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How is the increase in the superconducting transition temperature of niobium-titanium alloy under ultra-high pressure experimentally verified?

The increase in the superconducting transition temperature of niobium-titanium alloy under ultra-high pressure was verified through a series of experiments, mainly including the following aspects:

1. High-pressure experiment
The research team used a high-pressure device to apply extremely high pressure to niobium-titanium alloy, up to 261.7 GPa. Under this pressure, the superconducting transition temperature of niobium-titanium alloy increased from 9.6K under normal pressure to 19.1K. This experimental result shows that under ultra-high pressure conditions, niobium-titanium alloy can still maintain zero-resistance superconductivity, showing its superior pressure resistance characteristics.

2. Critical magnetic field measurement
Under the pressure of 211 GPa and the low temperature of 1.8K, the study also measured the critical magnetic field of niobium-titanium alloy and found that it increased from 15.4T to 19T. This result further supports the enhancement of the superconducting properties of niobium-titanium alloy under high-pressure conditions.

3. Synchrotron radiation high-pressure XRD experiment
High-pressure X-ray diffraction (XRD) experiments conducted by Shanghai Light Source synchrotron radiation showed that under a pressure of 200 GPa, the crystal structure of niobium-titanium alloy did not change, but its volume was compressed by about 43%. This result shows that despite the volume change, niobium-titanium alloy can still maintain its superconducting properties, which is in sharp contrast to the sensitivity of other types of superconducting materials to volume changes.

4. Comprehensive experimental techniques
The study combined a variety of experimental techniques such as high-pressure extreme conditions, strong magnetic fields and synchrotron radiation to provide a new understanding of the behavior of niobium-titanium superconductivity in extreme environments. This multidisciplinary approach lays the foundation for further exploration of the performance of superconducting materials under extreme conditions.

In summary, through the above-mentioned various experimental methods, the researchers effectively verified the significant increase in the superconducting transition temperature of niobium-titanium alloy under ultra-high pressure and its physical mechanism.