Fermi surface topology of Ca1.5Sr0.5RuO4 determined by angle-resolved photoelectron spectroscopy

We report angle-resolved photoelectron spectroscopy results of the Fermi surface of Ca1.5Sr0.5RuO4, which is at the boundary of magnetic/orbital instability in the phase diagram of the Ca-substituted Sr ruthenates. Three t(2g) energy bands and the corresponding Fermi surface sheets are observed, whi...

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Veröffentlicht in:Physical review letters 2004-10, Vol.93 (17), p.177007.1-177007.4
Hauptverfasser: WANG, S.-C, YANG, H.-B, MANDRUS, D, PLUMMER, E. W, WANG, Z, DING, H, SEKHARAN, A. K. P, SOUMA, S, MATSUI, H, SATO, T, TAKAHASHI, T, CHENXI LU, JIANDI ZHANG, JIN, R
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Sprache:eng
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Zusammenfassung:We report angle-resolved photoelectron spectroscopy results of the Fermi surface of Ca1.5Sr0.5RuO4, which is at the boundary of magnetic/orbital instability in the phase diagram of the Ca-substituted Sr ruthenates. Three t(2g) energy bands and the corresponding Fermi surface sheets are observed, which are also present in the Ca-free Sr2RuO4. We find that while the Fermi surface topology of the alpha,beta (d(yz,zx)) sheets remains almost the same in these two materials, the gamma (d(xy)) sheet exhibits a holelike Fermi surface in Ca1.5Sr0.5RuO4 in contrast to being electronlike in Sr2RuO4. Our observation of all three volume conserving Fermi surface sheets clearly demonstrates the absence of orbital-selective Mott transition, which was proposed theoretically to explain the unusual transport and magnetic properties in Ca1.5Sr0.5RuO4.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.93.177007