Evidence for excluding the possibility of $d$-wave superconducting-gap symmetry in Ba-doped KFe${}_{2}$As${}_{2}$

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Evidence for excluding the possibility of $d$ -wave superconducting-gap symmetry in Ba-doped KFe $_{2}$ As $_{2}$

Y. Ota, K. Okazaki, Y. Kotani, T. Shimojima, W. Malaeb, S. Watanabe, C.-T. Chen, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, T. Saito, H. Fukazawa, Y. Kohori, and S. Shin

Phys. Rev. B 89, 081103(R) – Published 4 February 2014

Abstract

We have investigated the superconducting (SC)-gap anisotropy for several Ba-doped KFe $_{2}$ As $_{2}$ samples using laser-based angle-resolved photoemission spectroscopy. We show that the SC-gap anisotropy and node positions drastically change with a small amount of Ba doping. Our results totally exclude a possibility of $d$ -wave symmetry and strongly suggest that both spin and orbital fluctuations are important for the pairing interaction in the Ba-doped K122.

Received 26 July 2013
Revised 14 January 2014

DOI:https://doi.org/10.1103/PhysRevB.89.081103

Authors & Affiliations

Y. Ota¹, K. Okazaki^1,*, Y. Kotani^1,†, T. Shimojima^1,‡, W. Malaeb¹, S. Watanabe², C.-T. Chen³, K. Kihou⁴, C. H. Lee⁴, A. Iyo⁴, H. Eisaki⁴, T. Saito⁵, H. Fukazawa⁵, Y. Kohori⁵, and S. Shin^1,6,7

¹Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
²Research Institute for Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
³Beijing Center for Crystal R&D, Chinese Academy of Science (CAS), Zhongguancun, Beijing 100190, China
⁴National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
⁵Department of Physics, Chiba University, Chiba 263-8522, Japan
⁶CREST, JST, Chiyoda-ku, Tokyo 102-0075, Japan
⁷RIKEN SPring-8 Center, Sayo-gun, Hyogo 679-5148, Japan

^*Present address: Department of Physics, University of Tokyo, Tokyo 113-0033, Japan.
^†Present address: Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Sayo, Hyogo 679-5198, Japan.
^‡Present address: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

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Issue

Vol. 89, Iss. 8 — 15 February 2014

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