金属酸化物の構造変化が超伝導特性に与える影響を解明(Study uncovers how structural changes affect the superconducting properties of a metal oxide)

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超伝導のさらなる研究と、より効率の高い半導体の創製に道を拓く研究成果 Research opens the door for further study of superconductivity and the creation of more efficient semiconductors

2022-06-01 ミネソタ大学

ミネソタ大学ツインシティーズ校の研究者が率いるチームは、金属酸化物半導体であるチタン酸ストロンチウムの微妙な構造変化が、材料の電気抵抗を変化させ、超電導特性に影響を与えることを発見しました。
この研究は、超伝導に関する今後の実験や材料設計の指針になるとともに、さまざまな電子機器に応用できるより効率的な半導体の創製につながるものです。
この研究は、米国科学振興協会が発行する「Science Advances」に掲載されています。

<関連情報>

高移動度超伝導体SrTiO3薄膜における異常輸送の解明 Anomalous transport in high-mobility superconducting SrTiO3 thin films

JIN YUE,YILIKAL AYINO,TRISTAN K. TRUTTMANN,MARIA N. GASTIASORO,EYLON PERSKY,ALEX KHANUKOV,DOOYONG LEE ,LAXMAN R. THOUTAM,BEENA KALISKY,RAFAEL M. FERNANDES ,VLAD S. PRIBIAG AND BHARAT JALAN
Science Advances  Published;25 May 2022
DOI: 10.1126/sciadv.abl5668

Abstract

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.

 

 

Science Advances

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