Critical field behavior of a multiply connected superconductor in a tilted magnetic field

Womack, F. N.; Adams, P. W.; Valles, James M.; Catelani, Gianluigi

doi:10.1103/physrevb.100.174505

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…3(a), the reentrant superconductivity phenomenon occurs, i.e., non-zero resistances below T c0 appear again at low temperatures, which has been reported in a large variety of superconductors. [44][45][46][47][48][49][50]55] We have found that the reentrant superconductivity can be obtained in the curved sample at small θ and low currents or at large θ and high currents, as shown in Figs. 3(a) and 6(a).…”

Section: The ρ(T) At High Currentsmentioning

confidence: 71%

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Zhang

et al. 2023

Chinese Phys. B

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High quality Nb films were successfully prepared on both flexible polyimide (PI) and rigid Al2O3 substrates and their transport properties were systematically studied at various applied currents, external magnetic fields, and sample orientations. It is found that a curved Nb/PI film exhibits quite different superconducting transition and vortex dynamics compared to the flat Nb/Al2O3 film. For the curved Nb/PI film, smooth superconducting transitions were obtained at low currents, while unexpected cascade structures are revealed in the ρ(T) curves at high currents. We attribute this phenomenon to the gradient distribution of vortex density together with a variation of superconductivity along the curved film. In addition, reentrant superconductivity was induced in the curved Nb/PI thin film by properly choosing the measurement conditions. We attribute this effect to the vortex pinning from both in-plane vortices and out-of-plane vortices. This work reveals the complex transport properties of curved superconducting thin films, providing important insights for further theoretical investigations and practical developments of flexible superconductors.

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Section: The ρ(T) At High Currentsmentioning

confidence: 71%

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Zhang

et al. 2023

Chinese Phys. B

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“…Despite numerous studies on the angular dependence of transport properties in superconductors with random 0D and 1D defects, these are rare for periodic CDs in metallic [37,38] and copper-oxide superconductors [16,26]. Figure 4a presents the angular dependence of our nanopatterned sample at T = 74 K, which is the same reduced temperature t = 0.96 as used for the pristine reference sample.…”

Section: Resultsmentioning

confidence: 99%

Angle-dependent Magnetoresistance of an Ordered Bose Glass of Vortices in YBa2Cu3O7-δ Thin Films with a Periodic Pinning Lattice

et al. 2023

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The competition between intrinsic disorder in superconducting YBa2Cu3O7−δ (YBCO) thin films and an ultradense triangular lattice of cylindrical pinning centers spaced at 30 nm intervals results in an ordered Bose glass phase of vortices. The samples were created by scanning the focused beam of a helium-ion microscope over the surface of the YBCO thin film to form columns of point defects where superconductivity was locally suppressed. The voltage–current isotherms reveal critical behavior and scale in the vicinity of the second-order glass transition. The latter exhibits a distinct peak in melting temperature (Tg) vs. applied magnetic field (Ba) at the magnetic commensurability field, along with a sharp rise in the lifetimes of glassy fluctuations. Angle-dependent magnetoresistance measurements in constant-Lorentz-force geometry unveil a strong increase in anisotropy compared to a pristine reference film where the density of vortices matches that of the columnar defects. The pinning is therefore, dominated by the magnetic-field component parallel to the columnar defects, exposing its one-dimensional character. These results support the idea of an ordered Bose glass phase.

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“…A second, although smaller, segment of the research effort is focused on novel quantum effects that can arise in BCS superconductors under certain conditions. Examples include non-equilibrium dynamics in Zeeman-limited superconductors [11,12], disorder and correlation effects in thin film systems [13][14][15], phase effects in systems having non-trivial multiply connected geometries [16][17][18], and, of course, quantum entanglement [19,20]. The results reported here fall into the latter category.…”

Section: Introductionmentioning

confidence: 89%

Extreme High-Field Superconductivity in Thin Re Films

Womack,

Young,

Browne

et al. 2020

Preprint

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We report the high-field superconducting properties of thin, disordered Re films via magnetotransport and tunneling density of states measurements. Films with thicknesses in the range of 9 nm to 3 nm had normal state sheet resistances of ∼ 0.2 kΩ to ∼ 1 kΩ and corresponding transition temperatures in the range of 6 K to 3 K. Tunneling spectra were consistent with those of a moderate coupling BCS superconductor. Notwithstanding these unremarkable superconducting properties, the films exhibited an extraordinarily high upper critical field. We estimate their zero-temperature Hc2 to be more than twice the Pauli limit. Indeed, in 6 nm samples the estimated reduced critical field Hc2/Tc ∼ 5.6 T/K is among the highest reported for any elemental superconductor. Although the sheet resistances of the films were well below the quantum resistance RQ = h/4e 2 , their Hc2's approached the theoretical upper limit of a strongly disordered superconductor for which kF ∼ 1.

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Critical field behavior of a multiply connected superconductor in a tilted magnetic field

Cited by 6 publications

References 28 publications

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Cascade excitation of vortex motion and reentrant superconductivity in flexible Nb thin films

Angle-dependent Magnetoresistance of an Ordered Bose Glass of Vortices in YBa2Cu3O7-δ Thin Films with a Periodic Pinning Lattice

Extreme High-Field Superconductivity in Thin Re Films

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