Superconductivity and normal state properties of non-centrosymmetric CePt₃Si: a status report

• Published in: Физика низких температур
• Date: 2005
• Main Authors: Bauer, E., Bonalde, I., Sigrist, M.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2005
• Subjects: К семидесятилетию антиферромагнетизма
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/121693
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Superconductivity and normal state properties of non-centrosymmetric CePt₃Si: a status report / E. Bauer, I. Bonalde, M. Sigrist // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 984-994. — Бібліогр.: 39 назв. — англ.

Ternary CePt₃Si crystallizes in the tetragonal P4mm structure which lacks a center of inversion. Antiferromagnetic order sets in at TN≈22 . K followed by superconductivity (SC) below Tc≈ 0.75 K. Large values of H'c2≈-8.5 T/K and Hc2(0)≈5T were derived, referring to Cooper pairs formed out of heavy quasiparticles. The mass enhancement originates from Kondo interactions with a characteristic temperature TK≈ 8 K. CePt₃Si follows the general features of correlated electron systems and can be arranged within the Kadowaki–Woods plot next to the unconventional SC UPt₃. NMR and mSR results show that both magnetic order and SC coexist on a microscopic scale without having spatial segregation of both phenomena. The absence of an inversion symmetry gives rise to a lifting of the degeneracy of electronic bands by spin-orbit coupling. As a consequence, the SC order parameter may have uncommon features as indicated from a very unique NMR relaxation rate 1/T₁ and a linear temperature dependence of the penetration depth λ.