Zero-field superconducting diode effect induced by magnetic flux in the van der Waals trigonal superconductor PtBi2
Nan Jiang, Masaki Maeda, Yuhi Yamaguchi, Mori Watanabe, Masashi Tokuda, Kensuke Takaki, Sebun Masaki, Takumi Ikushima, Takayoshi Koyanagi, Masakazu Matsubara, Kazutaka Kudo, Yasuhiro Niimi
DOI 10.1103/7knf-fm7x · Physical Review B
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Abstract
The superconducting diode effect is a nonreciprocal transport phenomenon in which the critical current depends on the current direction. This effect is typically realized in superconductors with broken spatial-inversion and time-reversal symmetry. To break the time-reversal symmetry, external magnetic fields are commonly used. Here, we demonstrate a sign-controllable superconducting diode effect under zero external magnetic field in a van der Waals superconductor, trigonal PtBi2. The sign of the zero-field superconducting diode effect is controlled by the poling magnetic field, which is a large magnetic field applied prior to measurements. This result indicates that trapped magnetic flux is responsible for breaking the time-reversal symmetry. Our findings highlight the crucial role of trapped magnetic flux in generating the superconducting diode effect and provide a general pathway for realizing a zero-field superconducting diode effect.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PtBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure not reported | onset |
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