Observation of the Josephson effect in superhydrides: DC SQUID based on (La,Ce)H10+x with operating temperature of 179 K
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GRAPHICAL ABSTRACT
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PUBLIC SUMMARY
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We created SQUID (superconducting quantum interference device) with a record operating temperature of 179 K.
Sensitivity of superhydride SQUIDs can be improved to 0.01 G, and the operating temperature can reach 240 K.
More advanced applications of hydride SQUIDs can be envisioned by taking advantage of microfabrication tools.
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ABSTRACT
Among known materials, hydride superconductors have the highest critical temperatures and are very promising as a basis for electronic sensors. Superconducting quantum interference device (SQUID), due to its unique sensitivity to magnetic fields, is the most important application of superconductors in microelectronics. In this work, we describe a direct current SQUID made of lanthanum-cerium superhydride (La, Ce)H10+x (x is between ‒1 and +2) at pressure of 148 GPa, with operating temperature of 179 K and bias current of about 2 mA. When placing (La, Ce)H10+x in a modulated magnetic field (frequency: 0.1-0.005 Hz, 5 Gauss), we observed generation of higher harmonics up to 18ν0 and a periodic dependence of the sample resistance on the magnetic flux density R∝ |sin(πФ/Ф0)|. We demonstrate that the (La, Ce)H10+x SQUID with a size of ~ 4-6 μm, operates in the mode of low thermal fluctuations and can be used to detect magnetic fields below 0.1 G. Our findings pave the road to more advanced applications of the Josephson effect and SQUIDs made of hydride superconductors.-
Keywords:
- SQUID /
- superhydrides /
- quantum interference /
- magnetometer /
- superconductivity /
- Josephson effect /
- Andreev reflection
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REFERENCES
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Semenok D., Troyan I., Zhou D., et al. (2025). Observation of the Josephson effect in superhydrides: DC SQUID based on (La,Ce)H10+x with operating temperature of 179 K. The Innovation Materials 3:100115. https://doi.org/10.59717/j.xinn-mater.2024.100115
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Semenok D., Troyan I., Zhou D., et al. (2025). Observation of the Josephson effect in superhydrides: DC SQUID based on (La,Ce)H10+x with operating temperature of 179 K. The Innovation Materials 3:100115. https://doi.org/10.59717/j.xinn-mater.2024.100115
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Figure 1.
Properties of the (La, Ce)H10+x sample in the DAC H and the scheme of measurements.
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Figure 3.
The AC transport study of the (La, Ce)H10+x sample in DAC H at 148 GPa in a modulated low-frequency magnetic field. A four-electrode van der Pauw41 circuit was used
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Figure 4.
X-ray diffraction studies of polyhydrides in special DACs with a wide opening angle, synthesized via laser heating of metals and alloys with ammonia borane
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Figure 2.
The DC SQUID effect and generation of higher harmonics in the (La, Ce)H10+x sample at the pressure of 148 GPa and the temperature of 179 ± 0.5 K. The external magnetic field was generated by a sinusoidal current passing through a solenoid with a frequency of
