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The mechanism of increasing the superconducting transition temperature of niobium-titanium alloy under ultra-high pressure

The mechanism of increasing the superconducting transition temperature of niobium-titanium alloy (NbTi) under ultra-high pressure is mainly related to the following aspects:

1. Stability of crystal structure
Under ultra-high pressure conditions, the crystal structure of niobium-titanium alloy remains relatively stable, although its volume is compressed by about 43%. Studies have shown that there is no change in the crystal structure under a pressure of 200 GPa, which means that niobium-titanium alloy can withstand large deformations and maintain its superconductivity.

2. Enhanced electron interaction
Under high pressure, the interaction between electrons may be enhanced, thereby increasing the superconducting transition temperature. This enhanced interaction can promote the formation of electron pairs (Cooper pairs), thereby improving superconductivity. As transition metals, niobium and titanium have stronger coupling effects in their electronic structures under high pressure, which helps to increase the superconducting transition temperature.

3. Relationship with high-entropy alloys
The study of niobium-titanium alloys also provides a new perspective for understanding high-entropy alloy superconductors composed of multiple transition metals. By studying the superconductivity of niobium-titanium alloys under extreme conditions, scientists can gain a deeper understanding of the microscopic basis of the superconducting mechanism in high-entropy alloys, which may provide theoretical support for further optimizing the performance of niobium-titanium alloys.

4. Comparison with other superconducting materials
Compared with copper oxide and iron-based superconductors, niobium-titanium alloys show stronger superconducting stability under high pressure. These materials are usually very sensitive to volume changes, while niobium-titanium alloys show relatively good tolerance, which allows it to maintain good superconducting properties under extreme environments.

In summary, the increase in the superconducting transition temperature of niobium-titanium alloys under ultra-high pressure is the result of multiple factors such as crystal structure stability, enhanced electronic interactions, and comparison with other material properties.