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Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides

Drees, Y.; Li, Z. W.; Ricci, A.; Rotter, M.; Schmidt, W.; Lamago, D.; Sobolev, O.; Rütt, U.; Gutowski, O.; Sprung, M.; Piovano, A.; Castellan, J. P.; Komarek, A. C.

The magnetic excitations in the cuprate superconductors might be essential for an understanding of high-temperature superconductivity. In these cuprate superconductors the magnetic excitation spectrum resembles an hour-glass and certain resonant magnetic excitations within are believed to be connected to the pairing mechanism, which is corroborated by the observation of a universal linear scaling of superconducting gap and magnetic resonance energy. So far, charge stripes are widely believed to be involved in the physics of hour-glass spectra. Here we study an isostructural cobaltate that also exhibits an hour-glass magnetic spectrum. Instead of the expected charge stripe order we observe nano phase separation and unravel a microscopically split origin of hour-glass spectra on the nano scale pointing to a connection between the magnetic resonance peak and the spin gap originating in islands of the antiferromagnetic parent insulator. Our findings open new ways to theories of magnetic excitations and superconductivity in cuprate superconductors.

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Verlagsausgabe §
DOI: 10.5445/IR/1000085920
Veröffentlicht am 20.09.2018
DOI: 10.1038/ncomms6731
Web of Science
Zitationen: 26
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000085920
HGF-Programm 43.21.01 (POF II, LK 01)
Erschienen in Nature Communications
Band 5
Heft 1
Seiten Article: 5731
Vorab online veröffentlicht am 23.12.2014
Nachgewiesen in Web of Science
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