Introduction
Low-temperature high magnetic field electron transport and spectroscopic measurement station is an advanced experimental system by incorporating quantum transport measurements and spectroscopy measurements under extreme conditions including low temperatures and high magnetic fields, which provides a unique tool to investigate the novel properties of quantum materials, topological quantum states, and manipulations of quantum devices. The low temperature and strong magnetic field environment is provided by two sets of home-made 3He refrigerator equipped with 20 T and 9 T/3 T/1 T superconducting magnet, respectively. The station also provides a SM4000 Spectromag magneto-optical Dewar measurement unit to make quick sample screening at higher temperatures (2-300 K) and in lower magnetic fields (10 T). Spectroscopy measurement instruments include a millimeter wave network analyzer (10 MHz -100 GHz), a microwave spectrum analyzer (3 Hz -75 GHz) and a microwave signal generator (250 kHz – 67 GHz). Electrical measurement instruments include lock-in amplifiers, pre-amplifiers and low-noise source measure units. By carefully electromagnetic shielding and electrical grounding, the station has a noise level as low as 10 nV.
Parameter
| Technical data of Low temperature magneto-optical measurement unit | |
| Items | Parameters |
| Superconducting magnet | Type: split magnet Guaranteed magnetic flux density at 4.2 K: 10 Tesla Operating current at full field: < 140 A Homogeneity within10 mm diameter sphere: < 0.6% |
| Variable temperature insert | Sample space diameter: 25 mm Temperature range: 1.5-300 K |
| Cryostat | Helium can volume: 20 L Static helium reservoir evaporation rate: 185 cc/hr Nitrogen can volume: 24 L Static nitrogen reservoir evaporation rate: 392 cc/hr Optical windows: 4 quartz windows in the sample plane, two are along with magnetic field direction and the other two are perpendicular with the magnetic field direction. |
| Technical data of 9 T/3 T/1 T-22 T- 3He measurement unit | |
| Items | Parameters |
| Vertical solenoid(z axis) | Guaranteed magnetic flux density at 4.2 K: 9 Tesla Operating current at full field: < 120 A Homogeneity within10 mm diameter sphere: < 0.1% Bore size: 52 mm |
|
Horizontal split pair (x axis) |
Central field at 4.2 K: 3 Tesla Operating current at full field: < 120 A Homogeneity within10 mm diameter sphere: < 0.5% |
| Horizontal split pair (y axis) | Central field at 4.2 K: 1 Tesla Operating current at full field: < 120 A Homogeneity within10 mm diameter sphere: < 0.5% |
| Max 360° rotating field | 3 T (z-x plane); 1 T (all direction) |
| Helium can volume | 70 L |
| Static helium reservoir evaporation rate | 320 cc/hr |
| Nitrogen can volume | 66 L |
| Static nitrogen reservoir evaporation rate | 250 cc/hr |
| Technical data of 22 T- 3He measurement unit | |
| Items | Parameters |
| Guaranteed magnetic flux density | 20 T@4.2 K; 22 T@2.2 K |
| Homogeneity within 10 mm diameter sphere | 0.1% |
| Bore size | 52 mm |
| Operating current at 22 Tesla | ~180 A |
| Helium can volume | 70 L |
| Static helium reservoir evaporation rate | 220 cc/hr |
| Nitrogen can volume | 66 L |
| Static nitrogen reservoir evaporation rate | 250 cc/hr |
Characteristic
The low-frequency electrical measurement interface of this experimental station is provided according to the following two standards:
1. 16 Pin standard IC measurement holder. Silver glue or bonded leads can be used.
2. 24 Pin customized measurement header. Silver adhesive or bonded leads can be used.
Glove Box Interconnect Sensitive Sample Preparation System
The Glovebox Interconnection Sensitive Sample Preparation System can realize the full flow preparation of low-dimensional sensitive materials to meet the whole process of transferring and coating without water-oxygen contamination for van der Waals composite devices and corner electronics devices, so that the samples can show very excellent properties, such as high mobility, good ohmic contact, etc., and provide more favorable experimental platforms for the further study of low-dimensional topology quantum matter states. The system can provide means of sample cleaning, transferring, vaporizing, leading and probing.
Contact
Peiling Li, E-mail: cioran@iphy.ac.cn
