University of Birmingham > Talks@bham > Condensed Matter Physics Seminars > Magnetism, Superconductivity and Quantum Order

Magnetism, Superconductivity and Quantum Order

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  • UserDr. Emma Pugh, University of Kent
  • ClockFriday 18 November 2016, 14:00-15:00
  • HousePhysics East 217.

If you have a question about this talk, please contact Elizabeth Blackburn.

In some strongly interacting electron systems if the conditions are correct, new ordered states are formed which cannot be explained by the traditional low temperature theories of matter. A rich discovery arena for such new ordered states has been in systems which are on the border of long range magnetic order. The method of “quantum tuning” can allow a control parameter, such as pressure, to cleanly and precisely “push” materials in to new states of matter which cannot be readily observed at ambient conditions. The aim of this study is to investigate the inter-relationship between structure, magnetic and electronic properties when the magnetic ordering temperature is suppressed to a quantum critical point by the application of pressure. We have performed low temperature, high pressure, powder synchrotron x-ray diffraction experiments to investigate the subtle changes in structure that occur. Resistivity and AC-susceptibility techniques sensitively probe the magnetic, superconducting and novel quantum states of interest and give us valuable information on the underlying interactions. Results from a number of materials will be presented including the ferromagnet ZrZn2 around the magnetic quantum critical point. Measurements down to low temperatures of 15 mK and high pressures up to 20 GPa in a diamond anvil cell are presented. The results are discussed in relation to the properties of the material.

This talk is part of the Condensed Matter Physics Seminars series.

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