Search for ferromagnetic order in overdoped copper-oxide superconductors

Wu, J.; Lauter, Valeria; Ambaye, Hailemariam; He, Xi; Božović, I.

doi:10.1038/srep45896

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…ARPES, STM and our own THz data, pointing to "Dynes-superconductor" physics [31][32][33][34][35] But this pair breaking does not originate from magnetic impurities [65], as it does in BCS-Abrikosov-Gorkov theory. In fact the origin of the strong residual (T→0) fermionic Drude response is likely the central mystery in overdoped cuprates.…”

Section: Extensive Pair-breaking Has Been Clearly Observed Inmentioning

confidence: 73%

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Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?

Božović

Bollinger

et al. 2018

Low Temperature Physics

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For overdoped cuprates, it is believed that the normal state behaves as an ordinary Fermi liquid while the superconducting state conforms to the BCS theory. We have put these beliefs to the test by a comprehensive experiment in which over two thousand cuprate films were synthesized by molecular beam epitaxy and studied in great detail and precision. Here, we compare our key experimental results to various proposed explanations based on BCS theory extended to dirty d-wave superconductors, including the cases of strong (unitary) and weak (Born) scattering on impurities. The discrepancies seem insurmountable, and point to the need to develop the theory further, likely beyond the canonical BCS paradigm.

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Section: Extensive Pair-breaking Has Been Clearly Observed Inmentioning

confidence: 73%

“…However, none of these has been observed so far in overdoped LSCO. We have also looked for hypothetical competing ferromagnetic order [64] but observed none [65]. (The same experiment also ruled out the presence of a large density of magnetic impurities.…”

Section: We See No Other Phase(s) Experimentallymentioning

confidence: 97%

Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?

Božović

Bollinger

et al. 2018

Low Temperature Physics

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“…Although d-wave superconductivity can be suppressed with FM fluctuations in cuprate superconductors 39 , careful consideration is required for the quantitative assessment of supercon-ductivity suppression. Indeed, some studies have suggested that FM fluctuations are not related to the disappearance of superconductivity in overdoped cuprates 40 .…”

Section: Summary and Discussionmentioning

confidence: 99%

Effect of on-site Coulomb repulsion on ferromagnetic fluctuations in heavily over-doped cuprates

Teranishi,

Nishiguchi,

Yunoki

et al. 2020

Preprint

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We theoretically study ferromagnetic (FM) fluctuations that are experimentally observed in the heavily overdoped region of cuprate superconductors. To explore the origin of FM fluctuations, we evaluate the spin susceptibilities of a single-band Hubbard model within the fluctuation exchange approximation. Model parameters are derived using the Wannierization technique and the constrained random phase approximation method based on the maximally localized Wannier functions. The constrained random phase approximation calculations reveal that the on-site Coulomb interaction decreases with an increase in hole doping. By taking this reduction of the on-site Coulomb interaction into account, the emergence of FM fluctuations in heavily overdoped cuprates can be explained.

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“…Competing ferromagnetic fluctuations have been proposed 77,78 and experimental evidence for 79,80 and against 81 such fluctuations has been reported. It is important to note that an alternative description of overdoped cuprates based dirty on d-wave BCS theory has been proposed 72,82 , though it has faced some rebuttal by others 81,83 .…”

Section: Discussionmentioning

confidence: 99%

Hall number, specific heat and superfluid density of overdoped high-Tc cuprates

Storey

2020

Preprint

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Despite often being dismissively described as exhibiting conventional Fermi-liquid-like behaviour, heavily overdoped high-Tc cuprates sport several unexpected features. Thermodynamic properties expected to be roughly constant with doping decrease towards zero, signalling that a growing fraction of carriers remain in the normal state below Tc. Near Tc, the superconducting energy gap fills in with temperature, contrary to the expectations of BCS theory. Most recently a transition in the Hall number of some cuprates was found to extend to a very high doping (x ≈ 0.27), far beyond the pseudogap critical point identified by a peak in thermodynamic properties (x = 0.19). This presents a challenge to the view that the pseudogap is a consequence of Fermi surface reconstruction. In this paper we present a consistent explanation for all these observations by combining pair-breaking scattering with a Fermi surface reconstruction model for the pseudogap. Notably, an increase in pair-breaking with doping leads to a separation of the points where reconstruction begins and the thermodynamic properties peak. This result highlights pair-breaking as an essential ingredient in the electronic recipe for heavily overdoped cuprate superconductors.

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Search for ferromagnetic order in overdoped copper-oxide superconductors

Cited by 11 publications

References 37 publications

Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?

Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?

Effect of on-site Coulomb repulsion on ferromagnetic fluctuations in heavily over-doped cuprates

Hall number, specific heat and superfluid density of overdoped high-Tc cuprates

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