Strong-coupling superconductivity in noncentrosymmetric superconductor Li 2Pd 3B by sub-mev photoemission spectroscopy

Shunsuke Tsuda, Takayoshi Yokoya, Takayuki Kiss, Takahiro Shimojima, Kyoko Ishizaka, Shik Shin, Tadashi Togashi, Shuntaro Watanabe, Zhang Chengqian, Chen Chuangtian, Izumi Hase, Hiroyuki Takeya, Kazuto Hirata, Kazumasa Togano

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Noncentrosymmetric superconductors Li 2Pd 3B and Li 2Pt 3B are studied by high-resolution photoemission spectroscopy. The valence band spectra of Li 2Pd 3B and Li 2Pt 3B are well explained by firstprinciples band calculations. The sub-meV photoemission result shows that the size of the superconducting gap of Li 2Pd 3B is about 1.1 meV at 5.4K with a reduced gap value (2Δ0=ξ BT c) of about 4.5, which is greater than the Bardeen-Cooper-Schrieffer (BCS) value of 3.52. The obtained superconducting gap can be explained more clearly with an s-wave superconducting gap than with p- and d-wave superconducting gaps. This result indicates that Li 2Pd 3B is a conventional strong-coupling superconductor.

Original languageEnglish
Article number034711
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - Mar 2009


  • High-resolution photoemission spectroscopy
  • Noncentrosymmetric superconductor
  • Strong-coupling
  • Superconducting gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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