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Sujet de stage / Master 2 Internship

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Magnetic phase diagrams of Ising hyperkagome networks in rare-earth garnets

Contact: Damay Françoise, , francoise.damay@cea.fr, +33 1 69 08 49 54 / 62 29
Summary:
We plan to determine the (H,T) magnetic phase diagram at low temperature and determine the nature of the field induced phases in Dy3Ga5O12 and compare it with textbook Dy3Al5O12.
Possibility of continuation in PhD: Oui
Deadline for application:29/04/2022

Full description:
The study of quantum phase transitions has been a major focus of theoretical and experimental work in condensed matter. The Ising model in transverse field is a well-known example of such quantum transitions, with, at the critical point, a qualitative change in the nature of the quantum wavefunction of the ground state. Nice experimental realizations can be found in magnetic materials, where the spins are characterized by a strong easy-axis anisotropy. This is the case in aluminum garnets such as Dy3Al5O12, the Ising character arising from the rare-earth strong anisotropy. Strikingly, in this material, the easy-axis direction is not a global one, but differs on symmetrically equivalent sites. Such a compound can thus serve as a model systems to better understand magnetic field induced transitions. Here we wish to investigate another dysprosium garnet, Dy3Ga5O12, whose originality relies on the fact that magnetic anisotropy departs from the strong Ising picture and becomes planar. We plan to determine the (H,T) magnetic phase diagram at low temperature and determine the nature of the field induced phases. This work will include neutron diffraction data analysis and magnetic phase diagram calculations.
Technics/methods used during the internship:
The work will be performed at the LLB laboratory. Neutron diffraction in field data is already available, simulations will be performed with an in-house software.

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