Superconducting dome in ionic liquid gated homoepitaxial strontium titanate thin films

Sushant Padhye; Jin Yue; Shivasheesh Varshney; Bharat Jalan; David Goldhaber-Gordon; Evgeny Mikheev

doi:10.1103/qvp7-z9vj

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Superconducting dome in ionic liquid gated homoepitaxial strontium titanate thin films

Sushant Padhye, Jin Yue, Shivasheesh Varshney, Bharat Jalan, David Goldhaber-Gordon, Evgeny Mikheev

DOI 10.1103/qvp7-z9vj · Physical Review B

T1

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Abstract

In this work, we patterned a two-dimensional electron gas (2DEG) on the surface of a SrTiO3 thin film grown homoepitaxially on SrTiO3 by hybrid molecular beam epitaxy (hMBE). We explored the superconducting dome in this material system by tuning electron density with ionic liquid gating. We found superconducting transitions up to 503 mK near an optimal electron density of approximately 3× 1013 cm−2. This is a meaningful increase from the typical optimal transition near 350 mK in similar 2DEGs on SrTiO3 single crystal substrate surfaces. Systematic tuning of 2DEG electron density revealed a consistent BCS scaling between superconducting critical temperature, coherence length, and electron mean free path. Substantial variation of transition width across the dome was described by a paraconductivity model combining Aslamazov-Larkin and Maki-Thompson contributions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.503	Pressure not reported	midpoint
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.66	Pressure not reported	unknown
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure not reported	unknown
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.62	Pressure not reported	unknown
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.37	Pressure not reported	unknown