PhD project: Listening to quantum criticality, charge density waves and unconventional supercondcutivity

Project description

Ultra-sound is a powerful directional probe for understanding magnetic phase transitions and exploring non-conventional superconductivity. The project will develop and use this technique to gain insight into the mechanism responsible for unconventional superconductivity in ferromagnetic superconductors and superconductors hosting charge density waves. Ultrasound is well suited for use in piston cylinder pressure cells, needed to tune materials to the conditions where non-conventional superconductivity and other states emerge.  

For example, UGe is both ferromagnetic and superconducting, a state requiring parallel spins to be paired. It undergoes a mysterious change in moment at the pressure superconductivity is strongest, with a strong signature in the ultrasound. A similar jump in magnetisation linked to field induced superconductivity occurs in another ferromagnetic superconductor URhGe (

The project will apply ultrasound to explore the transitions and the resulting superconductivity in these materials and those hosting both superconductivity and charge density waves.  Advances in the technique are made possible by new very high frequency electronics. 

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