45 citations · 180 across the 21 of their papers we have counts for
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Accounting the size distribution of HTS granules for the critical current density from magnetic measurements
D. M. Gokhfeld, Yu. S. Gokhfeld
The determination of the critical current density from magnetic hysteresis loops is widely used to characterize and compare superconducting samples. Magnetic hysteresis loops for t…
Larger grains in high-Tc superconductors synthesized by the solid-state reaction route
D. M. Gokhfeld, M. I. Petrov, S. V. Semenov +4
Solid-state synthesis is widely used in exploratory research to study various structural modifications that affect the properties (critical temperature, critical current density, i…
Spontaneous rotation of magnets levitating above high-Tc superconductor
D. M. Gokhfeld, S. Yu. Shalomov, D. B. Sultimov +1
The levitation of a cylindrical permanent magnet over a high-temperature superconductor cooled by liquid nitrogen can be accompanied by spontaneous oscillations and rotation. The r…
Magnetic flux trapping in porous superconductors
Denis Gokhfeld
The magnetization of superconducting samples is influenced by their porosity. In addition to structural modifications and improved cooling, the presence of pores also plays a role…
Surface barrier of holes drilled in a type-II superconductor
Denis Gokhfeld
Holes drilled in a type-II superconductor trap the magnetic flux. Following Clem's flux pinning model, we consider surface pinning as a mechanism for compressing the magnetic flux…
Anisotropy and crystallite misalignment in textured superconductors
D. M. Gokhfeld, S. V. Semenov, M. I. Petrov +2
A misalignment of anisotropic crystallites causes small values of anisotropy and decreases the critical current density of textured polycrystalline superconductors. To relate the c…
Highly Porous Superconductors: Synthesis, Research, and Prospects
D. M. Gokhfeld, M. R. Koblischka, A. Koblischka-Veneva
This paper gives a review of studies of superconductors with a porosity above 50%. The pores in such superconducting materials provide refrigerant penetration, efficient heat dissi…
Analog of the Intertype Superconductivity in Nanostructured Materials
D. M. Gokhfeld, S. I. Popkov, A. A. Bykov
Magnetization hysteresis loops of tin samples with an inverted opal structure are presented. The sample formed by tin particles with the size of 70 and 128 nm is found to be a type…
The circulation radius and critical current density in type-II superconductors
Denis Gokhfeld
A method is proposed for estimating the length scale of currents circulating in superconductors. The estimated circulation radius is used to determine the critical current density…
Use of a sigmoid function to describe second peak in magnetization loops
Denis Gokhfeld
Order-disorder transitions of a vortex lattice transfer type-II superconductors from a low critical current state to a high one. The similar transition between different current st…
Critical current density and trapped field in HTS with asymmetric magnetization loops
Denis Gokhfeld
Applications of the extended critical state model are considered. The trapped magnetic field, the penetration field and the field dependence of the critical current density are ana…
Pinning in a Porous Bi2223
K. Yu. Terentyev, D. M. Gokhfeld, S. I. Popkov +2
The current-voltage characteristics of a porous superconductor Bi2Sr2Ca2Cu3Ox (Bi2223) have been measured at temperature range from 10 to 90 K. The experimental dependences have be…
Secondary peak on asymmetric magnetization loop of type-II superconductors
Denis Gokhfeld
Asymmetric magnetization loops with a second peak effect were parameterized by the extended critical state model. The magnetic field distribution in a sample is considered. Express…
Magnetization asymmetry of type-II superconductors in high magnetic fields
D. M. Gokhfeld, D. A. Balaev, M. I. Petrov +3
Inhomogeneous distribution of the pinning force in superconductor results in a magnetization asymmetry. A model considering the field distribution in superconductor was developed a…
Asymmetry of magnetization curves of textured BSCCO
D. M. Gokhfeld, D. A. Balaev, S. I. Popkov +2
The dependence of magnetization on magnetic field M(H) was measured for textured BSCCO samples for H || c, H || ab at different temperatures. Inclusion of the pinning parameter in…
Pinning Enhancement by Heterovalent Substitution in YREBaCuO
M. I. Petrov, Yu. S. Gokhfeld, D. A. Balaev +4
The intragrain pinning in high- superconductor compounds YREBaCuO with low concentration of RE (La, Ce, Pr) was investigated. Magnetic and tr…
Current - voltage characteristics of break junctions of high- superconductors
D M Gokhfeld, D A Balaev, K A Shaykhutdinov +2
The current-voltage (-) characteristics of break junctions of polycrystalline LaSrCuO, YLuBaCuO, BiPbS…
Description of hysteretic current-voltage characteristics of SNS junctions
Denis Gokhfeld
Simplified model for current-voltage characteristics of weak links is suggested. It is based on an approach considering the multiple Andreev reflection in metallic Josephson juncti…
Computation of current-voltage characteristics of weak links
Denis Gokhfeld
Simplified model for current-voltage characteristics of weak links is suggested. It is based on approach which considers Andreev reflections as responsible for the dissipative curr…
Magnetization loop and critical current of porous Bi-based HTSC
D. M. Gokhfeld, D. A. Balaev, S. I Popkov +2
The magnetization of porous have been investigated. The experimental magnetization hysteretic loops of were described in the frames of Val'…
Andreev reflection in Bi_{1.8}Pb_{0.3}Sr_{1.9}Ca_2Cu_3O_x break junction
D. M. Gokhfeld, D. A. Balaev, K. A. Shaykhutdinov +2
The current-voltage characteristic (CVC) of break junction made from polycrystalline Bi_{1.8}Pb_{0.3}Sr_{1.9}Ca_2Cu_3O_x is investigated. The experimental CVC has hysteretic featur…