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Magnetism and superconductivity

Accès rapides

Accès rapides

Prochain Séminaire de la FIP :
Accéder au programme

Retrouvez toutes les informations pour vos stages :
Stages L3
Stages M1 ICFP

Actualités : Séminaire de Recherche ICFP
du 14 au 18 novembre 2022 :

Retrouvez le programme complet

Contact - Secrétariat de l’enseignement :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr

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Physique Quantique

Faculty : Alain SACUTO

Tutor : Yann GALLAIS

ECTS credits : 6

Language of instruction : English
Web site : www.mpq.univ-paris-diderot.fr/spip.php ?rubrique260

Module description

This course is an introduction to magnetism and superconductivity. It starts with the basic macroscopic and microscopic theories of both phenomena which are then illustrates them with topics of current research in the respective fields such as quantum magnetism or high temperature superconductivity. 6 lectures will be devoted for each subject. They will be accompanied with homework and problem solving sessions.

Outline

Part 1 : Magnetism

A) Non-interacting magnetism

  • Currents and spins
  • Isolated atom magnetism
  • Local spin paramagnetism
  • Intinerant spin Pauli paramagnetism

B) Interacting magnetism

  • Exchange interaction
  • Heisenberg Hamiltonian and mean field theory of ferromagnetism
  • Anisotropy and crystal field effects
  • Low dimensional magnetism
  • Stoner theory of itinerant magnetism

C) Heisenberg model and excitations

  • Heisenberg ferromagnetism
  • Spin waves in ferromagnets and antiferromagnets
  • Spin dynamics and resonances

D) Introduction to quantum magnetism

  • Ground state of the Heisenberg model : dimensionality and frustration effects
  • Valence bond and spin liquid states
  • Recent theoretical and experimental developments quantum magnetism

Part 2 : Superconductivity

A) A history of superconductivity : 1911-2011

B) Selected experiments on conventional and high-temperature superconductors (transport, reflectivity, inelastic light scattering, neutron scattering, tunneling, angle resolved photoemission spectroscopy).

C) Phenomenological approach

  • Superfluid density, coherent length, penetration depth
  • Two kinds of Superconductors
  • Josephson effect, Shapiro’s steps

D) The BCS theory

  • Instability of the normal state in the presence of an attractive interaction
  • (Cooper pairs)
  • Ground state and elementary excitations (superconducting gap, condensation
  • energy, Bogoliubov excitations, density of states).
  • Temperature dependence of the superconducting gap and critical temperature.

E) Conventional superconductors versus high-Tc superconductors

  • Electron-phonon and electron- electron coupling
  • Gap symmetry
  • Transport (thermal conductivity, heat capacity, resistivity)
  • Optics (Raman, IR, ARPES)

Accès rapides

Prochain Séminaire de la FIP :
Accéder au programme

Retrouvez toutes les informations pour vos stages :
Stages L3
Stages M1 ICFP

Actualités : Séminaire de Recherche ICFP
du 14 au 18 novembre 2022 :

Retrouvez le programme complet

Contact - Secrétariat de l’enseignement :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr

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