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Quantum magnetism in intense magnetic field

The subject proposed here consists in the experimental study of heavy‐ fermion quantum magnets under intense magnetic fields.

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Figure: 3D phase diagram of heavy‐fermion systems (p = pressure, H = magnetic field, T = temperature, AF = antiferromagnetism, SC = superconductivity, PM = paramagnetism, etc.)

Detailed subject The LNCMI in Toulouse is today on the world podium of non‐destructive pulsed magnetic fields, with a record of 99 T and the objective to go beyond 100 T in 2019. These extremely high magnetic fields allow changing continuously the basic properties of quantum magnets, where a non‐conventional superconducting phase develops in the vicinity of a quantum magnetic phase transition. In the so‐called heavy‐fermion systems, the electrons have effective masses of 100 to 1000 times the free electron mass ‐ due to strong electronic interactions, also responsible for superconductivity.

In this Master 2 internship, heavy‐fermion magnets will be investigated by electrical resistivity under combined extreme conditions of high pressures and intense magnetic fields. The objective will be to determine the 3D phase diagram of a magnetic and superconducting material. During this project, the student will work in a team, within a collaboration between the LNCMI Toulouse and the CEA Grenoble.

Publications linked to the theme 1. “Three‐dimensional critical phase diagram of the Ising antiferromagnet CeRh2Si2 under intense magnetic field and pressure“, W. Knafo et al., Phys. Rev. B 95, 014411 (2017). 2. “Field‐induced spin‐density wave beyond hidden order in URu2Si2“, W. Knafo et al., Nature Commun. 7, 13075 (2016

This Master internship could be extended into a PhD, where the studies started here will be continued using a large panel of high‐field experiments (neutron diffraction, magnetization, magnetocaloric effect) in addition to the electrical resistivity under pressure. This year, the LNCMI‐Toulouse will probably benefit from a ‘bourse ministérielle’ PhD grant, to which it will be possible to postulate.

Background and skills expected Background: Solid state physics, Magnetism, Superconductivity, The candidate will be motivated to perform fine experiments on complex and fascinating physical systems.

Supervisor : William Knafo Contacts ‐ Tel : +33 5 62 17 29 74 E‐mail: william.knafo@lncmi.cnrs.fr