Gate tunability of the superconducting state at the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>EuO</mml:mi><mml:mo>/</mml:mo><mml:mi>KTa</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> (111) interface
Weiliang Qiao, Yang Ma, Jiaojie Yan, Wenyu Xing, Yunyan Yao, Ranran Cai, Boning Li, Richen Xiong, Xiaoming Xie, Xi Lin, Wei Han
Abstract
Observation of superconductivity at the interface of EuO/KTaO${}_{3}$ (111) heterostructures came as a surprise, especially with ${T}_{c}$ being a factor of five higher compared to that in SrTiO${}_{3}$ heterostructures. Here, the authors conduct a systematic investigation of the superconducting state at the EuO/KTaO${}_{3}$ interface by varying the carrier density. Very interestingly, the gate dependence of the upper critical magnetic field exhibits a trend opposite to that of ${T}_{c}$ in the underdoped region, suggesting relatively larger Cooper pairing potential.
Topics & Concepts
SuperconductivityCondensed matter physicsHeterojunctionPairingCooper pairMagnetic fieldMaterials sciencePhysicsQuantum mechanicsElectronic and Structural Properties of OxidesMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics