Polar Nanodomains in a Ferroelectric Superconductor

Salmani-Rezaie, Salva; Ahadi, Kaveh; Stemmer, Susanne

doi:10.1021/acs.nanolett.0c02285

Title: Polar Nanodomains in a Ferroelectric Superconductor

Journal Article · Thu Aug 06 00:00:00 EDT 2020 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.0c02285· OSTI ID:1646483

Salmani-Rezaie, Salva ^[1]; Ahadi, Kaveh ^[1];

^[1]

Univ. of California, Santa Barbara, CA (United States)

The mechanisms by which itinerant carriers compete with polar crystal distortions is a key unresolved issue for polar superconductors, which offer new routes to unconventional Cooper pairing. Strained, doped SrTiO₃ films undergo successive ferroelectric and superconducting transitions, making them ideal candidates to elucidate the nature of this competition. Here, we reveal these interactions using scanning transmission electron microscopy studies of the evolution of polar nanodomains as a function of doping. These nanodomains are a precursor to the ferroelectric phase and a measure of long-range Coulomb interactions. With increasing doping, the magnitude of the polar displacements, the nanodomain size, and the Curie temperature are systematically suppressed. In addition, we show that disorder caused by the dopant atoms themselves presents a second contribution to the destabilization of the ferroelectric state. Furthermore, the results provide evidence for two distinct mechanisms that suppress the polar transition with doping in a ferroelectric superconductor.

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Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO)

Grant/Contract Number:: FG02-02ER45994; W911NF-16-1-0361

OSTI ID:: 1646483

Journal Information:: Nano Letters, Vol. 20, Issue 9; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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