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Title: Quantum Ferroelectric Instabilities in Superconducting SrTiO 3

Abstract

We examine the effects of strain and cation substitution on the superconducting phase of polar semiconductors near a ferroelectric quantum phase transition with a model that combines a strong coupling theory of superconductors with a standard microscopic framework for displacive polar modes coupled to strain degrees of freedom. Our calculations reveal that the superconducting transition temperature T-c is enhanced by proximity to the ferroelectric instability from the disordered side, while it is generally suppressed in the ordered phase due to its increase in dielectric stiffness and a reduction of critical fluctuations from dipolar induced anisotropies. The condensation of the pairing phonon excitations generates a kink in T-c at a charge density that is generally lower than that of the quantum critical point (QCP) and where both superconducting and ferroelectric orders set in. We apply our model to SrTiO 3 and find that the antiadiabatic limit places the kink nearly at its QCP. As the QCP is pushed to higher charge densities with either tuning parameter, we find that the dome narrows and sharpens. Our model is in qualitative and fair quantitative agreement with the recent observation of overlapping ferroelectric-like and superconducting instabilities in n-doped Sr 1-xCa xTiO 3 and strainmore » tuning of T-c in n-doped SrTiO 3. We compare our results to previous models invoking order-disorder lattice dynamics to describe the pairing excitations.« less

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1490097
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 10; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Arce-Gamboa, J. R., and Guzmán-Verri, G. G. Quantum Ferroelectric Instabilities in Superconducting SrTiO3. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.104804.
Arce-Gamboa, J. R., & Guzmán-Verri, G. G. Quantum Ferroelectric Instabilities in Superconducting SrTiO3. United States. doi:10.1103/PhysRevMaterials.2.104804.
Arce-Gamboa, J. R., and Guzmán-Verri, G. G. Mon . "Quantum Ferroelectric Instabilities in Superconducting SrTiO3". United States. doi:10.1103/PhysRevMaterials.2.104804.
@article{osti_1490097,
title = {Quantum Ferroelectric Instabilities in Superconducting SrTiO3},
author = {Arce-Gamboa, J. R. and Guzmán-Verri, G. G.},
abstractNote = {We examine the effects of strain and cation substitution on the superconducting phase of polar semiconductors near a ferroelectric quantum phase transition with a model that combines a strong coupling theory of superconductors with a standard microscopic framework for displacive polar modes coupled to strain degrees of freedom. Our calculations reveal that the superconducting transition temperature T-c is enhanced by proximity to the ferroelectric instability from the disordered side, while it is generally suppressed in the ordered phase due to its increase in dielectric stiffness and a reduction of critical fluctuations from dipolar induced anisotropies. The condensation of the pairing phonon excitations generates a kink in T-c at a charge density that is generally lower than that of the quantum critical point (QCP) and where both superconducting and ferroelectric orders set in. We apply our model to SrTiO3 and find that the antiadiabatic limit places the kink nearly at its QCP. As the QCP is pushed to higher charge densities with either tuning parameter, we find that the dome narrows and sharpens. Our model is in qualitative and fair quantitative agreement with the recent observation of overlapping ferroelectric-like and superconducting instabilities in n-doped Sr1-xCaxTiO3 and strain tuning of T-c in n-doped SrTiO3. We compare our results to previous models invoking order-disorder lattice dynamics to describe the pairing excitations.},
doi = {10.1103/PhysRevMaterials.2.104804},
journal = {Physical Review Materials},
issn = {2475-9953},
number = 10,
volume = 2,
place = {United States},
year = {2018},
month = {10}
}

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