Superconductivity and Magnetism

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Laboratory Measurements

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Our laboratories here at Warwick are well equipped for the study of superconducting and magnetic materials.

Magnetic Measurements

We have established a Centre for Magnetic Measurements based in the laboratories of the Superconductivity and Magnetism Group here in Physics Department at the University of Warwick. The magnetometers and susceptometers described below are used to make measurements on a wide range of magnetic materials.

Research scientists from many different disciplines including Physics, Biology, Chemistry and Materials Science have already taken advantage of these facilities. Some of the users are from Departments here at Warwick, while others are based at other UK HEI's or research centres.

If you think that studies of the magnetic properties of your samples may be of help in your work, please contact us to discuss the possibility of collaborating.

Oxford Instruments Vibrating Sample Magnetometer

	We have an Oxford Instruments vibrating sample magnetometer (VSM) with a 12 tesla superconducting solenoid. The VSM can operate between 1.5 and 300 K using a standard Variable Temperature Insert (VTI) and from 50 to 1000 K using a specially constructed furnace insert. This system also has an insert for making ac susceptibility measurements in large dc magnetic fields
Oxford Instruments MagLab VSM with 12T magnet and 1.4-350K VTI. The photgraph shows the cryostat on the left mounted inside it's vibration isolation frame.To the right of the picture is the instrument rack.

Quantum Design MPMS-5S SQUID Magnetometer

Our 5T Quantum Design MPMS-5S SQUID magnetometer is used to make high sensitivity magnetisation measurements in the temperature range 1.8 to 400 K. This instrument has a resolution of 5*10^-8 emu. The system has the continuous low temperature, reciprocating sample and temperature sweep options.

We have an easyLab Mcell 10 high-pressure cell for carrying out dc magnetisation measurements under pressures of up to 1GPa in our SQUID magnetometer. The single walled hydrostatic cell has a pressure volume of 1.9 mm diameter by 10 mm length. The pressure is monitored in-situ using a Sn manometer.

SQUID

Quantum Design MPMS-5S SQUID magnetometer with 5T magnet,RSO and continuous low temperature option.

AC Susceptibility

We have built an ac magnetic susceptometer to perform low field ac susceptibility measurements at temperatures between 1.5-320K in the frequency range 20 Hz to 10000Hz and where H_ac < 100 Oe.

Thermodynamic Measurements

Quantum Design Physical Properties Measurement System (PPMS)

PPMS

We have a Quantum Design Physical Properties Measurement System (PPMS) with a P650 heat capacity option. Measurements of heat capacity can be made between 0.4K and 350 K in magnetic fields of up to 9T. Samples with masses of between 5 and 500 mg can be measured with a resolutiuon of 10nJ/K @ 2.0K. The system uses a 2 tau heat pulse-relaxtion technique.

The QD PPMS measurement system consisting of dewar with superconducting magnetic and associated control electronics.

For more infomation on the PPMS heat capacity system click here to view a PDF file of the Quantum Design Application Note

Transport Measurements

We have a number of cryostats suitable for carrying out transport measurements.

Oxford Instruments 9T Cryomagnet

	A 9 T Oxford Instruments superconducting magnet with insert and instrumentation is available to carry out magneto-resistance and Hall effect measurements from 300 mK to 300 K
Oxford Instruments 9T magnet used to make transport measurements in magnetic field.

We also have a number of cryostats which allow us to perform resistivity and thermopower studies in the temperature range 1.5-320 K
	One of our "Orange" cryostats. This is used to make thermopower measurements between 2 K and room temperature.

Linde Kryotechnic TCF10 Helium Liqufier

The Physics Department has its own Linde TCF10 helium liquefier. This system is manged by the Superconductivity and Magnetism Group and provides liquid helium to all the research groups in the Department who use low temperature equipment.

The TCF10 is a fully automatic computer controlled helium liquefier using turboexpanders and a screw commpressor (Kaeser CSD82). The system includes an oil removal skid, built in drier and low loss purifier, and a pure gas buffer. In normal operation, the cold box can produce 11 litres of liquid per hour that is stored in a 1000 litre vessel for distribution in mobile dewars to our research laboratories.

Recovery systems on each cryostat collect the helium gas which is stored in a 10m³ balloon before being compressed into bundles of high pressure (300 bar) storage bottles by a recovery compressor (Bauer Verticus 5).