High-temperature field-free superconducting diode effect in high-Tc cuprates

Shichao Qi, Jun Ge, Chengcheng Ji, Yiwen Ai, Gaoxing Ma, Ziqiao Wang, Zihan Cui, Yi Liu, Ziqiang Wang and Jian Wang ()
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Shichao Qi: Peking University
Jun Ge: Peking University
Chengcheng Ji: Peking University
Yiwen Ai: Peking University
Gaoxing Ma: Peking University
Ziqiao Wang: Peking University
Zihan Cui: Renmin University of China
Yi Liu: Renmin University of China
Ziqiang Wang: Boston College
Jian Wang: Peking University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract The superconducting diode effect (SDE) is defined by the difference in the magnitude of critical currents applied in opposite directions. It has been observed in various superconducting systems and attracted high research interests. However, the operating temperature of the SDE is typically low and/or the sample structure is rather complex. For the potential applications in non-dissipative electronics, efficient superconducting diodes working in zero magnetic field with high operating temperatures and a simple configuration are highly desired. Here, we report the observation of a SDE under zero magnetic field with operating temperatures up to 72 K and efficiency as high as 22% at 53 K in high-transition-temperature (high-Tc) cuprate superconductor Bi2Sr2CaCu2O8+δ (BSCCO) flake devices. The rectification effect persists beyond two hundred sweeping cycles, confirming the stability of the superconducting diode. Our results offer promising developments for potential applications in non-dissipative electronics, and provide insights into the mechanism of field-free SDE and symmetry breakings in high-Tc superconductors.

Date: 2025
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DOI: 10.1038/s41467-025-55880-4

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