High-
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 superconducting dome in artificial heterostructures made of nanoscale quantum building blocks

Valletta, Antonio; Bianconi, Antonio; Perali, Andrea; Logvenov, Gennady; Campi, Gaetano

doi:10.1103/physrevb.110.184510

Phys. Rev. B

2024

DOI: 10.1103/physrevb.110.184510

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High- Tc superconducting dome in artificial heterostructures made of nanoscale quantum building blocks

Antonio Valletta,

Antonio Bianconi,

Andrea Perali

et al.

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2024

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Cited by 1 publication

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Kondo Versus Fano in Superconducting Artificial High-Tc Heterostructures

Campi,

Logvenov,

Caprara

et al. 2024

Condensed Matter

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Recently, the quest for high-Tc superconductors has evolved from the trial-and-error methodology to the growth of nanostructured artificial high-Tc superlattices (AHTSs) with tailor-made superconducting functional properties by quantum design. Here, we report the growth by molecular beam epitaxy (MBE) of a superlattice of Mott insulator metal interfaces (MIMIs) made of nanoscale superconducting layers of quantum confined-space charge in the Mott insulator La2CuO4 (LCO), with thickness L intercalated by normal metal La1.55Sr0.45CuO4 (LSCO) with period d. The critical temperature shows the superconducting dome with Tc as a function of the geometrical parameter L/d showing the maximum at the magic ratio L/d = 2/3 where the Fano–Feshbach resonance enhances the superconducting critical temperature. The normal state transport data of the samples at the top of the superconducting dome exhibit Planckian T-linear resistivity. For L/d > 2/3 and L/d < 2/3, the heterostructures show a resistance following Kondo universal scaling predicted by the numerical renormalization group theory for MIMI nanoscale heterostructures. We show that the Kondo temperature, TK, and the Kondo scattering amplitude, R0K, vanish at L/d = 2/3, while TK and R0K increase at both sides of the superconducting dome, indicating that the T-linear resistance regime competes with the Kondo proximity effect in the normal phase of MIMIs.

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Kondo Versus Fano in Superconducting Artificial High-Tc Heterostructures

Campi,

Logvenov,

Caprara

et al. 2024

Condensed Matter

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show abstract

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High- Tc superconducting dome in artificial heterostructures made of nanoscale quantum building blocks

Cited by 1 publication

References 90 publications

Kondo Versus Fano in Superconducting Artificial High-Tc Heterostructures

Kondo Versus Fano in Superconducting Artificial High-Tc Heterostructures

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