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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; Löhneysen, Hilbert; Fernandes, Rafael M.; Shibauchi, Takasada

Abstract (englisch):
Electronic nematicity, a correlated state that spontaneously breaks rotational symmetry, is observed in several layered quantum materials. 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 Ba1−xRbxFe2As2 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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DOI: 10.1073/pnas.1909172117
Zitationen: 3
Web of Science
Zitationen: 4
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Institut für Theoretische Festkörperphysik (TFP)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2020
Sprache Englisch
Identifikator ISSN: 0027-8424, 1091-6490
KITopen-ID: 1000118122
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Proceedings of the National Academy of Sciences of the United States of America
Verlag National Academy of Sciences
Band 117
Heft 12
Seiten 6424–6429
Vorab online veröffentlicht am 12.03.2020
Nachgewiesen in Scopus
Web of Science
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