Liquid-metal ion emitters

Gabovich, M. D.

doi:10.1070/pu1983v026n05abeh004407

Cited by 56 publications

(16 citation statements)

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“…The assumed equality of the superconducting gaps nd and d on the nd and d FS sections, respectively, is a consequence of the strong mixing of the electron spectrum branches by the matrix elements of the effective four-fermion interaction Hamiltonian, the interaction being a generalization of the virtual-boson-induced BCS-like contact attraction for an anisotropic system. In the framework of the Bilbro-McMillan model [25] adopted by us there is a possibility to consider two separate equations for nd and d [15]. Thus, one is forced to solve self-consistently a system of three equations for (T ), nd (T ) and d (T ).…”

Section: Theory and Resultsmentioning

confidence: 99%

“…That result, as is demonstrated below, remains correct in a more accurate approach. Nevertheless, our previous considerations [14][15][16] had a significant limitation. Specifically, the treatment of the superconducting phase with CDWs was not self-consistent, which made quite unexpectedly the whole problem more rather than less involved.…”

Section: Introductionmentioning

confidence: 89%

“…At the same time, this limit may be exceeded due to a quite different effect, namely, the presence of a spin-singlet dielectric gap | | on the nested, d, sections of the Fermi surface (FS) [14][15][16]. The corresponding order parameter = | |e iϕ describes chargedensity waves (CDWs), which reduce the energy of the reconstructed insulating or metallic phase below the critical temperature of the structural transition T d .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced paramagnetic limit of the upper critical magnetic field for superconductors with charge-density waves

Gabovich¹,

Войтенко²,

Ekino³

2004

J. Phys.: Condens. Matter

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The paramagnetic limit Hp of the upper critical magnetic field Hc2 in superconductors with charge-density waves has been derived in the framework of the self-consistent approach. The obtained quantity Hp always exceeds the Clogston–Chandrasekhar value HpBCS. Relevant experimental data for inorganic and organic superconductors with Hc2> HpBCS are analysed and are shown to be in qualitative agreement with the proposed theory.

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Section: Theory and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced paramagnetic limit of the upper critical magnetic field for superconductors with charge-density waves

Gabovich¹,

Войтенко²,

Ekino³

2004

J. Phys.: Condens. Matter

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“…Our model however fails for x < 0.063, because a finite magnetic order parameter is not taken into account in our model. The counterintuitive sharp increase of T c with increasing scattering rate in the underdoped samples was actually predicted theoretically in Refs 123,124. Theoretically, this rise is expected in any density-wave superconductor, for both s ++ and s± states, [124][125][126] and is due to a stronger sensitivity of SDW or CDW to disorder than superconductivity. This is the reason why T c increases with Γ, and this is potentially a direction for future studies.…”

Section: Pair Breaking and S± Superconductivity Inmentioning

confidence: 99%

Strong correlations, strong coupling, ands-wave superconductivity in hole-dopedBaFe2As2single crystals

Hardy¹,

Böhmer²,

Medici³

et al. 2016

Phys. Rev. B

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We present a comprehensive study of the low-temperature heat capacity and thermal expansion of single crystals of the hole-doped Ba1−xKxFe2As2 series (0 < x < 1) and the end-members RbFe2As2 and CsFe2As2. A large increase of the Sommerfeld coefficient γn is observed with both decreasing band filling and isovalent substitution (K, Rb, Cs) revealing a strong enhancement of electron correlations and the possible proximity of these materials to a Mott insulator. This trend is well reproduced theoretically by our Density-Functional Theory + Slave-Spin (DFT+SS) calculations, confirming that 122-iron pnictides are effectively Hund metals, in which sizable Hund's coupling and orbital selectivity are the key ingredients for tuning correlations. We also find direct evidence for the existence of a coherence-incoherence crossover between a low-temperature heavy Fermi liquid and a highly incoherent high-temperature regime similar to heavy fermion systems. In the superconducting state, clear signatures of multiband superconductivity are observed with no evidence for nodes in the energy gaps, ruling out the existence of a doping-induced change of symmetry (from s to dwave). We argue that the disappearance of the electron band in the range 0.4 < x < 1.0 is accompanied by a strong-to-weak coupling crossover and that this shallow band remains involved in the superconducting pairing, although its contribution to the normal state fades away. Differences between hole-and electron-doped BaFe2As2 series are emphasized and discussed in terms of strong pair breaking by potential scatterers beyond the Born limit.

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“…Holmes [3] assumed that the stripped electrons were thermalised with the plasma electrons and that this was the source of the electron energy. It has been shown that this is never the case for the HNB and does not occur within the first 0.75 m of the DNB, so at this point the Holmes model has been modified to use the average creation energy of the electrons as the energy source term U e and this quantity is evaluated in the section below.…”

Section: The Source Termsmentioning

confidence: 99%

Space Charge Neutralization in the ITER Negative Ion Beams

Surrey

2007

AIP Conference Proceedings

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A model of the space charge neutralization of negative ion beams, developed from the model due to Holmes, is applied to the ITER heating and diagnostic beams. The Holmes model assumed that the plasma electron temperature was derived from the stripped electrons. This is shown to be incorrect for the ITER beams and the plasma electron temperature is obtained from the average creation energy upon ionization. The model shows that both ITER beams will be fully space charge compensated in the drift distance between the accelerator and the neutralizer. Inside the neutralizer, the plasma over compensates the space charge to the extent that a significant focusing force is predicted. At a certain position in the neutraliser this force balances the defocusing force due to the ions' transverse energy. Under these conditions the beam distribution function can change from Gaussian to Bennett and evidence of such a distribution observed in a multi-aperture, neutralized negative ion beam is presented.

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Liquid-metal ion emitters

Cited by 56 publications

References 0 publications

Enhanced paramagnetic limit of the upper critical magnetic field for superconductors with charge-density waves

Enhanced paramagnetic limit of the upper critical magnetic field for superconductors with charge-density waves

Strong correlations, strong coupling, ands-wave superconductivity in hole-dopedBaFe2As2single crystals

Space Charge Neutralization in the ITER Negative Ion Beams

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