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Heron, D. O. G.; Ray, S. J.; Lister, S. J. S.; Aegerter, Christof M.; Keller, H.; Kes, P.H.; Menon, Gautam I.

doi:10.1103/physrevlett.110.107004

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…35 It is very sensitive to structural changes of the vortex lattice which may occur as a function of temperature and/or magnetic field. [35][36][37][38][39][40] ) and it decreases down to ≃ 0.7 by approaching T c . In general, the change of α sk as a function of magnetic field and temperature is associated with the vortex lattice melting, 36,37,40 and/or dimensional crossover from 3D to 2D type of FLL.…”

mentioning

confidence: 95%

“…[35][36][37][38][39][40] ) and it decreases down to ≃ 0.7 by approaching T c . In general, the change of α sk as a function of magnetic field and temperature is associated with the vortex lattice melting, 36,37,40 and/or dimensional crossover from 3D to 2D type of FLL. 35,37 Both processes are thermally activated and caused by increased vortex mobility via loosing the interplanar or intrapalanar FLL correlations.…”

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confidence: 95%

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Anisotropy induced vortex lattice rearrangement in CaKFe4As4

et al. 2019

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The magnetic penetration depth anisotropy γ λ = λc/λ ab (λ ab and λc are the in-plane and the out-of-plane components of the magnetic penetration depth) in a CaKFe4As4 single crystal sample (the critical temperature Tc ≃ 35 K) was studied by means of muon-spin rotation (µSR). γ λ is almost temperature independent for T 20 K (γ λ ≃ 1.9) and it reaches ≃ 3.0 by approaching Tc. The change of γ λ induces the corresponding rearrangement of the flux line lattice (FLL), which is clearly detected via enhanced distortions of the FLL µSR response. Comparison of γ λ with the anisotropy of the upper critical field (γH c2 ) studied in Phys. Rev B 94, 064501 (2016), reveals that γ λ is systematically higher than γH c2 at low-temperatures and approaches γH c2 for T → Tc. The anisotropic properties of λ are explained by the multi-gap nature of superconductivity in CaKFe4As4 and are caused by anisotropic contributions of various bands to the in-plane and the out-of-plane components of the superfluid density.

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Anisotropy induced vortex lattice rearrangement in CaKFe4As4

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“…[26]. The form of p(B) is strongly related to the spatial correlations of the vortex lattice [27]. To acquire data of sufficient quality for this analysis at least 2 hours of data collection are required for each sample condition (temperature, field), so that the measurements average over this period.…”

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confidence: 99%

Muon-spin rotation measurements of the vortex state in Sr$_2$RuO$_4$: type-1.5 superconductivity, vortex clustering and a crossover from a triangular to a square vortex lattice

Ray,

Gibbs,

Bending

et al. 2014

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Muon-spin rotation has been used to probe vortex state in Sr 2 RuO 4 . At moderate fields and temperatures a lattice of triangular symmetry is observed, crossing over to a lattice of square symmetry with increasing field and temperature. At lower fields it is found that there are large regions of the sample that are completely free from vortices which grow in volume as the temperature falls. Importantly this is accompanied by increasing vortex density and increasing disorder within the vortex-cluster containing regions. Both effects are expected to result from the strongly temperature-dependent long-range vortex attractive forces arising from the multi-band chiral-order superconductivity.

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“…Superconducting vortex-glass and vortex-liquid states are both expected to appear (12,(40)(41)(42)(43) in underdoped LSCO. The vortex motion is involved as long as the SFs are present, which is the case in Fig.…”

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Hall effect in quantum critical charge-cluster glass

Bollinger

Sun

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Upon doping, cuprates undergo a quantum phase transition from an insulator to a d-wave superconductor. The nature of this transition and of the insulating state is vividly debated. Here, we study the Hall effect in La 2-x Sr x CuO 4 (LSCO) samples doped near the quantum critical point at x ∼ 0.06. Dramatic fluctuations in the Hall resistance appear below T CG ∼ 1.5 K and increase as the sample is cooled down further, signaling quantum critical behavior. We explore the doping dependence of this effect in detail, by studying a combinatorial LSCO library in which the Sr content is varied in extremely fine steps, Δx ∼ 0.00008. We observe that quantum charge fluctuations wash out when superconductivity emerges but can be restored when the latter is suppressed by applying a magnetic field, showing that the two instabilities compete for the ground state.high-temperature superconductors | charge glass | superconductorto-insulator transition | quantum fluctuations | Hall effect C larifying the mechanism of the superconductor-insulator transition (SIT) observed at low doping in cuprates is important per se, and more so because it may help crack the enigma of high-temperature superconductivity (HTS). The key question is the nature of the ground state competing with superconductivity (1, 2). Whereas the answer may not inform directly on the pairing mechanism in the HTS phase, it would reveal the nature of another important (competing) term in the (effective, low-energy) Hamiltonian. However, the physical picture is still contentious at present. Even the widespread use of the adjective "insulating" is problematic here because, although the resistivity (ρ) increases as the temperature is lowered, the sample actually remains quite conductive (3-5). Holes hopping in a Mott insulator may account for the electric transport at very low doping levels of such an "insulator." However, in the vicinity of the quantum critical point, the physics gets more complex because of the intrinsic inhomogeneity induced by strong localization and significant spin, charge, and phase fluctuations (6-12). As a result, spin glass (6-9), charge glass (or charge-cluster glass) (10, 11), and superconducting vortex liquid/glass (12) all occur in the x-H-T phase diagram near the SIT. For instance, erratic switching in the (longitudinal) resistivity ρ has been observed (11) at very low temperature in two underdoped superconducting LSCO samples, and was taken as a signature of the charge-glass state. However, the measured amplitude of resistivity fluctuations was relatively small (Δρ/ρ ∼1%) even when the sample was deep in the charge-glass state. This raises a question whether the majority of the carriers are localized, or only a small fraction of carriers are in a glassy state while the rest are still itinerant and homogeneously distributed. Alternatively, the small fluctuation amplitude could have resulted from averaging over the measurement time, or over many small domains. Unfortunately, the methodology adopted in previous experiments did not allow makin...

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Muon-Spin Rotation Measurements of an Unusual Vortex-Glass Phase in the Layered SuperconductorBi2.15Sr1.85CaCu2O8+δ

Cited by 14 publications

References 25 publications

Anisotropy induced vortex lattice rearrangement in CaKFe4As4

Anisotropy induced vortex lattice rearrangement in CaKFe4As4

Muon-spin rotation measurements of the vortex state in Sr$_2$RuO$_4$: type-1.5 superconductivity, vortex clustering and a crossover from a triangular to a square vortex lattice

Hall effect in quantum critical charge-cluster glass

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