Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

Hameed, Sajna; Pelc, Damjan; Anderson, Zachary W.; Klein, Avraham; Spieker, Richard; Li, Yuelin; Das, Bhaskar; Ramberger, Justin; Lukas, Marin; Liu, Yaohua; Krogstad, Matthew J.; Osborn, Raymond; Li, Yuan; Leighton, Chris; Fernandes, Rafael M.; Greven, Martin

doi:10.1038/s41563-021-01102-3

Title: Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

Journal Article · Mon Oct 04 00:00:00 UTC 2021 · Nature Materials

DOI: https://doi.org/10.1038/s41563-021-01102-3 · OSTI ID:1824978

Hameed, Sajna ^[1]; Pelc, Damjan ^[2];

^[1];

^[3]; Spieker, Richard ^[1]; Li, Yuelin ^[4]; Das, Bhaskar ^[1]; Ramberger, Justin ^[1]; Lukas, Marin ^[5];

^[6];

^[7];

^[8];

^[1]; Fernandes, Rafael M. ^[1];

^[1]

Univ. of Minnesota, Minneapolis, MN (United States)
Univ. of Minnesota, Minneapolis, MN (United States); Univ. of Zagreb (Croatia)
Univ. of Minnesota, Minneapolis, MN (United States); Ariel Univ. (Israel)
Argonne National Laboratory (ANL), Advanced Photon Source (APS)
Univ. of Zagreb (Croatia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Peking Univ., Beijing (China)

The properties of quantum materials are commonly tuned using experimental variables such as pressure, magnetic field and doping. Here we explore a different approach using irreversible, plastic deformation of single crystals. We show that compressive plastic deformation induces low-dimensional superconductivity well above the superconducting transition temperature (Tc) of undeformed SrTiO3, with evidence of possible superconducting correlations at temperatures two orders of magnitude above the bulk Tc. The enhanced superconductivity is correlated with the appearance of self-organized dislocation structures, as revealed by diffuse neutron and X-ray scattering. We also observe deformation-induced signatures of quantum-critical ferroelectric fluctuations and inhomogeneous ferroelectric order using Raman scattering. Our results suggest that strain surrounding the self-organized dislocation structures induces local ferroelectricity and quantum-critical dynamics that strongly influence Tc, consistent with a theory of superconductivity enhanced by soft polar fluctuations. Our results demonstrate the potential of plastic deformation and dislocation engineering for the manipulation of electronic properties of quantum materials.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: Croatian Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science - Office of Basic Energy Sciences

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725; SC0016371

OSTI ID:: 1824978

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 1 Vol. 21; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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