On the important role of the anti-Jahn-Teller effect in underdoped cuprate superconductors

Hiroshi Kamimura, Shunichi Matsuno, Takashi Mizokawa, Kenji Sasaoka, Kenji Shiraishi, Hideki Ushio

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

In this paper it is shown that the «anti-Jahn-Teller effect» plays an essential role in giving rise to a small Fermi surface of Fermi pockets above Tc and d-wave superconductivity below Tc in underdoped cuprates. In the first part of the present paper, we review the latest developments of the model proposed by Kamimura and Suwa, which bears important characteristics born from the interplay of Jahn-Teller Physics and Mott Physics. It is shown that the feature of Fermi surfaces in underdoped LSCO is the Fermi pockets in the nodal region constructed by doped holes under the coexistence of a metallic state and of the local antiferromagnetic order. In the antinodal region in the momentum space, there are no Fermi surfaces. Then it is discussed that the phonon-involved mechanism based on the Kamimura-Suwa model leads to the d-wave superconductivity. In particular, it is shown that the origin of strong electron-phonon interactions in cuprates is due to the anti-Jahn-Teller effect. In the second part a recent theoretical result on the energy distribution curves (EDCs) of angle-resolved photoemission spectroscopy (ARPES) below Tc is discussed. It is shown that the feature of ARPES profiles of underdoped cuprates consists of a coherent peak in the nodal region and the real transitions of photoexcited electrons from occupied states below the Fermi level to a free-electron state above the vacuum level in the antinodal region, where the latter transitions form a broad hump. From this feature, the origin of the two distinct gaps observed by ARPES is elucidated without introducing the concept of the pseudogap. Finally, a remark is made on the phase diagram of underdoped cuprates.

Original languageEnglish
Article number012043
JournalJournal of Physics: Conference Series
Volume428
Issue number1
DOIs
Publication statusPublished - 2013 Jan 1
Externally publishedYes
Event21st International Symposium on the Jahn-Teller Effect 2012 - Tsukuba, Japan
Duration: 2012 Aug 262012 Aug 31

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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