Josephson Effect between Noncentrosymmetric LaPt₃Si and a Conventional Superconductor

Crystal structure, magnetic properties and bonding analysis of M3Pt23Ge11 (M=Ca, Sr, Ba and Eu)

“…The lowtemperature noncentrosymmetric heavy fermion superconductor, CePt3Si, has been reported, for example, to antiferromagnetically order below its superconducting transition temperature Tc ~ 0.75 K. 10 Two other noncentrosymmetric Pt-rich superconductors, Li2Pt3B and LaPt3Si, have also been reported. 11,12 And a Pt-rich heavy-fermion superconductor, UPt3, has been reported to display two distinct superconducting phases below 1 K, and an antiferromagnetic ordering transition temperature TN ~ 5.8 K. 13,14 To broaden the investigation of Pt-based intermetallics, here we report the synthesis, structural characterization and magnetic properties of M3Pt23Ge11 (M = Ca, Sr, Ba and Eu), previously unreported phases that are isostructural with RE3Pt23Si11 (RE = rare-earth) phases. 15 Magnetic susceptibility measurements show no evidence for superconductivity above 1.8 K. Ferromagnetic ordering is observed at around 3 K for Eu3Pt23Ge11, however.…”

Discovery of the Pt-Based Superconductor LaPt5As

“…In particular, the unconventional mechanism behind the Cooper pairing and the coexistence of superconductivity and magnetism have been widely discussed. For instance, the compounds with a heavy Fermion state (UPt 3 ), non-centrosymmetric superconductors (CePt 3 Si, BaPtSi 3 , Li 2 Pt 3 B, and LaPt 3 Si), a series of borocarbides R Pt 2 B 2 C ( R = Y, La, Pr, Nd, Th), − the recently discovered A Pt 3 P ( A = La, Ca, Sr), and the quaternary Ca-Pt-Fe-As system − with a high superconducting transition temperature ( T c = 38 K) are under intense investigation. Yet, face-centered-cubic (fcc) Pt metal itself has not shown superconductivity, even at the lowest accessible temperature ( T = 1.5 μK), , despite the fact that it has a high electronic specific-heat coefficient and a strong electron–phonon coupling, which are favorable conditions for superconductivity.…”

Josephson Effect of Heavy-Fermion Superconductors Measured in a 3-Axes Magnetometer

“…8) In this paper we have fabricated a 3-axes magnetometer to reduce the residual magnetic field along three directions and investigated the * E-mail address: sumiyama@sci.u-hyogo.ac.jp …”