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Sosolik, C. E.; Stroscio, Joseph A.; Stiles, Mark D.; Hudson, Eric; Blankenship, Steven R.; Fein, A. P.; Celotta, Robert

doi:10.1103/physrevb.68.140503

Cited by 40 publications

(27 citation statements)

References 10 publications

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“…In the nonmagnetic nickel borocarbide LuNi 2 B 2 C, when the magnetic field is applied along the c axis of the tetragonal crystal structure, the vortex lattice is square at high fields, with a side along [110] [13,[54][55][56][57]. The interaction between crystal and vortex lattices is mediated by nonlocal effects, which introduce terms in the vortex-vortex interaction whose in-plane behavior depends on the shape of the Fermi surface [13,[54][55][56][57][58][59]. In β-Bi 2 Pd, the vortex lattice is hexagonal and oriented along the in-plane directions of the square crystal lattice [100] and [010].…”

Section: Discussionmentioning

confidence: 99%

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

et al. 2015

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We present very low-temperature scanning tunneling microscopy (STM) experiments on single-crystalline samples of the superconductor β-Bi 2 Pd. We find a single superconducting gap from the zero-field tunneling conductance. However, the magnetic field dependence of the intervortex tunneling conductance is higher than the one expected in a single-gap superconductor. Such an increase in the intervortex tunneling conductance has been found in superconductors with multiple superconducting gaps. We also find that the hexagonal vortex lattice is locked to the square atomic lattice as expected in crystalline superconductors with anisotropic Fermi surfaces. Moreover, we compare the upper critical field H c2 (T ) obtained in our sample with previous measurements and find that H c2 (T ) does not increase by reducing the mean free path. We fit H c2 (T ) and show that multiband Fermi surface is needed to explain the observed behavior. We propose that β-Bi 2 Pd is a single-gap multiband superconductor. We anticipate that single-gap superconductivity might often occur in compounds with anisotropic multiband Fermi surfaces.

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Section: Discussionmentioning

confidence: 99%

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

et al. 2015

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“…[58,220,221]). It is unclear if this is just related to a short mean free path or if other materials related aspects, such as surface corrugation or lattice symmetry have some influence.…”

Section: Heavy Fermionsmentioning

confidence: 99%

Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Suderow¹,

Guillamón²,

Rodrigo³

et al. 2014

Supercond. Sci. Technol.

101

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Abstract. The observation of vortices in superconductors was a major breakthrough in developing the conceptual background for superconducting applications. Each vortex carries a flux quantum, and the magnetic field radially decreases from the center. Techniques used to make magnetic field maps, such as magnetic decoration, give vortex lattice images in a variety of systems. However, strong type II superconductors allow penetration of the magnetic field over large distances, of order of the magnetic penetration depth λ. Superconductivity survives up to magnetic fields where, for imaging purposes, there is no magnetic contrast at all. Static and dynamic properties of vortices are largely unknown at such high magnetic fields. Reciprocal space studies using neutron scattering have been employed to obtain insight into the collective behavior. But the microscopic details of vortex arrangements and their motion remain difficult to obtain. Direct real space visualization can be made using scanning tunneling microscopy and spectroscopy (STM/S). Instead of using magnetic contrast, the electronic density of states describes spatial variations of the quasiparticle and pair wavefunction properties. These are of order of the superconducting coherence length ξ, which is much smaller than λ. In principle, individual vortices can be imaged using STM up to the upper critical field where vortex cores, of size ξ, overlap. In this review, we describe recent advances in vortex imaging made with scanning tunneling microscopy and spectroscopy. We introduce the technique and discuss vortex images which reveal the influence of the Fermi surface distribution of the superconducting gap on the internal structure of vortices, the collective behavior of the lattice in different materials and conditions, and the observation of vortex lattice melting. We consider challenging lines of work, which include imaging vortices in nanostructures, multiband and heavy fermion superconductors, single layers and van-der-Waals crystals, studying current driven dynamics and the liquid vortex phases.

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“…Apart from these favorable properties, STM investigations of this surface are extremely scarce. Except for two investigations of the magnetic flux lines 17 and Josephson tunneling 18 on unreconstructed V 3 Si(001) using STM and STS, to our knowledge no additional STM and STS data are available for this surface. By combining a structural analysis using STM and an investigation of electronic properties with STS we found that the width of the energy gap is virtually independent of the position on the surface, while the symmetry of the gap is affected.…”

Section: Introductionmentioning

confidence: 99%

“…The (001) surface of V 3 Si has attracted particular attention because of the hexagonal-to-square transformation of its vortex lattice structure 17,27,28,29,30 and the occurrence of surface reconstructions. 31,32 The energy gap has been determined by a variety of spatially averaging techniques 33,34,35,36,37,38,39,40,41 yielding two distinct values of the zero-temperature energy gap ∆ 0 either in the range from 1.32 k B T c to 2.7 k B T c or in the range from 0.5 k B T c to 0.95 k B T c .…”

Section: Introductionmentioning

confidence: 99%

Surface reconstruction and energy gap of superconductingV3Si(001)

2009

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A yet unknown surface reconstruction of V3Si(001), which is most likely induced by carbon, is used to investigate the quasi-particle energy gap at the atomic scale by a cryogenic scanning tunneling microscope. The width of the gap was virtually not altered at and close to carbon impurities, nor did it change at different sites of the reconstructed surface lattice. A remarkable modification of the spectroscopic signature of the gap was induced, however, upon moving the tip of the microscope into controlled contact with the superconductor. Spectroscopy of the resulting normal-metalsuperconductor junction indicated the presence of Andreev reflections.

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Real-space imaging of structural transitions in the vortex lattice ofV3Si

Cited by 40 publications

References 10 publications

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

Magnetic field dependence of the density of states in the multiband superconductorβ−Bi2Pd

Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Surface reconstruction and energy gap of superconductingV3Si(001)

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