Induced ferroelectricity and enhanced superconductivity through B-site doped SrTi1−xZrxO3

Stephen Zhang; Xianghan Xu; R. J. Cava

doi:10.1103/PhysRevB.111.054522

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Induced ferroelectricity and enhanced superconductivity through B-site doped SrTi1−xZrxO3

Stephen Zhang, Xianghan Xu, R. J. Cava

DOI 10.1103/PhysRevB.111.054522 · Physical Review B

T1

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Abstract

SrTiO3 is an ABO3 perovskite and nearly ferroelectric insulator that becomes one of the most dilute electron-doped superconductors known. While its superconducting mechanism is still under debate, recent studies have shown a strong connection between its incipient ferroelectricity and superconductivity. Here we induce ferroelectricity through the substitution of the perovskite B site with Zr and observe a ferroelectric transition in SrTi1−xZrxO3 for as low as x=0.01. Metallic SrTi1−xZrxO3−δ is formed through oxygen reduction, and resistive upturns indicative of the polar metal phase are observed at low temperatures. Superconductivity is enhanced up to a factor of 2 for optimal doping, and Tc enhancement decreases for higher Zr concentration. We observe a shift in the superconducting domes, as well as the formation of a superconducting dome with respect to ferroelectric substitution. These findings provide evidence in support of superconductivity driven by quantum critical fluctuations and the two-phonon pairing model in SrTiO3.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SrTiO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.33	Pressure not reported	midpoint
SrTiO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.36	Pressure not reported	midpoint
SrTiO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.29	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.539	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.577	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.611	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.61	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.622	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.558	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.448	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.55	Pressure not reported	onset
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.515	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.526	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.548	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.558	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.528	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.51	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.482	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.503	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.508	Pressure not reported	midpoint
SrTi1-xZrxO3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.48	Pressure not reported	midpoint