High-sensitivity superconducting magnetic detection device and method based on NV color center under high pressure and low temperature

By integrating microwave emission, optical excitation, and fluorescence collection modules, combined with cryogenic semi-steel cables and in-situ pressure plates, the integration problem of high-voltage superconducting detection systems with cryogenic conditions was solved, achieving high-precision superconducting transition measurement and a simple pressure calibration method.

CN120870983APending Publication Date: 2025-10-31HEFEI INSTITUTE OF PHYSICAL SCIENCE CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202511041934.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-28
Publication Date
2025-10-31

AI Technical Summary

Technical Problem

The NV color center system for high-pressure superconducting detection is difficult to directly connect with cryogenic conditions. Existing devices suffer significant microwave losses at low temperatures, and ordinary cryogenic cavities cannot be directly pressurized, making integration inconvenient.

Method used

Design a high-sensitivity superconducting magnetic detection device based on NV color centers under high pressure and low temperature, including microwave emission, optical excitation, imaging, fluorescence collection, data collection and control, diamond anvil cell and low temperature testing module. Microwave signal transmission and low temperature pressurization are achieved by using low temperature semi-steel cable and in-situ pressure plate, and the optical detection magnetic resonance spectrum is integrated for pressure standardization.

Benefits of technology

It achieves high-precision superconducting transition measurement at low temperatures, obtains more accurate optically detected magnetic resonance spectrum signals, supports arbitrary pressure loading and unloading at any temperature, simplifies the experimental process, and improves the integration and measurement accuracy of the device.

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Abstract

The invention provides a high-sensitivity superconducting magnetic detection device and method based on an NV color center under high pressure and low temperature. The high-sensitivity superconducting magnetic detection device comprises a microwave emission module, an optical excitation module, an imaging module, a fluorescence collection module, a data collection and control module, a diamond anvil cell, a low-temperature test module and a magnet module. The method has the beneficial effects that the diamond injected with the NV color center serves as the anvil cell of the diamond anvil cell, and high-pressure and low-temperature conditions are synchronously obtained in liquid helium and liquid nitrogen temperature zones; according to the invention, in-situ pressure measurement can be realized under high pressure, and ruby or Raman standard pressure is not needed; a sample is placed in the diamond anvil cell, the diamond anvil cell is placed in the low-temperature cavity, the lowest temperature of 4K and in-situ pressurization can be realized by using the low-temperature test module, and the quality of a microwave signal transmitted by the low-temperature semi-steel cable is higher and the loss is smaller by using the low-temperature semi-steel cable. And the superconducting property of the material at low temperature and high pressure is quantitatively tested under the condition of high integration.
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