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Article
Open AccessBulk evidence of anisotropic s-wave pairing with no sign change in the kagome superconductor CsV3Sb5
The recently discovered kagome superconductors AV3Sb5 (A = K, Rb, Cs) exhibit unusual charge-density-wave (CDW) orders with time-reversal and rotational symmetry breaking. One of the most crucial unresolved issue...
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Article
Open AccessUsing controlled disorder to probe the interplay between charge order and superconductivity in NbSe2
The interplay between superconductivity and charge-density wave (CDW) in 2H-NbSe2 is not fully understood despite decades of study. Artificially introduced disorder can tip the delicate balance between two compet...
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Article
Manifestations of Surface States in the Longitudinal Magnetoresistance of an Array of Bi Nanowires
The longitudinal magnetoresistance of the array of parallel-oriented bismuth nanowires each 100 nm in diameter grown by electrochemical deposition in nanopores of an Al2O3 membrane has been studied in magnetic fi...
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Article
Geometrical Confinement Effects in Layered Mesoscopic Vortex Matter
We study the geometrical confinement effect in Bi \(_{2}\) ...
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Article
Effect of Quenched Disorder in the Entropy-Jump at the First-Order Vortex Phase Transition of Bi \(_{2}\) Sr \(_{2}\) CaCu \(_{2}\) O \(_{8 + \delta }\)
We study the effect of quenched disorder in the thermodynamic magnitudes entailed in the first-order vortex phase transition of the extremely layered Bi ...
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Article
Disorder-induced topological change of the superconducting gap structure in iron pnictides
In superconductors with unconventional pairing mechanisms, the energy gap in the excitation spectrum often has nodes, which allow quasiparticle excitations at low energies. In many cases, such as in d-wave cuprat...
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Article
Orbital quantization in a system of edge Dirac fermions in nanoperforated graphene
The dependence of the electric resistance R of nanoperforated graphene samples on the position of the Fermi level E F, which is varied by the gate voltage V g, has ...
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Article
Aharonov-bohm effect on multiwall carbon nanotubes under conditions close to strong carrier localization
The Aharonov-Bohm effect on multiwall carbon nanotubes has been studied under conditions of resistance with decreasing temperature as an inverse power function, which precede strong carrier localization. A per...
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Article
Probing the mechanism of interaction of Josephson vortices and pancake vortex lines in Bi2Sr2CaCu2O8 + x with columnar defects
Attractive interaction between pancake-vortex lines (PVLs) and Josephson vortices (JVs) in layered high-temperature superconductors is attributed to the local polarization of PVL at a crossing point by the cur...
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Article
Melting of heterogeneous vortex matter: The vortex ‘nanoliquid’
Disorder and porosity are parameters that strongly influence the physical behavior of materials, including their mechanical, electrical, magnetic and optical properties. Vortices in superconductors can provide...
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Article
Amorphous Vortex Phase in Bi2Sr2CaCu2O8 After the First Order Liquid-Solid Phase Transition
It is widely accepted that the first-order vortex liquid-solid phase transition is associated with a crystalline solid phase and the second order transition with an amorphous one. The combination of a techniqu...
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Chapter and Conference Paper
Angular Dependence of Josephson Plasma Resonance in Bi2Sr2CaCu2O8+y with Columnar Defects
Interlayer phase coherence (IPC) in Bi2Sr2CaCu2O8+y (BSCCO) with columnar defects (CDs) tilted away from the c-axis was studied by using Josephson plasma resonance (JPR). IPC in the vortex liquid state shows nonm...
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Chapter and Conference Paper
Anomalous Microwave Response and Upper Critical Field in Overdoped Tl2Ba2CuO6+δ
The transmittivity T H and microwave surface impedance Zs = Rs+iXs have been measured in order to clarify the unusual dc resistive transition of overdoped Tl2Ba2Cu2O6+δ in magnetic field. The tran...
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Article
Flux Flow Resistance and Transmittivity in Overdoped Tl2Ba2CuO6+δ
We have measured the surface resistance and transmittivity of overdoped Tl 2 Ba 2 CuO 6+δ in magnet...
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Article
Enhancement of Interlayer Phase Coherence in the Vortex Liquid State of Bi2Sr2CaCu2O8+y with Columnar Defects
We studied the phase coherence in the vortex liquid state of Bi 2 Sr 2 CaCu 2 O 8+y
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Chapter and Conference Paper
Bose-glass Vortex Phase and Pinning by Columnar Defects in HTSC Crystals
It is shown that columnar pins introduced into high temperature superconductor (HTSC) single crystals by means of fast-heavy ion-irradiation turn the vortex system into the Bose-glass phase. Experimental evide...
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Article
Pinning in BSCCO above the ordinary irreversibility line
Frequency-dependent observations of magnetic flux structures are used to show that pinning plays a principal role in the whole mixed state in Bi2Sr2CaCu2O8 (BSCCO) single crystals. We speculate that the random pi...
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Article
Phase diagram of Bi2Sr2CaCu2O8 in the mixed state: effects of anisotropy and disorder
The vortex-lattice phase transitions in Bi2Sr2CaCu2O8 crystals with various oxygen stoichiometry and artificially induced disorder are studied using local magnetization measurements. The first-order phase transit...
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Article
Observation of defect-independent ab-plane vortex dynamics in YBa2Cu3O7 single crystals with the third harmonic transmittivity measurements
Anisotropic vortex dynamics of YBa2Cu3O7 single crystals with heavy-ion induced parallel and canted columnar defects are investigated and compared with that of the as-grown single crystals. Novel vortex dynamics ...
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Article
Pinning-to-barrier crossover in YBa2Cu3O7−δ single crystals
The behaviour of magnetic flux in high purity untwinned YBa2Cu3O7−δ (YBCO) single crystals is visualised by means of the magneto-optical technique. It is observed that after zero field-cooling at high temperature...
