Zero-field and field-symmetric anomalous transverse resistance in LaAlO3/KTaO3(111) interfacial superconductors
Wenze Pan, Yishuai Wang, Jirong Sun, Yanwu Xie
DOI 10.1103/1848-9r5d · Physical Review Materials
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Abstract
We present a systematic investigation of the Hall effect and transverse-resistive behavior in superconducting LaAlO3/KTaO3(111) interfaces. Upon cooling Hall-bar-shaped samples in zero magnetic field, we observe a sharp anomalous transverse-resistance peak emerging in the superconducting transition region. When sweeping magnetic field along the out-of-plane direction at temperatures below the superconducting transition, we detect remarkable anomalous transverse-resistance peaks exhibiting even symmetry with respect to the field—a striking deviation from the conventional odd-symmetric Hall resistance. With decreasing temperature, these anomalous features shift to higher fields while their magnitude increases rapidly. Our analysis attributes both unusual transverse-resistance phenomena to subtle resistive inhomogeneities arising from uneven distribution of vortices (antivortices) at the interfaces. These findings not only elucidate the unique vortex dynamics in KTaO3-based interfacial superconductors but also demonstrate how transverse-resistance measurements can serve as a sensitive probe for investigating inhomogeneous superconducting states in two-dimensional systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaAlO3/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | midpoint |
| LaAlO3/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure not reported | zero_resistance |
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