Measurement principle

Pulsed Dynamic Oscillation (PDO) is a contactless radio-frequency measurement technology suitable for pulsed high magnetic fields, developed based on a proximity detector oscillator circuit (see Figure 1). During the measurement, changes in the sample's surface conductivity cause variations in the inductance of the detection coil, which in turn leads to a change in the resonance frequency of the LCR resonant circuit, allowing for detection. The measurement does not require current injection or electrodes on the sample, thus avoiding issues such as heating or contact resistance (see Figure 2). It offers significant advantages in transport studies of samples with small sizes, smooth surfaces, surface sensitivity, and temperature sensitivity.

Figure 1: Measurement circuit diagram^{[ref 1]}.

Measurement Conditions

Magnetic Field: 0-60 T

Magnet Aperture: 20 mm

Sample Temperature: 0.5-300 K

Frequency Resolution: Better than 0.3%

Figure 2: Installation sample diagram.

Typical Data

Resistivity measurements under pulsed high magnetic fields are commonly used to reveal the electronic band structure and various interactions within materials, as well as to explore novel quantum states and physical effects under extreme conditions. Contactless resistivity measurement (PDO) complements traditional electrical transport methods to meet the needs of more complex sample measurements. Figure 3 shows a contactless resistivity measurement of copper-based high-temperature superconductors. This study provides Fermi surface information for YBCO, offering experimental evidence for revealing quantum oscillations related to small Fermi pockets in copper-based superconductors, thereby supporting the identification of an isolated two-dimensional Fermi pocket.

Figure 3: User data display^{[ref 2]}

Related references

[1] Rev. Sci. Instrum. 80, 066104 (2009). M. M. Altarawneh, et al.

[2] Nat. Phys. 16, 841-847(2020). M. Hartstein, et al.

Key Contact

Xiaokang Li

Email：lixiaokang#hust.edu.cn (Please replace # with @)