Shunichi Arisawa
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View article: Structural origin of long-range proximity effect in highly disordered fractal MgO/MgB2 nanocomposites: Roles of interface, geometry, and defect
Structural origin of long-range proximity effect in highly disordered fractal MgO/MgB2 nanocomposites: Roles of interface, geometry, and defect Open
The emergence of global phase coherence due to the proximity effect in heterogeneous and disordered superconductor systems has been an issue of long-standing interest. Recently, we have reported that a highly disordered fractal MgO/MgB2 na…
View article: Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity
Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity Open
We investigate vortex matter in a proximity-coupled $\mathrm{Mg}/\mathrm{MgO}/\mathrm{Mg}{\mathrm{B}}_{2}$ nanocomposite with $\ensuremath{\sim}30$ vol. % of $\mathrm{Mg}{\mathrm{B}}_{2}$ using magneto-optical imaging, scanning superconduc…
View article: Static magnetic field amplification in high-<i>T</i> <sub>c</sub> superconducting flux transformer equipped with multi-turn coil prepared using REBCO tape conductor
Static magnetic field amplification in high-<i>T</i> <sub>c</sub> superconducting flux transformer equipped with multi-turn coil prepared using REBCO tape conductor Open
In this study, a high critical temperature (high- T c ) superconducting flux transformer is prepared using a commercially available REBa 2 Cu 3 O y (REBCO) high- T c superconducting (HTS) tape conductor. The device configuration includes a…
View article: Vortex arrangement in an ultrathin superconducting bilayer disc
Vortex arrangement in an ultrathin superconducting bilayer disc Open
A direct current superconducting quantum interference device (SQUID) fixed on a recently developed superconducting bilayer disc is effective for studying fractional magnetic quantum and fractional vortices. However, such devices cannot mag…
View article: Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity
Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity Open
The proximity effect in normal/superconductor heterostructures is an intriguing phenomenon in that the normal side takes on the properties of a superconductor with an induced gap. However, the structural and pinning properties of vortices …
View article: Observation of multiple fractional quanta in a superconducting bilayer disk with a pinhole
Observation of multiple fractional quanta in a superconducting bilayer disk with a pinhole Open
The magnetic-flux quantum (Φ0) cannot be generally divided into smaller ones in a usual superconductor. If a subdividing path is present, the science and technology of the superconductor drastically change. In previous studies, we experime…
View article: Phase shifter based on an ultrathin superconducting bilayer with a through-hole for a superconducting device
Phase shifter based on an ultrathin superconducting bilayer with a through-hole for a superconducting device Open
Applying a radian phase shift other than 2π is a key issue for superconducting circuits, such as flux qubits. Magnetic flux is useful when generating a phase shift. However, to apply a quantized magnetic flux to a phase shifter, a fine geo…
View article: Phase shifter based on an ultrathin superconducting bilayer with a through-hole for a superconducting device
Phase shifter based on an ultrathin superconducting bilayer with a through-hole for a superconducting device Open
Applying a radian phase shift other than 2π is a key issue for superconducting circuits, such as flux qubits. The magnetic flux is useful when generating a phase shift. However, a quantized magnetic flux accompanying a trapped vortex in a …
View article: Phase shifter based on an ultrathin superconducting bilayer with a through-hole for a superconducting device
Phase shifter based on an ultrathin superconducting bilayer with a through-hole for a superconducting device Open
Applying a radian phase shift other than 2π is a key issue for superconducting circuits, such as flux qubits. The magnetic flux is useful when generating a phase shift. However, a quantized magnetic flux accompanying a trapped vortex in a …
View article: Effective method of forming and detecting a fractional magnetic flux quantum
Effective method of forming and detecting a fractional magnetic flux quantum Open
We developed a minimal method of forming and detecting a fractional magnetic flux quantum in a two-component superconductor fabricated using an ultra-thin niobium bilayer that sandwiches a Josephson barrier. The fractional quantum created …
View article: Preparation of a high- <i>T</i> <sub> <i>c</i> </sub> superconducting magnetic flux transformer with a 100 mm bore coil and static magnetic field transfer at 77 K
Preparation of a high- <i>T</i> <sub> <i>c</i> </sub> superconducting magnetic flux transformer with a 100 mm bore coil and static magnetic field transfer at 77 K Open
Herein, superconducting magnetic flux transformers with pickup coils of diameter 100 mm were prepared using a commercial RE123 high critical temperature (high- T c ) superconductive tape. A superconducting flux transformer requires a close…
View article: Flattened remnant-field distribution in superconducting bilayer
Flattened remnant-field distribution in superconducting bilayer Open
The remnant magnetic-field distribution was examined in a "flux quantum decomposer (FQD)" [Physica C 548 (2018) 44-49] composed of an ultrathin superconducting bilayer, for determining the formation mechanism of a fractional vortex. A step…
View article: Epitaxial Non c-Axis Twin-Free Bi2Sr2CaCu2O8+δ Thin Films for Future THz Devices
Epitaxial Non c-Axis Twin-Free Bi2Sr2CaCu2O8+δ Thin Films for Future THz Devices Open
Thin films of (117) Bi2Sr2Ca2CuO8+δ (Bi-2212) were grown by Molecular Organic Chemical Vapor Deposition (MOCVD) on (110) SrTiO3 and (110) LaAlO3 substrates. Substrates were vicinal with off angles up to 20°. Films are 3D epitaxial and X-ra…
View article: Abnormal Meissner state in a superconducting bilayer
Abnormal Meissner state in a superconducting bilayer Open
An ultrathin superconducting bilayer can admit a monotonic magnetic field when one layer has a slit even in a Meissner state. The rotation of the superconducting quantum phase by a vector potential for the magnetic field is compensated by …
View article: Vortex states in a submicron Bi2212 crystal probed by intrinsic Josephson junctions
Vortex states in a submicron Bi2212 crystal probed by intrinsic Josephson junctions Open
To study the pancake-vortex states confined in a submicron Bi2Sr2CaCu2O8+y (Bi2212) crystal, we have measured the c-axis resistance and I-V characteristics of a stack of intrinsic Josephson junctions with a lateral dimension less than 1 µm…
View article: Experimental formation of a fractional vortex in a superconducting bi-layer
Experimental formation of a fractional vortex in a superconducting bi-layer Open
We report the experimental formation of a fractional vortex generated by using a thin superconducting bi-layer in the form of a niobium bi-layer, observed as a magnetic flux distribution image taken by a scanning superconducting quantum in…