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    Université de Fribourg

    Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$

    Mallett, Benjamin P. P. ; Wang, Chen Nan ; Marsik, Premysl ; Sheveleva, Evgeniia ; Yazdi-Rizi, Meghdad ; Tallon, Jeffery L. ; Adelmann, P. ; Wolf, Th. ; Bernhard, Christian

    In: Physical Review B, 2017, vol. 95, no. 5, p. 054512

    Using muon spin rotation and infrared spectroscopy, we study the relation between magnetism and superconductivity in Ba1−xKxFe2As2 single crystals from the underdoped to the slightly overdoped regime. We find that the Fe magnetic moment is only moderately suppressed in most of the underdoped region where it decreases more slowly than the Néel temperature TN. This applies for both the total...

    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

    Room-temperature spin crossover and Langmuir–Blodgett film formation of an iron(II) triazole complex featuring a long alkyl chain substituent: the tail that wags the dog

    Kitchen, Jonathan A. ; White, Nicholas G. ; Gandolfi, Claudio ; Albrecht, Martin ; Jameson, Guy N. L. ; Tallon, Jeffery L. ; Brooker, Sally

    In: Chemical Communications, 2010, vol. 46, no. 35, p. 6464-6466

    [FeII(C₁₆dpt)₂(NCS)₂]·⅔H₂O displays temperature-mediated spin crossover (SCO) with T½ = 290 K and the long alkyl chain substituent on the dipyridyltriazole ligand facilitates the formation of a stable Langmuir–Blodgett film at an air–water interface.

    3 résultats 1