Evolution of the Local Superconducting Density of States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ErRh</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Close to the Ferromagnetic Transition

Crespo, V.; Rodrigo, José A.; Suderow, Hermann; Vieira, S.; Hinks, D. G.; Schuller, I. K.

doi:10.1103/physrevlett.102.237002

Cited by 11 publications

(12 citation statements)

References 33 publications

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“…For example, in Ref. [117], the reduction of temperature induced smearing was relevant to determine the temperature dependence of the sample's density of states in ErRh 4 B 4 . In 2H-NbSe 2 , it was used to determine the peculiar temperature dependence of the multigap structure.…”

Section: Superconducting Tipsmentioning

confidence: 99%

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: Superconducting Tipsmentioning

confidence: 99%

Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Suderow¹,

Guillamón²,

Rodrigo³

et al. 2014

Supercond. Sci. Technol.

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“…Such a SC is called ferromagnetic SC [9]. Using this technique, several SCs have been shown to have the coexistence of ferromagnetism and superconductivity including ErRh [10,11], ErNi2B2C [12], UGe2 [14], URhGe 15], NiBi3 [17]. For magnetic SCs, the triplet nature often requires further verification because these materials often contain magnetic elements where sample uniformity and purity may also cause ferromagnetism in the samples [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Singlet superconductivity in a single-crystal NiBi₃ superconductor

Zhao

Gong

et al. 2018

Supercond. Sci. Technol.

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Andreev reflection spectroscopy with unpolarized and highly spin-polarized currents has been utilized to study an intermetallic single-crystal superconductor NiBi3.Magnetoresistance at zero bias voltage of point contacts shows the occurrence and suppression of Andreev reflection by unpolarized and polarized current, respectively. The gap value, its symmetry and temperature dependence have been determined using an unpolarized current. The spin state in the NiBi3 sample is determined to be antiparallel using a highly spin-polarized current. The gap value 2/kBT, gap symmetry and its temperature dependence, combined with the antiparallel spin state show that the bulk NiBi3 is a singlet s-wave superconductor.

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“…Successive transitions between superconductivity and other ordered states are observed in Chevrel phase and borocarbide compounds. [11][12][13][14][15][16][17][18] Superconducting properties have been shown to be enhanced by an external field. [19][20][21][22][23] In heavy fermions and in hybrid proximity ferromagnetic-superconducting structures, magnetism can induce unconventional p-wave or other forms of complex superconductivity.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and magnetism on flux-grown single crystals of NiBi3

et al. 2013

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We present resistivity, magnetization, and specific-heat measurements on flux-grown single crystals of NiBi 3 . We find typical behavior of a type-II superconductor, with, however, a sizable magnetic signal in the superconducting phase. There is a hysteretic magnetization characteristic of a ferromagnetic compound. By following the magnetization as a function of temperature, we find a drop at temperatures corresponding to the Curie temperature of ferromagnetic amorphous Ni. Thus, we assign the magnetism in NiBi 3 crystals to amorphous Ni impurities.

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Evolution of the Local Superconducting Density of States inErRh4B4Close to the Ferromagnetic Transition

Cited by 11 publications

References 33 publications

Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Singlet superconductivity in a single-crystal NiBi₃ superconductor

Superconductivity and magnetism on flux-grown single crystals of NiBi3

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Evolution of the Local Superconducting Density of States inErRh4B4Close to the Ferromagnetic Transition

Cited by 11 publications

References 33 publications

Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Imaging superconducting vortex cores and lattices with a scanning tunneling microscope

Singlet superconductivity in a single-crystal NiBi3 superconductor

Superconductivity and magnetism on flux-grown single crystals of NiBi3

Contact Info

Product

Resources

About

Singlet superconductivity in a single-crystal NiBi₃ superconductor