Laboratory instrumentation
Our group was formed only a few years ago with empty lab space, but we now have good access to equipment for basic experimental research at low temparatures and high magnetic fields thanks to funding from the Knut and Alice Wallenberg foundation and start-up funds from Stockholm University.
Cryostats
Our work-horse is a
17 T cryogen-free system
17 T cryostat
based on closed-cycle refrigeration. It is able to operate in the temperature range of 1.6 K
to 300 K. The cryostat has a probe for 360 degree sample rotation and an
ac-susceptibility
AC susceptibility probe
probe. We also have a closed-cycle 3He insert for
temperatures down to 300 mK (290 mK base temperature, sample in vacuum).
For low-temperature, low-field meassurements we have a cryogen-free
3He cryostat with optical access
3He cryostat with optical access
reaching 5 T.
A third cryostat for testing and zero-field measurements, we have a
home-built
Home-built cryostat
cryogen-free cryostat reaching about 12 K.
General instrumentation
Our general instrumentation include:
-
LS340 temperature controllers
LakeShore 340 temperature controller
(2)
-
LS332 temperature controller
LakeShore 332 temperature controller
-
KE6221/2182A ac + dc precision current source and nano-voltmeter
KE6221/2182A ac + dc precision current source and nano-voltmeter
(2)
-
SR830 lock-in amplifiers
Stanford SR830 lock-in amplifier
(2)
-
Cryogenics MPS
Cryogenics Magnet Power Supply
(Magnet power supply)
-
SR560 Preamplifier
SR560 Preamplifier
-
DS345 Frequency generator
DS345 Frequency generator
-
TTi frequency generator
TTi frequency generator
-
TTi DC power supply
TTi DC power supply
-
KE2700 multimeter & scanner
Keithley 2700 multimeter & scanner
-
Digital oscilloscope
Digital oscilloscope
-
Turbo pump
Turbo pump
-
PCI-6251, PCI-6259 M-series DAQ card
PCI-6251, PCI-6259 M-series DAQ card connector
from National Instruments (1 each)
- Home-built preamplifiers
-
Tunable THz source with chopper
Tunable THz source
-
THz detector
THz detector
-
THz lenses and polarization filters
THz lens and polarization filter
PXI system
For control and measurements, we have a state-of-the-art, real-time
PXI system
PXI system
from National Instruments for high-speed and high-resolution data
acquisition. This versatile system will enable unique electric, thermal,
calorimetric, and magnetic measurements. In particular, the system
includes:
- PXI-8196: embedded real-time controller
- PXI-5422: 200 MS/s, 16 bit waveform generator, up to 2 GHz random interleaved
- PXI-4461: 24 bit, 204.8 kS/s analog inputs (2), analog outputs (2)
- PXI-4462: 24 bit, 204.8 kS/s analog inputs (4)
- PXI-5922: 24 bit flex, 500 kS/s to 15 MS/s analog input
- PXI-5122: 100 MS/s, 14 bit analog inputs (2), 256 Mb/ch
- PXI-7831R: FPGA (1MGates, 40 MHz base clock), integrated with digital i/o (24 ch), 200 kS/s, analog inputs (8 ch, 200 kS/s, 16 bit), analog outputs (8 ch, 500 kS/s, 16 bit)
- PXI-6251: M-series, 16 bit, 1.5 MS/s, digital i/o (24 ch), analog inputs (8), analog outputs (2)
Measurement software
The instrumentation is integrated by means of a LabVIEW-based measurement program for automated measurements. The system currently supports:
- VISA, GPIB, and serial communication with connected instruments
- Waveform generation, sampling & analysis
- Communication with the PXI system cards
- Communication with front panel of the FPGA
- Remote access of the 17 T magnet computer controller
Nanofabrication
For sample fabrication, the Nano-Fab Lab at AlbaNova enables fabrication of advanced devices and samples. Equipment here include, among other things, a focused ion beam, sputtering equipment, SEM and e-beam writer, mask aligner, AFM, reactive ion etcher, microscopes, surface profilometer, and resist facilities in clean-room environment. Our group (through external and internal financing) has contributed to the following equipment:
