Orbital-dependent electron correlation in LiFeAs revealed by angle-resolved photoemission spectroscopy

T. Hajiri, T. Ito, M. Matsunami, B. H. Min, Y. S. Kwon, K. Kuroki, and S. Kimura

Phys. Rev. B 93, 024503 – Published 6 January 2016

Abstract

We report on the electronic structure of the 111-type iron pnictide superconductor LiFeAs as a function of temperature using angle-resolved photoemission spectroscopy. Below approximately 50 K, both the $d_{y z}$ hole band at the $Z$ point and the $d_{x z / y z}$ electron band at the $A$ point shift to a higher binding energy side. However, at the high-symmetry points $Z, A, Γ$ , and $M$ , the remaining bands are almost independent of temperature. One of the possible scenarios for these observations is that a strong, three-dimensional orbital-dependent correlation exists in the normal state of LiFeAs in relation to short-range spin fluctuations.

Received 12 February 2015
Revised 4 September 2015

DOI:https://doi.org/10.1103/PhysRevB.93.024503

Authors & Affiliations

T. Hajiri^1,2,*, T. Ito^1,3, M. Matsunami^2,4,†, B. H. Min⁵, Y. S. Kwon^5,6, K. Kuroki⁷, and S. Kimura^2,7,8

¹Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
²UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
³Nagoya University Synchrotron Radiation Research Center, Nagoya University, Nagoya 464-8603, Japan
⁴School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Okazaki 444-8585, Japan
⁵DGIST-LBNL Joint Research Center, DGIST, Daegu 711-873, Republic of Korea
⁶Department of Emerging Materials Science, DGIST, Daegu 711-873, Republic of Korea
⁷Department of Physics, Graduate School of Science, Osaka University, Osaka 565-0043, Japan
⁸Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan

^*Present address: Department of Crystalline Materials science, Nagoya University, Nagoya 464-8603, Japan; t.hajiri@numse.nagoya-u.ac.jp
^†Present address: Toyota Technological Institute, Nagoya 468-8511, Japan.

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Vol. 93, Iss. 2 — 1 January 2016

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