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| Naji, M. |
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| Azevedo, Nuno Monteiro |
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Hameed, Sajna
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article
Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate
Abstract
<p>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 (T<sub>c</sub>) of undeformed SrTiO<sub>3</sub>, with evidence of possible superconducting correlations at temperatures two orders of magnitude above the bulk T<sub>c</sub>. 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 T<sub>c</sub>, 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.</p>