Pre-formed Cooper pairs in copper oxides and LaAlO3—SrTiO3 heterostructures

Božović, Ivan; Levy, Jeremy

doi:10.1038/s41567-020-0915-8

Title: Pre-formed Cooper pairs in copper oxides and LaAlO₃—SrTiO₃ heterostructures

Journal Article · Tue Jul 07 00:00:00 EDT 2020 · Nature Physics

DOI:https://doi.org/10.1038/s41567-020-0915-8· OSTI ID:1631027

^[1];

^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)
Univ. of Pittsburgh, PA (United States); Pittsburgh Quantum Inst., PA (United States)

The Bardeen–Cooper–Schrieffer theory of superconductivity and the Landau–Fermi liquid theory form the basis of our current understanding of conventional superconductors and their parent non-superconducting phases. However, some exotic superconductors do not conform to this physical picture but instead feature an unusual ‘normal’ state that is not a Fermi liquid. One explanation of this unusual behaviour is that pre-formed pairs of electrons are established above the superconducting temperature T_c. Here, we highlight recent experiments that show the likely existence of these pre-formed pairs in two rather different materials—a high-temperature cuprate superconductor and strontium titanate. Moreover, in both materials the normal state from which superconductivity emerges has other shared properties, including a pseudogap and electronic nematicity—rotational symmetry breaking in the electron fluid that is not expected in Fermi liquid theory nor more generally from the crystal lattice symmetry. These experimental findings should provoke more interaction between the communities working on these materials and new insights into the underlying mechanism of the creation of pre-formed pairs.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF)

Grant/Contract Number:: SC0012704; GBMF4410; N00014-15-1-2847; PHY-1913034

OSTI ID:: 1631027

Report Number(s):: BNL-215951-2020-JAAM; TRN: US2200728

Journal Information:: Nature Physics, Vol. 16, Issue 7; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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