Stand alone Cryogen free magnet used with a full suite of low temperature inserts for Graphene studies:
Dr Enrique Diez from Salamanca University, who works on Graphene, has set-up a unique and flexible cryogen-free suite of three inserts including a 4 K cryostat, 300 mK He-3 insert and a 10 mK dilution refrigerator. All inserts are interchangeable and can be fitted to their 12 T, 55 mm stand-alone Cryogen-free magnet and enables continuous measurements from 10 mK up to 40 K from one cryostat and without the need for liquid cryogen.
Dr Diez quoted: “This set-up gives us complete flexibility in the type of experiments we need to perform. We are able to make measurements from millikelvin temperatures to room temperature continuously without having to change cryostats. Apart from the convenience, it also ensures accuracy of our results. We can also use the magnet cryostat as stand-alone for quantum hall measurements at room temperature. This is particularly useful as graphene, a
new material first created in 2003 by Drs. Geim and Novoselov (Winners of the 2010 Nobel Prize in Physics) from Manchester University, exhibits Quantum Hall plateaus at room temperature.”
Apart from the obvious reduction in operating costs and preservation of helium, a scarce natural resource, dry systems are also very easy to operate, at the touch of a button.
Dr Diez has devoted the last few years to the study of magneto-transport properties of graphene. He looked closely at the temperature dependence of the plateau-plateau and plateau-insulator transition in graphene. He reported the first measurement of the scaling exponent for the plateau-insulator quantum phase transition in graphene.