Dr. Marie-Aude Méasson Laboratoire Matériaux et Phénomènes Quantiques - CNRS, Université Paris Diderot

Jeudi 3 Juin à 16 h 00 Amphi Holweck, Esc. C, 1er étage

Superconductivity in Non-Centrosymmetric Compounds :
Effect on the upper critical field Hc2 of CeCoGe3

Superconductivity in crystal with non-centrosymmetric structure has recently attracted much
attention notably in heavy fermion compounds, like CePt3Si[1]. The absence of inversion symmetry
along with antisymmetric spin-orbit coupling allows a new kind of superconducting order parameter,
with an admixture of spin-singlet and spin-triplet components [2]. Unconventional properties are
expected, including unusual upper critical field with a helical-vortex state and an anisotropic Pauli
limitation.
I will summarize the theoretical studies on superconductivity in non centrosymmetric
compounds with Rashba type spin-orbit coupling. Then we will focus on experimental results on
CeCoGe3, a non centrosymmetric superconductor. We have studied the upper critical field of
CeCoGe3 and its anisotropy under high pressure. Hc2 is very anisotropic with a huge value for H along
the c axis (dHc2/dT=-45T/K), the highest ever reported if normalized to the superconducting
temperature of 0.65K. A comparison with CePt3Si and other compounds of the same family CeIrSi3
and CeRhSi3 will be done.
[1] E. Bauer et al., Phys. Rev.Lett. 92 (2004) 027003.
[2] Y. Yanase et al., J. Phys. Soc. of Jpn 76 (2007) 124709.
[3] Kimura et al., Phys. Rev. Lett. 98 (2007) 197001.
[4] R. Settai et al., J. Phys. Soc. of Jpn 77 (2008) 073705.


Haut de page



À lire aussi...

B J Hickey, University of Leeds

Jeudi 10 Avril 2014, 14hAmphi Holweck, Esc C, 1ème etage Spin-Orbit Effects in Electron Transport B J HickeyE C Stoner Lab, Department of Physics (…) 

> Lire la suite...

Matthieu Delbecq, Center for Emergent Matter Science RIKEN

Jeudi 26 Novembre 2015 14h Amphi Holweck, Esc C, 1ème etage Multiple spin qubits in semiconductor quantum dots subject to nuclear spin bath (…) 

> Lire la suite...