Skip to Main content Skip to Navigation
Theses

Etude du composé ferromagnétique supraconducteur URhGe

Frédéric Hardy 1
1 LCP - Laboratoire de Cryophysique
SPSMS - UMR 9001 - Service de Physique Statistique, Magnétisme et Supraconductivité : DSM/DRFMC/SPSMS
Abstract : This thesis deals with the physical properties of the ferromagnetic superconductor URhGe. It is the first study realized on single crystals in extreme experimental conditions i.e. very low temperature, high hydrostatic pressure and intense magnetic field. First of all we describe the crystal growth and the different annealing procedures necessary to obtain samples that exhibit a complete and narrow resistive superconducting transition. Then we present the pressure-temperature phase diagram obtained by calorimetry, resistivity and magnetisation. On contrary to UGe2 the Curie temperature (TCurie) increases linearly up to 130 kbar while the ordered moment and the superconducting critical temperature (Tc) decrease monotonically. We also report the influence of the lattice defects and the first try of measuring the critical current. Our results are compatible with an unconventional superconducting ground state. Finally we present the first measurements of the upper critical field (Hc2) on samples with different RRR. A clear jump of Hc2 close to Tc illustrates the presence of the ferromagnetic domains in the superconducting condensate. The value of Hc2 at 0 K and the observed strong anisotropy are coherent with a polar order parameter with spin triplet pairing.
Complete list of metadatas

Cited literature [76 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00008410
Contributor : Frédéric Hardy <>
Submitted on : Tuesday, February 8, 2005 - 9:27:47 PM
Last modification on : Wednesday, November 4, 2020 - 2:45:06 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:57:49 PM

Identifiers

  • HAL Id : tel-00008410, version 1

Collections

Citation

Frédéric Hardy. Etude du composé ferromagnétique supraconducteur URhGe. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2004. Français. ⟨tel-00008410⟩

Share

Metrics

Record views

346

Files downloads

833