Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Magnetic Materials
MA 13.10: Vortrag
Montag, 26. März 2012, 17:30–17:45, H 0112
The Hourglass and Charge-Stripe Order of La(5/3)Sr(1/3)CoO(4). — •Paul Freeman1,2, Sean Giblin3, Prabhakaran Dharmalingam4, Peter Babkevich4,5, Eugen Weschke1, Enirco Schierle1, and Andrew Boothroyd4 — 1Helmholtz-Zentrum Berlin, Berlin, Germany. — 2Institut Laue-Langevin, Grenoble, France. — 3ISIS Facility, RAL, Didcot, U.K. — 4Oxford University, Oxford, U. K.. — 5Laboratory for Neutron Scattering, Paul Scherrer Institut, Villigen, Switzerland.
The universal hourglass magnetic excitation spectrum in hole doped cuprates has reopened the debate on the importance of charge stripe order and cuprate superconductivity[1]. While the incommensurate ordered phase of the cuprates strongly resemblances that of charge ordered La(2-x)Sr(x)NiO(4+delta)[2], the magnetic excitation spectrum does not[1,3]. We however observe that the magnetic excitation spectrum of charge stripe ordered La(5/3)Sr(1/3)CoO(4) has an hourglass dispersion that can be understood within a charge stripe model[2,4].
In this contribution we present our combined neutron scattering, μSR and resonant soft x-ray diffraction studies of charge stripe ordered La(5/3)Sr(1/3)CoO(4). Studying the magnetism on different length and timescales, while providing the first direct evidence of charge-stripe ordering in La(2-x)Sr(x)CoO(4).
[1] S. M. Hayden, et. al. , Nature 429, 531 (2004); J. M. Tranquada, , et. al., Nature 429, 534 (2004). [2] J. M. Tranquada et al. Nature 375, 561 (1995). [3] H. Woo et. al. Phys. Rev. B 72, 064437 (2005). [4] A. T. Boothroyd, et. al., Nature 471, 341 (2011).