antiferromagnetic domain walls of the a…
Cu- and Cl-NMR Studies of Triplet Localization in the Quantum Spin System NHCuCl
H. Inoue, S. Tani, S. Hosoya +12
Cu- and Cl-NMR experiments were performed to investigate triplet localization in the dimer compound NHCuCl, which shows magnetization plateaus a…
Improved critical current densities in MgB2 tapes with ZrB2 doping
Xianping Zhang, Zhaoshun Gao, Dongliang Wang +4
MgB2/Fe tapes with 2.5-15 at.% ZrB2 additions were prepared through the in situ powder-in-tube method. Compared to the pure tape, a significant improvement in the in-field critical…
Large irreversibility field in nanoscale C-doped MgB2/Fe tape conductors
Yanwei Ma, Xianping Zhang, S. Awaji +5
We investigated the effect of nanoscale-C doping on the critical current density Jc and irreversibility field Birr of Fe-sheathed MgB2 tapes prepared by the in-situ powder-in-tube…
Insulating phase of a two-dimensional electron gas in MgZnO/ZnO heterostructure below nu = 1/3
Y. Kozuka, A. Tsukazaki, D. Maryenko +7
We report magnetotransport properties of a two-dimensional electron gas confined at MgZnO/ZnO heterointerface in a high magnetic field up to 26 T. High electron mobility and low ch…
Quantum Hall effect in a bulk antiferromagnet EuMnBi with magnetically confined two-dimensional Dirac fermions
H. Masuda, H. Sakai, M. Tokunaga +11
For the innovation of spintronic technologies, Dirac materials, in which the low-energy excitation is described as relativistic Dirac fermions, are one of the most promising system…
Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
H. Sakai, Y. Tokiwa, P. Opletal +7
The superconducting (SC) phase diagram in uranium ditelluride is explored under magnetic fields () along the hard magnetic b-axis using a high-quality single crystal with $T_{\r…
Enhanced critical current density of MgB2 superconductor synthesized in high magnetic fields
Yanwei Ma, Aixia Xu, Xianping Zhang +3
The effect of high magnetic fields on the current carrying properties of both MgB2 bulks and Fe-sheathed tapes was investigated following different thermal sequences. It is found t…
Self-reconstruction of order parameter in spin-triplet superconductor UTe
Y. Tokiwa, P. Opletal, H. Sakai +10
We investigate the effect of easy-axis metamagnetic crossover on superconductivity in UTe along the -axis through measurements of AC susceptibility, magnetization, and the m…
Anomalous vortex dynamics in spin-triplet superconductor UTe
Y. Tokiwa, H. Sakai. S. Kambe, P. Opletal +7
The vortex dynamics in the spin-triplet superconductor, UTe, are studied by measuring the DC electrical resistivity with currents along the -axis under magnetic fields along…
Numerical evaluation of AC losses in an HTS insert coil for high field magnet during its energization
K. Kajikawa, S. Awaji, K. Watanabe
AC losses in a high temperature superconducting (HTS) insert coil for a 25-T cryogen-free superconducting magnet are numerically calculated during its energization, assuming slab a…
NMR Study on the Vortex Slush Phase in Organic Superconductor κ-(BEDT-TTF)2Cu(NCS)2
M. Urano, J. Tonishi, H. Inoue +10
The vortex state in a single crystal of the layered organic superconductor κ-(BEDT-TTF2Cu(NCS)2, where BEDT-TTF (or ET) is bis(ethylenedithio)tetrathiafulvalene, was studied by 1H…
Effect of nano-C doping on the in-situ processed MgB2 tapes
Xianping Zhang, Yanwei Ma*, Aixia Xu +6
The effect of nano-C doping on the microstructure and superconducting properties of Fe-sheathed MgB2 tapes prepared through the in-situ powder-in-tube method was studied. Heat trea…
Electric Quadrupolar Contributions in the Magnetic Phases of UNiB
T. Yanagisawa, H. Matsumori, H. Saito +10
We present acoustic signatures of the electric quadrupolar degrees of freedom in the honeycomb-layer compound UNiB. The transverse ultrasonic mode shows softening belo…
Cu-NMR study on the disordered quantum spin magnet with the Bose-glass ground state
T. Fujiwara, H. Inoue, A. Oosawa +9
Cu-NMR study has been performed on the disordered spin-gap system Tl1-xKxCuCl3 In the high-field H > HC=Î/μ_B, where Îis the spin-gap, the hyperfine field becomes extremely inho…
Discovery of Li2(Pd,Pt)3B superconductors
P. Badica, K. Togano, H. Takeya +3
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…
Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)Se heterostructures
Y. Satake, J. Shiogai, G. P. Mazur +9
Three-dimensional topological insulators (3D-TIs) possess a specific topological order of electronic bands, resulting in gapless surface states via bulk-edge correspondence. Exotic…
Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe
Y. Tokiwa, . P. Opletal, H. Sakai +8
The normal-conducting state of the superconductor UTe is studied by entropy analysis for magnetic fields along the -axis, obtained from magnetization using the relation $(\p…
Improved properties of epitaxial YNixMn1-xO3 films by annealing under high magnetic fields
Yanwei Ma, Aixia Xu, Xiaohang Li +4
The effect of annealing under a magnetic field on the microstructure and properties of YNixMn1-xO3 (x=0.33 and 0.5) films has been investigated. It is found that the ferromagnetic…
A cheap liquid additive from acetone for strong in-field Jc enhancement in MgB2 conductors
Dongliang Wang, Yanwei Ma, Zhaoshun Gao +5
We report on significant flux pinning enhancement in MgB2/Fe tapes that has been easily obtained by a simple and cheap route using acetone as both an efficient ball-milling medium…
Fabrication and some properties of biaxially aligned Sr0.6K0.4Fe2As2 superconductors by processing in high magnetic field
Zhaoshun Gao, Xianping Zhang, Dongliang Wang +7
We fabricated the c axis and ab-plane biaxially aligned Sr0.6K0.4Fe2As2 superconductor using a two-step magnetic field procedure. The effect of magnetic fields on the structure and…