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Hidden and conspicuous magnetic order in hyper-kagome magnets

  • Full or part time
  • Application Deadline
    Applications accepted all year round
  • Funded PhD Project (European/UK Students Only)
    Funded PhD Project (European/UK Students Only)

Project Description

The main goal of the project is to experimentally study highly unusual magnetic properties of several gadolinium-containing garnets, primarily Gd3Ga5O12 (GGG), Gd3Al5O12 and Gd3Te2Li3O12. Although the compounds have been known for decades, it has only recently been realized that the particular way in which the Gd ions form a crystal structure, described as a hyper-kagome lattice, is crucial in order to understand their magnetic behaviour. The structure consists of corner-sharing triangles with the Gd ions forming 10-site loops. In GGG, the loops are responsible for a hidden order in a spin-liquid phase in zero field, as identified by the powder neutron diffraction analysis [1]. They are also responsible for the appearance of the flat modes in the excitation spectrum in higher magnetic fields [2].

This project will address all important and yet completely open questions: What it the nature of field-induced ordering in the garnets? What interactions are responsible for the selection of a particular magnetic state among many other possibilities? Can the signatures of the multi-spin correlations be found in other compounds? We will use neutron scattering as a main tool in our investigations, in particular on single crystal garnet samples.

Funding Notes

A full 3.5 year studentship for UK students (fees and maintenance) is available. The project may also be available for outstanding EU students. Candidates should hold or expect to hold a high 2.1 or 1st in Physics or related subject area. See View Website for further details. Applications can be made at go.warwick.ac.uk/PGapply

References

[1] J.A.M. Paddison, H. Jacobsen, O.A. Petrenko, M.T. Fernandez-Diaz, P.P. Deen and A.L. Goodwin, Science 350, 179 (2015).

[2] N. d'Ambrumenil, O.A. Petrenko, H. Mutka and P.P. Deen, Phys. Rev. Letters 114, 227203 (2015).

How good is research at University of Warwick in Physics?

FTE Category A staff submitted: 54.60

Research output data provided by the Research Excellence Framework (REF)

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