Anomalous superconducting-gap symmetry of noncentrosymmetric La2C3 observed by ultrahigh-resolution photoemission spectroscopy

K. Sugawara; T. Sato; S. Souma; T. Takahashi; A. Ochiai

doi:10.1103/PhysRevB.76.132512

← Back to search

Anomalous superconducting-gap symmetry of noncentrosymmetric La2C3 observed by ultrahigh-resolution photoemission spectroscopy

K. Sugawara, T. Sato, S. Souma, T. Takahashi, A. Ochiai

DOI 10.1103/PhysRevB.76.132512 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We have performed ultrahigh-resolution photoemission spectroscopy on noncentrosymmetric superconductor La2C3 to study the electronic structure near the Fermi level (EF) and the superconducting-gap symmetry. We clearly observed the opening of the superconducting gap, as evidenced by the emergence of a sharp quasiparticle peak just below EF together with the leading-edge shift toward higher binding energy. Quantitative analysis of the gap function has revealed a marked deviation from the single s- or d-wave symmetry, suggesting the existence of multiple superconducting gaps.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.5	Pressure not reported	unknown
La2C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.5	Pressure not reported	onset
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2Pd3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y2C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.7	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown