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Master 2 : Magnetism and superconductivity under extreme conditions

Detailed subject:

The Laboratoire National des Champs Magnétiques Intenses is today on the world podium of non-destructive pulsed magnetic fields, with a record of 90 T. These extreme fields allow tuning the fundamental properties of numerous materials, as quantum magnets presenting a non-conventional superconducting phase in the vicinity of a quantum magnetic phase transition.

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Figure : 3D phase diagram of the heavy-fermion system CeRh2Si2 , which has been recently investigated at the LNCMI (AF = antiferromagnetism, PM = paramagnetism, CPM = correlated paramagnetism, PPM = polarized paramagnetism)

Among them, we can cite heavy-fermion systems, where the effective electron mass is typically 100 to 1000 times the free electron mass – due to strong electronic interactions -, but also new iron-based superconductors, where the effective mass is smaller but the superconducting temperature is higher.

In this internship, magnetoresistivity measurements will allow characterizing the magnetic phase diagram of materials whose ground state is paramagnetic, antiferromagnetic, and/or superconducting, and determining their Fermi surface, which is the signature of their conduction electrons.

Publications linked to the theme:

  1. "Dichotomy between the hole and electrons behavior in the multiband FeSe probed by ultra high magnetic fields”, M.D. Watson et al., Phys. Rev. Lett. 115, 027006 (2015).
  2. “Heavy fermions in a high magnetic field”, D. Aoki, W. Knafo, and I. Sheikin, C. R. Physique 14, 53 (2013).
  3. “Fermi surface in the hidden‐order state of URu2Si2 under intense pulsed magnetic fields up to 81 T”, G.W. Scheerer et al., Phys. Rev. B 89, 165107 (2014).

PhD thesis: This Master internship could be extended into a PhD within the same research subject. During the PhD, measurements will be extended to high pressure (new setup unique in the world) and to high magnetic fields higher than 90 T (and maybe above 100 T…)

Background and skills expected:

Solid State Physics, Magnetism, Superconductivity, Experimental skills, Matlab and/or Python etc.

Supervisor :

William Knafo

Tel : +33 5 62 17 29 74

E‐mail: william.knafo@lncmi.cnrs.fr