Van Hove singularity as a possible origin of the bandwidth renormalization in layered superconductors

Борисенко, С. В.; Kordyuk, A. A.; Zabolotnyy, V. B.; Evtushinsky, D. V.; Kim, T. K.; Büchner, B.; Yaresko, A. N.; Borisenko, V. D.; Berger, H.

doi:10.1016/j.jpcs.2010.10.063

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…3 is the overall bandwidth renormalization of the band structure. While the bands in intercalated sample seem to just shift down, which is natural because of electron doping (and this is the driving mechanism behind the relocation of the singularity), comparison with 2H-NbSe 2 shows that the bandwidth is drastically different 33 . While the electronic structures of 2H-Pd 0.08 TaSe 2 and 2H-NbSe 2 are qualitatively similar, the higher critical temperature in the latter may be explained either by higher density of states close to Fermi level, because of the overall stronger bandwidth renormalization or by better matching the energy of the pairing boson.…”

Section: Resultsmentioning

confidence: 95%

Turning charge-density waves into Cooper pairs

et al. 2020

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The relationship between charge-density waves (CDWs) and superconductivity is a long-standing debate. Often observed as neighbors in phase diagrams, it is still unclear whether they cooperate, compete, or simply coexist. Using angle-resolved photoemission spectroscopy, we demonstrate here that by tuning the energy position of the van Hove singularity in Pd-doped 2H-TaSe 2 , one is able to suppress CDW and enhance superconductivity by more than an order of magnitude. We argue that it is particular fermiology of the material that is responsible for each phenomenon, thus explaining their persistent proximity as phases.

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Section: Resultsmentioning

confidence: 95%

Turning charge-density waves into Cooper pairs

et al. 2020

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“…1): three around the center of the Fe 2 As 2 Brillouin zone and two around the corners. Band structure calculations predict rather similar electronic structure for all the ferro-pnictides and ferrochalcogenides (see [1,2] and references therein) and the angle resolved photoemission spectroscopy (ARPES) [3], the most direct tool to see the real electronic band structure of crystals, shows that it is indeed the case: one can fit the calculated bands to the experiment if it is allowed to renormalize them about 3 times and shift slightly with respect to each other [4,5,6,7]. As a consequence of such a complex band structure, in which several van Hove singularities (vHs) stay close to the Fermi level, the electronic properties of iron based superconductors, as a function of doping, pressure, and the temperature, should be swarm with crossovers.…”

Section: Introductionmentioning

confidence: 87%

Electronic Band Structure of Ferro-Pnictide Superconductors from ARPES Experiment

Kordyuk

Zabolotnyy

Evtushinsky

et al. 2013

J Supercond Nov Magn

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ARPES experiments on iron based superconductors show that the differences between the measured and calculated electronic band structures look insignificant but can be crucial for understanding of the mechanism of high temperature superconductivity. Here we focus on those differences for 111 and 122 compounds and discuss the observed correlation of the experimental band structure with the superconductivity.Keywords ARPES · iron based superconductors · ferro-pnictides · electronic band structure · Fermi surface · high-temperature superconductivity 1 IntroductionOne can safely say that the visiting card of the iron based superconductors is their complex electronic band structure that usually results in five Fermi surface sheets (see Fig. 1): three around the center of the Fe 2 As 2 Brillouin zone and two around the corners. Band structure calculations predict rather similar electronic structure for all the ferro-pnictides and ferrochalcogenides (see [1,2] and references therein) and the angle resolved photoemission spectroscopy (ARPES) [3], the most direct tool to see the real electronic band structure of crystals, shows that it is indeed the case:

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“…Band structure calculations predict rather similar electronic structure for all FeSCs (see [162,163] and references therein). ARPES experiments show that it is indeed the case: one can fit the calculated bands to the experiment if it is allowed to renormalize them about 3 times and shift slightly with respect to each other [50,62,164,165]. In this section, I focus first on the most "arpesable" LiFeAs and BKFA compounds, to discuss their electronic structure in details.…”

Section: Electronic Structure and Tcmentioning

confidence: 99%

Iron-based superconductors: Magnetism, superconductivity, and electronic structure (Review Article)

Kordyuk

2012

Low Temperature Physics

218

155

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Angle resolved photoemission spectroscopy (ARPES) reveals the features of the electronic structure of quasitwo-dimensional crystals, which are crucial for the formation of spin and charge ordering and determine the mechanisms of electron-electron interaction, including the superconducting pairing. The newly discovered ironbased superconductors (FeSC) promise interesting physics that stems, on one hand, from a coexistence of superconductivity and magnetism and, on the other hand, from complex multi-band electronic structure. In this review I want to give a simple introduction to the FeSC physics, and to advocate an opinion that all the complexity of FeSC properties is encapsulated in their electronic structure. For many compounds, this structure was determined in numerous ARPES experiments and agrees reasonably well with the results of band structure calculations. Nevertheless, the existing small differences may help to understand the mechanisms of the magnetic ordering and superconducting pairing in FeSC.

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Van Hove singularity as a possible origin of the bandwidth renormalization in layered superconductors

Cited by 8 publications

References 10 publications

Turning charge-density waves into Cooper pairs

Turning charge-density waves into Cooper pairs

Electronic Band Structure of Ferro-Pnictide Superconductors from ARPES Experiment

Iron-based superconductors: Magnetism, superconductivity, and electronic structure (Review Article)

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