Importance of dislocations in vortex creep revealed in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mtext>YNi</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>B</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mtext>C</mml:mtext></mml:mrow></mml:math> by observations in real time and space by STM

Uchiyama, Kazuharu; Suzuki, Satoshi; Kuwahara, Akira; Yamasaki, Keigo; Kaneko, Shigeo; Takeya, Hiroyuki; Hirata, Kazuto; Nishida, N.

doi:10.1016/j.physc.2009.10.118

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…As mentioned by these authors, when increasing the magnetic field, the contrast is reduced and images are washed out. A compromise must be found between imaging speed and resolution [52,172], depending on the experiment to be made. Taking data at a single position as a function of time may be useful to study some dynamic behavior [173].…”

Section: Basic Vortex Imaging Techniquesmentioning

confidence: 99%

“…For imaging, highest resolution is obtained by taking the whole I-V curve, which gives good images up to T c [63]. Highest speed is obtained by imaging at fixed bias voltage [52,172] Tracing the spatial dependence of the tunneling conductance unveils local electronic properties of vortices. The vortex is in itself a rather complex object, where the electronic properties of the superconductor are dominated by phase locked circular Cooper pair currents, which vanish at the center in favor of localized states.…”

Section: Basic Vortex Imaging Techniquesmentioning

confidence: 99%

“…YNi 2 B 2 C. In Ref. [172], authors make fast imaging at low temperatures in the superconductor YNi 2 B 2 C (one image in 15 s at 0.45 K, Fig. 23), and produce vortex motion by increasing slowly the applied magnetic field.…”

Section: H-nbsementioning

confidence: 99%

“…In b, bundles are schematically shown, and the direction of motion of each vortex bundle, as well as the gliding planes are schematically represented. Data and images from Ref [172]…”

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confidence: 99%

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Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Suderow¹,

Guillamón²,

Rodrigo³

et al. 2014

Supercond. Sci. Technol.

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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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Section: Basic Vortex Imaging Techniquesmentioning

confidence: 99%

Section: Basic Vortex Imaging Techniquesmentioning

confidence: 99%

Section: H-nbsementioning

confidence: 99%

“…In b, bundles are schematically shown, and the direction of motion of each vortex bundle, as well as the gliding planes are schematically represented. Data and images from Ref [172]…”

mentioning

confidence: 99%

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