Point-contact spectroscopy of the heavy-fermion superconductor CePt₃Si

Abstract

Abstract. Differential resistance spectra (dV /dI − V characteristics) have been measured for point-contacts between the heavy-fermion superconductor (HFS) CePt 3 Si and a normal metal. Some contacts show a peak at V = 0 that is characteristic of HFS coexisting with a magnetic order such as UPd 2 Al 3 , UNi 2 Al 3 and URu 2 Si 2 . The evolution of the peak occurs well above the antiferromagnetic transition temperature T N ∼ 2.2 K, so that the direct relationship with the magnetic transition is questionable. The half-width of the peak seems to reflect the crystal field splitting or the spin-wave gap as observed for the above-mentioned HFSs, possibly suggesting that some common scattering process induces the zerobias peaks in these materials.

Protected boundary states in gapless topological phases

“…This in turn allows for the existence of mixed-parity superconducting states with both spin-singlet and spin-triplet pairing components. Over the past few years a number of (nodal) noncentrosymmetric superconductors have been discovered [77][78][79][80][81][82], most notably Li 2 Pt 3 B [83,84], BiPd [85,86] and the heavy-fermion compounds CePt 3 Si [87,88], CeIrSi 3 [89] and CeRhSi 3 [90]. Recently, nontrivial topology characteristics of nodal noncentrosymmetric superconductors have been studied both theoretically and experimentally [29-33, 85, 86, 91-94].…”

Andreev bound state and multiple energy gaps in the noncentrosymmetric superconductor BiPd

“…[12][13][14][15] In some systems, such as CePt 3 Si (Ref. 16) and UIr (Ref. 17), the study of parity-broken superconductivity is complicated by strong electronic correlations and by the coexistence of magnetism.…”

Development of Point-Contact Spectroscopy of Heavy-Fermion Superconductors under Pressure

“…Some of previous works of PCS were performed by a conventional method, as shown in Fig. 1(a) [2]. URu 2 Si 2 is a HFS, with the superconducting transition temperature T c ∼ 1.5 K. In addition, it shows a hidden order HO transition at T 0 ∼ 17.5 K, of which order parameter is unknown.…”