Vortex-core properties and vortex-lattice transformation in FeSe

Putilov, A. V.; Giorgio, C. Di; Vadimov, Vasilii; Trainer, Daniel J.; Lechner, E.; Curtis, J.; Abdel-Hafiez, M.; Волкова, О. С.; Vasiliev, A. N.; Чареев, Д. А.; Karapetrov, G.; Koshelev, A. E.; Aladyshkin, A. Yu.; Mel’nikov, A. S.; Iavarone, M.

doi:10.1103/physrevb.99.144514

Cited by 21 publications

(15 citation statements)

References 77 publications

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“…Regarding the sample quality, the surface attached to the sample holder was microscopically smooth with no indication of faulting planes within the microscopic resolution. Despite not related to our results, we mention that a continuous vortex lattice transformation was observed in FeSe for magnetic fields going from 1 to 6 T for H ab 55 show isofield M (T ) curves obtained for H c-axis and H ab-planes respectively. The well resolved split between the ZFC and FC curves in each M (T ) allowed to obtain the irreversible temperature, T irr as a function of magnetic field (see inset (i) in Fig.…”

Section: Methodscontrasting

confidence: 77%

Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor Pr$_{0.87}$LaCe$_{0.13}$CuO$_4$

Salem-Sugui,

Lopes,

Kern

et al. 2020

Preprint

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Second magnetization peak (SMP) in hole-doped cuprates and iron pnictide superconductors has been widely explored. However, similar feature in the family of electron-doped cuprates is not common. Here, we report the vortex dynamics study in the single crystal of an electron-doped cuprate Pr0.87LaCe0.13CuO4 superconductor using dc magnetization measurements. A SMP feature in the isothermal M (H) was observed for H ab-planes. On the other hand, no such feature was observed for H c-axis in the crystal. Using magnetic relaxation data, a detailed analysis of activation pinning energy via collective creep theory suggests an elastic to plastic creep crossover across the SMP. Moreover, for H ab, a peak in the temperature dependence of critical current density is also observed near 7 K, which is likely be related to a dimensional crossover (3D-2D) associated to the emergence of Josephson vortices at low temperatures. The anisotropy parameter obtained γ ≈ 8-11 indicates the 3D nature of vortex lattice mainly for H c-axis. The H-T phase diagrams for H c and H ab are presented.

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Section: Methodscontrasting

confidence: 77%

Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor Pr$_{0.87}$LaCe$_{0.13}$CuO$_4$

Salem-Sugui,

Lopes,

Kern

et al. 2020

Preprint

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“…We note that a similar transition from a hexagonal vortex lattice to a rectangular vortex lattice in Fourier space is also observed in FeSe [59] and LiFeSe [16]. In these experiments, the transformation is attributed to vortex overlap.…”

Section: From Triangular To Rectangular Vortex Latticesupporting

confidence: 71%

“…In any case, the spatial distribution of the order parameter is not enough for a quantitative description of the vortex distribution. For that purpose, we compute the Fourier transform with respect to the position of the vortices [7,16,59]. Lattice symmetries in real space can be characterized by the pattern of Bragg peaks in the first Brillouin zone.…”

Section: A Weak Disorder Regionmentioning

confidence: 99%

Exploring the vortex phase diagram of Bogoliubov-de Gennes disordered superconductors

Fan¹,

García-García²

2022

Preprint

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The interplay of disorder and magnetic vortices is a recurrent topic of research in the theory of superconductivity. In most of previous approaches, disorder enters in a phenomenological way, namely, it is not the random potential felt by the electrons.Here we address this problem in a fully microscopic model: a two-dimensional disordered superconductor at zero temperature described by the Bogoliubov-de Gennes (BdG) formalism for lattices of sizes up to 100 × 100 where the magnetic field is introduced by the Peierls's substitution. For a not too strong disorder strength, we identify a rich phase diagram in Fourier space as a function of the magnetic field strength. Initially, we observe the expected Abrikosov triangular vortex lattice slightly distorted by disorder. Intriguingly, an increase in the magnetic field leads to an unexpected rectangular lattice which is followed by a vortex glass with only traces of Bragg's peaks but strong vortex repulsion. Finally, a further increases of the field leads to a fully disordered phase where even vortex repulsion is suppressed.We show that these phases can coexist with global phase coherence. Disorder also enhances the critical magnetic field with respect to the clean limit with a maximum for strong disorder strength on the metallic side of the transition.

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“…8 further demonstrates that the observed anisotropy is of low symmetry. Very clearly, this low-symmetric angle dependence is neither compatible with the 4-fold symmetry which is reported for LiFeAs [3,8] nor with a thinkable 2-fold symmetry which would be expected for coupling to a nematic order parameter [63,64]. This is visualized by the dashed solid black curves representing the expected distribution of ξ GL (α) for generic 4-fold and 2-fold symmetries, respectively.…”

Section: Glmentioning

confidence: 66%

Absence of hexagonal to square structural transition in LiFeAs vortex matter

Hoffmann¹,

Schlegel²,

Salazar³

et al. 2022

Preprint

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We investigated magnetic vortices in two stoichiometric LiFeAs samples by means of scanning tunneling microscopy and spectroscopy. The vortices were revealed by measuring the local electronic density of states (LDOS) at zero bias conductance of samples in magnetic fields between 0.5 and 12 T. From single vortex spectroscopy we extract the Ginzburg-Landau coherence length of both samples as 4.4 ± 0.5 nm and 4.1 ± 0.5 nm, in accordance with previous findings. However, in contrast to previous reports, our study reveals that the reported hexagonal to square-like vortex lattice transition is absent up to 12 T both in field-cooling and zero-field-cooling processes. Remarkably, a highly ordered zero field cooled hexagonal vortex lattice is observed up to 8 T. We argue that several factors are likely to determine the structure of the vortex lattice in LiFeAs such as (i) details of the cooling procedure (ii) sample stoichiometry that alters the formation of nematic fluctuations, (iii) details of the order parameter and (iv) magnetoelastic coupling.

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Vortex-core properties and vortex-lattice transformation in FeSe

Cited by 21 publications

References 77 publications

Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor Pr$_{0.87}$LaCe$_{0.13}$CuO$_4$

Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor Pr$_{0.87}$LaCe$_{0.13}$CuO$_4$

Exploring the vortex phase diagram of Bogoliubov-de Gennes disordered superconductors

Absence of hexagonal to square structural transition in LiFeAs vortex matter

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