Gate tunability of the superconducting state at the EuO/KTaO3 (111) interface

Weiliang Qiao; Yang Ma; Jiaojie Yan; Wenyu Xing; Yunyan Yao; Ranran Cai; Boning Li; Richen Xiong; X. C. Xie; Xi Lin; Wei Han

doi:10.1103/PhysRevB.104.184505

Gate tunability of the superconducting state at the EuO/KTaO3 (111) interface

Weiliang Qiao, Yang Ma, Jiaojie Yan, Wenyu Xing, Yunyan Yao, Ranran Cai, Boning Li, Richen Xiong, X. C. Xie, Xi Lin, Wei Han

DOI 10.1103/PhysRevB.104.184505 · Physical Review B

T1

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Abstract

The recent discovery of superconducting interfaces in the KTaO3 (111)-based heterostructures is intriguing, since a much higher superconducting critical temperature (TC;∼2K) is achieved compared to that in the SrTiO3 heterostructures (∼300 mK). In this paper, we report the superconducting properties of the EuO/KTaO3 (111) interface as a function of the interface carrier density (ns). The maximum TC is observed to be ∼2 K at ns∼1×1014cm–2. In addition we show that the critical current density and the upper critical magnetic field can be effectively tuned by the back gate voltage. Interestingly, the gate dependence of the upper critical magnetic field exhibits a trend opposite to that of TC in the underdoped region, suggesting a relatively larger Cooper pairing potential.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.2	Pressure not reported	unknown
EuO/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure not reported	onset
EuO/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.87	Pressure not reported	zero_resistance
EuO/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.75	Pressure not reported	zero_resistance
EuO/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.33	Pressure not reported	zero_resistance
EuO/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.23	Pressure not reported	zero_resistance