Bulk superconducting gap of V3Si studied by low-energy ultrahigh-resolution photoemission spectroscopy

被引：1

作者：

Sato, T. ^{[1
]}

Souma, S. ^{[2
]}

Nakayama, K. ^{[1
]}

Sugawara, K. ^{[2
]}

Toyota, N. ^{[1
]}

Takahashi, T. ^{[1
,2
]}

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2016年 / 208卷

关键词：

Photoemission spectroscopy; Low-T-c superconductor; A15; compounds; SCATTERING; STATES; NB3AL; MGB2; LEAD;

D O I：

10.1016/j.elspec.2015.04.009

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

We have performed low-energy ultrahigh-resolution photoemission spectroscopy (PES) of A15 compound V3Si with a xenon-plasma discharge lamp to elucidate the bulk superconducting gap. Below the superconducting transition temperature (T-c =15.9 K), we found a sharp quasiparticle peak at the Fermi level in the PES spectrum. The gap spectrum is well fitted by a single s-wave superconducting-gap function together with a dip structure at similar to 30 meV suggestive of a strong electron-phonon coupling. The anomalous in-gap state previously observed in the PES measurement with high-energy photons is absent or negligibly small in the present bulk-sensitive measurement. The present PES result shows that V3Si is a single-gap s-wave superconductor. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：40 / 42

页数：3

共 32 条

[1] TUNNELING AND NEUTRON-SCATTERING EXPERIMENTS ON A-15 V3SI [J].