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    4 results 1
    Université de Fribourg

    Evidence of a Precursor Superconducting Phase at Temperatures as High as 180 K in RBa₂Cu₃O7-δ (R=Y,Gd,Eu) Superconducting Crystals from Infrared Spectroscopy

    Dubroka, Adam ; Rössle, Matthias ; Kim, Kyung Wan ; Malik, Vivek Kumar ; Munzar, Dominik ; Basov, D. N. ; Schafgans, A. A. ; Moon, S. J. ; Lin, C. T. ; Haug, D. ; Hinkov, V. ; Keimer, B. ; Wolf, Th. ; Storey, J. G. ; Tallon, Jeffery L. ; Bernhard, Christian

    In: Physical Review Letters, 2011, vol. 106, no. 4, p. 047006

    We show that a multilayer analysis of the infrared c-axis response of RBa₂Cu₃O7-δ (R=Y,Gd,Eu) provides important new information about the anomalous normal-state properties of underdoped cuprate high temperature superconductors. In addition to competing correlations which give rise to a pseudogap that depletes the low-energy electronic states below...

    Université de Fribourg

    Incommensurate magnetic order and dynamics induced by spinless impurities in YBa₂Cu₃O6.6

    Suchaneck, A. ; Hinkov, V. ; Haug, D. ; Schulz, Leander ; Bernhard, Christian ; Ivanov, A. ; Hradil, K. ; Lin, C. T. ; Bourges, P. ; Keimer, B. ; Sidis, Y.

    In: Physical Review Letters, 2010, vol. 105, p. 037207

    We report an inelastic-neutron-scattering and muon-spin-relaxation study of the effect of 2% spinless (Zn) impurities on the magnetic order and dynamics of YBa₂Cu₃O6.6, an underdoped high-temperature superconductor that exhibits a prominent spin pseudogap in its normal state. Zn substitution induces static magnetic order at low temperatures and triggers a large-scale...

    Université de Fribourg

    Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba1-xKxFe₂As₂

    Park, J. T. ; Inosov, D. S. ; Niedermayer, Ch. ; Sun, G. L. ; Haug, D. ; Christensen, N. B. ; Dinnebier, R. ; Boris, A. V. ; Drew, Alan J. ; Schulz, Leander ; Shapoval, T. ; Wolff, U. ; Neu, V. ; Yang, Xiaoping ; Lin, C. T. ; Keimer, B. ; Hinkov, V.

    In: Physical Review Letters, 2009, vol. 102, no. 111, p. 117006

    Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba1-xKxFe₂As₂ by means of x-ray powder diffraction, neutron scattering, muon-spin rotation (µSR), and magnetic force microscopy (MFM). Static antiferromagnetic order sets in below Tm≈70 K as inferred from the neutron scattering and...

    Université de Fribourg

    Electronic Liquid Crystal State in the High-Temperature Superconductor YBa₂Cu₃O6.45

    Hinkov, V. ; Haug, D. ; Fauqué, B. ; Bourges, P. ; Sidis, Y. ; Ivanov, A. ; Bernhard, Christian ; Lin, C. T. ; Keimer, B.

    In: Science, 2008, vol. 319, p. 597-600

    Electronic phases with symmetry properties matching those of conventional liquid crystals have recently been discovered in transport experiments on semiconductor heterostructures and metal oxides at millikelvin temperatures. We report the spontaneous onset of a one-dimensional, incommensurate modulation of the spin system in the high-transition-temperature superconductor...

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