Niobium in clean limit: an intrinsic type-I superconductor

• URL: http://arxiv.org/abs/2207.11829v1
• Date: Sun, 24 Jul 2022 22:15:25 GMT
• Title: Niobium in clean limit: an intrinsic type-I superconductor
• Authors: Ruslan Prozorov, Mehdi Zarea, James A. Sauls
• Abstract summary: We show that pure niobium is a type-I superconductor in the clean limit. However, disorder pushes it to become a type-II superconductor.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Niobium is one of the most researched superconductors, both theoretically and experimentally. It is enormously significant in all branches of superconducting applications, from powerful magnets to quantum computing. It is, therefore, imperative to understand its fundamental properties in great detail. Here we use the results of recent microscopic calculations of anisotropic electronic, phonon, and superconducting properties, and apply thermodynamic criterion for the type of superconductivity, more accurate and straightforward than a conventional Ginzburg-Landau parameter $\kappa$ - based delineation, to show that pure niobium is a type-I superconductor in the clean limit. However, disorder (impurities, defects, strain, stress) pushes it to become a type-II superconductor.

Related papers

• Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
  We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
  arXiv  Detail & Related papers  (2024-10-18T22:25:50Z)
• Can the noble metals (Au, Ag and Cu) be superconductors? [0.0]
  We present a generalization of a BCS theory of superconductivity in good metals under thin-film confinement. We predict that ultra-thin films of gold, silver and copper of suitable thickness could be superconductors at low but experimentally accessible temperatures.
  arXiv  Detail & Related papers  (2024-06-24T13:07:13Z)
• Superfluid stiffness of twisted multilayer graphene superconductors [1.374933941124824]
  We report the measurement of $rho_s$ in magic-angle twisted trilayer graphene (TTG) We find a linear temperature dependence of $rho_s$ at low temperatures and nonlinear Meissner effects in the current bias dependence. Our results provide strong evidence for nodal superconductivity in TTG and put strong constraints on the mechanisms of these graphene-based superconductors.
  arXiv  Detail & Related papers  (2024-06-19T18:00:04Z)
• Superfluid Stiffness and Flat-Band Superconductivity in Magic-Angle Graphene Probed by cQED [0.32018750515900324]
  Superconductivity in magic-angle twisted bilayer graphene (MATBG) is a topic of keen interest in moir'e systems research. We use DC-transport and microwave circuit quantum electrodynamics to measure directly the superfluid stiffness of MATBG. Our findings indicate that MATBG is an unconventional superconductor with an anisotropic gap and strongly suggest a connection between quantum geometry, superfluid stiffness, and unconventional superconductivity.
  arXiv  Detail & Related papers  (2024-06-19T18:00:02Z)
• Quantum thermodynamics with a single superconducting vortex [44.99833362998488]
  We demonstrate complete control over dynamics of a single superconducting vortex in a nanostructure. Our device allows us to trap the vortex in a field-cooled aluminum nanosquare and expel it on demand with a nanosecond pulse of electrical current.
  arXiv  Detail & Related papers  (2024-02-09T14:16:20Z)
• Anisotropic superconductivity of niobium based on its response to non-magnetic disorder [0.0]
  Niobium is one of the most studied superconductors, both theoretically and experimentally. In addition to power applications in alloys, pure niobium is used for sensitive magneto-sensing, radio-frequency cavities, and, more recently, as circuit metallization layers in superconducting qubits.
  arXiv  Detail & Related papers  (2022-07-28T22:24:27Z)
• First design of a superconducting qubit for the QUB-IT experiment [50.591267188664666]
  The goal of the QUB-IT project is to realize an itinerant single-photon counter exploiting Quantum Non Demolition (QND) measurements and entangled qubits. We present the design and simulation of the first superconducting device consisting of a transmon qubit coupled to a resonator using Qiskit-Metal.
  arXiv  Detail & Related papers  (2022-07-18T07:05:10Z)
• Thermal self-oscillations in monolayer graphene coupled to a superconducting microwave cavity [58.720142291102135]
  We observe thermal self-oscillations in a monolayer graphene flake coupled to superconducting resonator. The experimental observations fit well with theoretical model based on thermal instability. The modelling of the oscillation sidebands provides a method to evaluate electron phonon coupling in disordered graphene sample at low energies.
  arXiv  Detail & Related papers  (2022-05-27T15:38:41Z)
• Intrinsic mechanisms for drive-dependent Purcell decay in superconducting quantum circuits [68.8204255655161]
  We find that in a wide range of settings, the cavity-qubit detuning controls whether a non-zero photonic population increases or decreases qubit decay Purcell. Our method combines insights from a Keldysh treatment of the system, and Lindblad theory.
  arXiv  Detail & Related papers  (2021-06-09T16:21:31Z)
• Topological superconductor from superconducting topological surface states and fault-tolerant quantum computing [6.394072140094434]
  A widely believed chiral $p$-wave superfluid is the Moore-Read state in the $nu=frac52$ fractional quantum Hall effect. Here we report a new mechanism for realizing 2D chiral $p$-wave superconductors on the surface of 3D $s$-wave superconductors.
  arXiv  Detail & Related papers  (2020-03-26T06:07:06Z)
• Thermoelectricity in Quantum-Hall Corbino Structures [48.7576911714538]
  We measure the thermoelectric response of Corbino structures in the quantum Hall effect regime. We predict a figure of merit for the efficiency of thermoelectric cooling which becomes very large for partially filled Landau levels.
  arXiv  Detail & Related papers  (2020-03-03T19:19:28Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.