TY - JOUR
T1 - Anomalous transport in high-mobility superconducting SrTiO3 thin films
AU - Yue, Jin
AU - Ayino, Yilikal
AU - Truttmann, Tristan K.
AU - Gastiasoro, Maria N.
AU - Persky, Eylon
AU - Khanukov, Alex
AU - Lee, Dooyong
AU - Thoutam, Laxman R.
AU - Kalisky, Beena
AU - Fernandes, Rafael M.
AU - Pribiag, Vlad S.
AU - Jalan, Bharat
N1 - Publisher Copyright:
© 2022 The Authors.
PY - 2022/5
Y1 - 2022/5
N2 - The study of subtle effects on transport in semiconductors requires high-quality epitaxial structures with low defect density. Using hybrid molecular beam epitaxy (MBE), SrTiO3 films with a low-temperature mobility exceeding 42,000 cm2 V-1 s-1 at a low carrier density of 3 × 1017 cm-3 were achieved. A sudden and sharp decrease in residual resistivity accompanied by an enhancement in the superconducting transition temperature were observed across the second Lifshitz transition where the third band becomes occupied, revealing dominant intraband scattering. These films further revealed an anomalous behavior in the Hall carrier density as a consequence of the antiferrodistortive (AFD) transition and the temperature dependence of the Hall scattering factor. Using hybrid MBE growth, phenomenological modeling, temperature-dependent transport measurements, and scanning superconducting quantum interference device imaging, we provide critical insights into the important role of inter- versus intraband scattering and of AFD domain walls on normal-state and superconducting properties of SrTiO3.
AB - The study of subtle effects on transport in semiconductors requires high-quality epitaxial structures with low defect density. Using hybrid molecular beam epitaxy (MBE), SrTiO3 films with a low-temperature mobility exceeding 42,000 cm2 V-1 s-1 at a low carrier density of 3 × 1017 cm-3 were achieved. A sudden and sharp decrease in residual resistivity accompanied by an enhancement in the superconducting transition temperature were observed across the second Lifshitz transition where the third band becomes occupied, revealing dominant intraband scattering. These films further revealed an anomalous behavior in the Hall carrier density as a consequence of the antiferrodistortive (AFD) transition and the temperature dependence of the Hall scattering factor. Using hybrid MBE growth, phenomenological modeling, temperature-dependent transport measurements, and scanning superconducting quantum interference device imaging, we provide critical insights into the important role of inter- versus intraband scattering and of AFD domain walls on normal-state and superconducting properties of SrTiO3.
UR - http://www.scopus.com/inward/record.url?scp=85130836443&partnerID=8YFLogxK
U2 - 10.1126/sciadv.abl5668
DO - 10.1126/sciadv.abl5668
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C2 - 35613270
AN - SCOPUS:85130836443
SN - 2375-2548
VL - 8
JO - Science advances
JF - Science advances
IS - 21
M1 - abl5668
ER -