Novel electronic nematicity in heavily hole-doped iron pnictide superconductors

Ishida, Kousuke; Tsujii, Masaya; Hosoi, Suguru; Mizukami, Yuta; Ishida, Shigeyuki; Iyo, Akira; Eisaki, Hiroshi; Wolf, Thomas; Grube, Kai; v. Löhneysen, Hilbert; Fernandes, Rafael M.; Shibauchi, Takasada

doi:10.1073/pnas.1909172117

Title: Novel electronic nematicity in heavily hole-doped iron pnictide superconductors

Journal Article · Thu Mar 12 00:00:00 EDT 2020 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1909172117· OSTI ID:1604261

Ishida, Kousuke ^[1]; Tsujii, Masaya ^[1]; Hosoi, Suguru ^[1]; Mizukami, Yuta ^[1]; Ishida, Shigeyuki ^[2]; Iyo, Akira ^[2]; Eisaki, Hiroshi ^[2]; Wolf, Thomas ^[3]; Grube, Kai ^[3]; v. Löhneysen, Hilbert ^[4]; Fernandes, Rafael M. ^[5];

^[1]

Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan,
Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan,
Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany,
Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany,, Physikalisches Institut, Karlsruher Institut für Technologie, 76031 Karlsruhe, Germany,
School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455

Electronic nematicity, a correlated state that spontaneously breaks rotational symmetry, is observed in several layered quantum materials. Here, in contrast to their liquid-crystal counterparts, the nematic director cannot usually point in an arbitrary direction (XY nematics), but is locked by the crystal to discrete directions (Ising nematics), resulting in strongly anisotropic fluctuations above the transition. Here, we report on the observation of nearly isotropic XY-nematic fluctuations, via elastoresistance measurements, in hole-doped Ba_1–xRb_xFe₂As₂ iron-based superconductors. While for x = 0, the nematic director points along the in-plane diagonals of the tetragonal lattice, for x = 1, it points along the horizontal and vertical axes. Remarkably, for intermediate doping, the susceptibilities of these two symmetry-irreducible nematic channels display comparable Curie–Weiss behavior, thus revealing a nearly XY-nematic state. This opens a route to assess this elusive electronic quantum liquid-crystalline state.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012336; SC0020045

OSTI ID:: 1604261

Alternate ID(s):: OSTI ID: 1773899

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 117 Journal Issue: 12; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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