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Temperature-Dependent As K-Edge EXAFS Studies of LaFe 1−x Co x AsO (x = 0.0 and 0.11) Single Crystals

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Abstract

We report the experimental results of temperature-dependent polarized As K-edge extended X-ray absorption fine structure (EXAFS) of LaFe1−x Co x AsO (x = 0.0 and 0.11) single crystals. By aligning the Fe–As bond direction in the direction of the X-ray beam polarization, we have been able to identify an anomaly in the Fe–As bond correlations at the tetragonal to orthorhombic transition at 150 K, while previous investigations with standard unpolarized EXAFS of undoped LaFeAsO powder samples were not able to detect any such anomaly. Using our approach, we have been able to identify in the superconducting doped sample, LaFe0.89Co0.11AsO, a broad anomaly around 60 K. The low-temperature anomaly has good correlations with the temperature dependence of several properties like resistivity, magnetic susceptibility and linear thermal expansion, indicating the emergence of the dynamical oscillations of the Fe–As pairs.

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Acknowledgments

We thank Y-Q Yan, R. W. McCallum and T. A. Lograsso for providing us the single crystals. We thank ESRF for the beam time allocation and Dr. O. Mathon of BM-23 for his help in the EXAFS data collection. V.G.I. and A.P.M. thank the Russian Science Foundation (project 14-22-00098) for the support.

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Authors and Affiliations

  1. Rome International Centre for Material Science Superstripes, RICMASS, Via dei Sabelli 119A, 00185, Rome, Italy

    Boby Joseph, Nicola Poccia & Antonio Bianconi

  2. Elettra Sincrotrone Trieste, Strada Statale 14, Km 163.5, Basovizza, 34149, Trieste, Italy

    Boby Joseph

  3. Deutsches Elektronen-Synchrotron (DESY), P10/PETRAIII - Coh. X-ray Group, Notkestraße 85, 22607, Hamburg, Germany

    Alessandro Ricci

  4. NEST Istituto Nanoscienze-CNR and Scuola Normale Superiore, Pisa, Italy

    Nicola Poccia

  5. Department of Physics of Solid State and Nanosystems, National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), Kashirskoe sh. 31, 115409, Moscow, Russia

    Valentin G. Ivanov, Andrey A. Ivanov, Alexey P. Menushenkov & Antonio Bianconi

  6. Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy

    Naurang L. Saini

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  1. Boby Joseph
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Joseph, B., Ricci, A., Poccia, N. et al. Temperature-Dependent As K-Edge EXAFS Studies of LaFe 1−x Co x AsO (x = 0.0 and 0.11) Single Crystals. J Supercond Nov Magn 29, 3041–3047 (2016). https://doi.org/10.1007/s10948-016-3785-7

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