Unconventional superconductivity and magnetism in CePt3Si1-xGex
Abstract
CePt3Si is a novel ternary compound exhibiting antiferromagnetic order at TN≈2.2 K and superconductivity (SC) at Tc≈0.75 K. Large values of Hc2‧≈-8.5 T/K and H(0)≈5 T indicate Cooper pairs formed out of heavy quasiparticles. The mass enhancement originates from Kondo interaction with a characteristic temperature TK≈8 K. NMR and μSR measurements evidence coexistence of SC and long-range magnetic order on a microscopic scale. Moreover, CePt3Si is the first heavy fermion SC without an inversion symmetry. This gives rise to a novel type of NMR relaxation rate 1/T1 which is very unique and never reported before for other heavy fermion superconductors. Studies of Si/Ge substitution allow us to establish a phase diagram.
- Publication:
-
Physica B Condensed Matter
- Pub Date:
- April 2005
- DOI:
- 10.1016/j.physb.2005.01.062
- arXiv:
- arXiv:cond-mat/0408244
- Bibcode:
- 2005PhyB..359..360B
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 6 pages, 9 figures, SCES'04