Vortex lattices in type-II superconductors studied by small-angle neutron scattering

Eskildsen, M. R.

doi:10.1007/s11467-011-0214-z

Cited by 25 publications

(32 citation statements)

References 92 publications

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“…When normalized to the incident neutron flux, this yields the VL reflectivity which can be related directly to form factors. 40 In the present case, however, this is not feasible because the effective sample area and thickness depend on Ω, and, more importantly, part of the neutron beam may pass between the mounting plates for fields close to the basal plane. Still, for a given Ω, the ratio of the SF and NSF scattered intensity may be measured accurately by adding the integrated intensity of the Zeeman split peaks in the rocking curve and dividing the sum by the intensity of the peak at ϕ = ϕ 0 , Fig.…”

Section: Resultsmentioning

confidence: 90%

“…The magnitude of the VL scattered intensity is determined by the amplitude of the field modulation and is proportional to |h| 2 , where the form factor, h(q), is the Fourier transform of the magnetic induction, B(r). 40 In typical VL SANS experiments the form factor is due solely to the modulation of the longitudinal component of B(r) in the plane perpendicular to the applied field direction, denoted h z in Fig. 1(c).…”

Section: Resultsmentioning

confidence: 99%

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Simultaneous evidence for Pauli paramagnetic effects and multiband superconductivity inKFe2As2by small-angle neutron scattering studies of the vortex lattice

et al. 2016

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We study the intrinsic anisotropy of the superconducting state in KFe2As2, using small-angle neutron scattering to image the vortex lattice as the applied magnetic field is rotated towards the FeAs crystalline planes. The anisotropy is found to be strongly field dependent, indicating multiband superconductivity. Furthermore, the high field anisotropy significantly exceeds that of the upper critical field, providing further support for Pauli limiting in KFe2As2 for field applied in the basal plane. The effect of Pauli paramagnetism on the unpaired quasiparticles in the vortex cores is directly evident from the ratio of scattered intensities due to the longitudinal and transverse vortex lattice field modulation.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Simultaneous evidence for Pauli paramagnetic effects and multiband superconductivity inKFe2As2by small-angle neutron scattering studies of the vortex lattice

et al. 2016

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“…According to our results, it is expected that the structural phase transition will occur in the vortex state under the c-axis magnetic field. If it were be observed by a small-angle neutron scattering (SANS) measurement 48 , for instance, clear evidence for both nematic order and chiral superconductivity would be obtained.…”

Section: Summary and Discussionmentioning

confidence: 99%

Chiral superconductivity in nematic states

Takamatsu

Yanase

2015

Phys. Rev. B

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We investigate chiral superconductivity which occurs in the electronic nematic state. A vortex state in a c-axis magnetic field is studied on the basis of the two-component Ginzburg-Landau model for nematic-chiral superconductors. It is shown that various vortex lattice structures are stabilized by nontrivial cooperation of nematicity and chirality in superconductors. In particular, the vortex lattice structural transition occurs when a square anisotropy parameter ν is positive (negative) and the nematicity is induced along the [110] axis ([100] axis). We discuss nematic-chiral superconductivity in URu2Si2, Sr2RuO4, and UPt3. An experimental test for the examination of nematic order and chiral superconductivity is proposed.

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“…32 An approximate expression for F (Q) can be obtained from the solution to the London equation by introducing an ad-hoc cut-off due to the finite vortex core size. This leads to…”

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confidence: 99%

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

et al. 2017

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We studied thermal and dynamic history effects in the vortex lattice (VL) near the order-disorder transition in clean NbSe2 single crystals. Comparing the evolution of the effective vortex pinning and the bulk VL structure, we observed metastable superheated and supercooled VL configurations that coexist with a hysteretic effective pinning response due to thermal cycling of the system. A novel scenario, governed by the interplay between (lower) elastic and (higher) plastic energy barriers, is proposed as an explanation for our observations: Plastic barriers, which prevent the annihilation or creation of topological defects, require dynamic assistance to be overcome and to achieve a stable VL at each temperature. Conversely, thermal hysteresis in the pining response is ascribed to low energy barriers, which inhibit rearrangement within a single VL correlation volume and are easily overcome as the relative strength of competing interactions changes with temperature.

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Vortex lattices in type-II superconductors studied by small-angle neutron scattering

Cited by 25 publications

References 92 publications

Simultaneous evidence for Pauli paramagnetic effects and multiband superconductivity inKFe2As2by small-angle neutron scattering studies of the vortex lattice

Simultaneous evidence for Pauli paramagnetic effects and multiband superconductivity inKFe2As2by small-angle neutron scattering studies of the vortex lattice

Chiral superconductivity in nematic states

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

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