Theory of Nernst effect in high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math>superconductors

Tinh, Bui Duc; Rosenstein, Baruch

doi:10.1103/physrevb.79.024518

Cited by 25 publications

(13 citation statements)

References 35 publications

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“…Further information on the vortex state can be extracted from the magnetothermoelectric effect. In particular in the mixed state the vortices under the thermal force, move in the direction parallel to the temperature gradient T, transfer the magnetic flux, and in this way induce the transverse Nernst voltage [24]. At very low temperatures and high field vortex matter ideally organizes itself into a -usually, but not always -hexagonal vortex lattice and the Nernst effect is generally negligible: this can be qualitatively understood as a result of rigidity of the lattice.…”

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confidence: 99%

High field vortex phase diagram of Fe(Se, Te) thin films

Kawale

Caglieris

Braccini

et al. 2014

Supercond. Sci. Technol.

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We report on the (H,T) vortex phase diagram up to 35 T of Fe(Se,Te) thin films deposited on CaF 2 substrates as determined by resistivity, Nernst effect and critical current measurements. We found the presence of a large region where the vortex are firmly pinned allowing the adoption of chalcogenides for low temperature but extremely high magnetic field applications. The fact that high critical current density values -larger than 1 MA/cm 2 in self field and liquid helium -are reached together with a very weak dependence on the magnetic field and a complete isotropy, joined with the very high rigidity of the vortex lattice at very high field make the Fe(Se,Te) phase very promising for low temperature (≤ 4.2 K) and high field (≥ 25 T) applications.

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confidence: 99%

High field vortex phase diagram of Fe(Se, Te) thin films

Kawale

Caglieris

Braccini

et al. 2014

Supercond. Sci. Technol.

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“…Comparing with the evolution of AFM order with pressure in Fe-based pnictides4344 and chalcogenides4546 whose AFM order can be destroyed at modest pressure below ~10 GPa, the AFM order in the K-doped BaMn 2 Bi 2 exhibits insensitive to pressure. These results demonstrates that the Mn's d 5 electrons in the sample investigated are much more localized than Fe's d 6 electrons in the Fe-based pnictides and Fe-based chalcogenides, which leads to the K-doped BaMn 2 Bi 2 belongs to a strong Hund's AFM metal with a hybridization between localized spin electrons and itinerant electrons.…”

Section: Discussionmentioning

confidence: 99%

Robust antiferromagnetism preventing superconductivity in pressurized (Ba0.61K0.39)Mn2Bi2

Dai

et al. 2014

Sci Rep

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BaMn2Bi2 possesses an iso-structure of iron pnictide superconductors and similar antiferromagnetic (AFM) ground state to that of cuprates, therefore, it receives much more attention on its properties and is expected to be the parent compound of a new family of superconductors. When doped with potassium (K), BaMn2Bi2 undergoes a transition from an AFM insulator to an AFM metal. Consequently, it is of great interest to suppress the AFM order in the K-doped BaMn2Bi2 with the aim of exploring the potential superconductivity. Here, we report that external pressure up to 35.6 GPa cannot suppress the AFM order in the K-doped BaMn2Bi2 to develop superconductivity in the temperature range of 300 K–1.5 K, but induces a tetragonal (T) to an orthorhombic (OR) phase transition at ~20 GPa. Theoretical calculations for the T and OR phases, on basis of our high-pressure XRD data, indicate that the AFM order is robust in the pressurized Ba0.61K0.39Mn2Bi2. Both of our experimental and theoretical results suggest that the robust AFM order essentially prevents the emergence of superconductivity.

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“…In what follows we will use the Hartree - Fock type self-consistent Gaussian approximation (SCGA) 25–28 used in the past to calculate fluctuation contribution to magnetization 29 , Nernst effect 25 and conductivity above T c 30 .…”

Section: The Self - Consistent Approximation Calculation Of the I-v Cmentioning

confidence: 99%

“…(7), is nonlinear, so cannot generally be solved. Since we will need only the thermal averages of quadratic in ψ quantities, like the superfluid density and the electric current, a sufficiently simple and accurate approximation (similar in nature to the Hartree-Fock approximation in the fermionic models) is the gaussian approximation 25,28,29 . The nonlinear | ψ | 2 ψ term in the TDGL Eq.…”

Section: The Self - Consistent Approximation Calculation Of the I-v Cmentioning

confidence: 99%

Dynamical instability of the electric transport in superconductors

Qiao

Postolova

et al. 2018

Sci Rep

Self Cite

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We develop a nonlinear theory of the electronic transport in superconductors in the framework of the time-dependent Ginzburg-Landau (TDGL) equation. We utilize self-consistent Gaussian approximation and reveal the conditions under which the current-voltage V(I) dependence (I-V characteristics) acquires an S-shape form leading to switching instabilities. We demonstrate that in two-dimensions the emergence of such an instability is a hallmark of the Berezinskii-Kosterlitz-Thouless (BKT) transition that we have detected by transport measurements of titanium nitride (TiN) films. Our theoretical findings compare favorably with our experimental results.

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Theory of Nernst effect in high-Tcsuperconductors

Cited by 25 publications

References 35 publications

High field vortex phase diagram of Fe(Se, Te) thin films

High field vortex phase diagram of Fe(Se, Te) thin films

Robust antiferromagnetism preventing superconductivity in pressurized (Ba0.61K0.39)Mn2Bi2

Dynamical instability of the electric transport in superconductors

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