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Fe–As Bond Fluctuations in a Double-Well Potential in LaFeAsO

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Abstract

While for a long time, iron-based superconductors have been investigated looking at the average crystalline structure, there is now growing interest on the divergence of local from the average structure. Here, we use advanced data analysis of EXAFS, a fast and local probe, which has key advantages compared to crystallographic measurements, in unveiling the dynamics of the local structure. The results show that the Fe–As pair oscillates in the double-well potential both in undoped and in cobalt-doped LaFeAsO crystals. The parameters and the characteristics of the double-well potential are determined by curve fits of the polarized EXAFS data. Temperature-dependent Fe–As pair distribution and tunneling frequency are derived from selected model of two potential wells. We observe the softening of the Fe–As oscillations at the tetragonal to orthorhombic structural phase transition at 150 K in LaFeAsO. A weak broad softening is observed while decreasing the temperature from 70 to 40 K in superconducting LaFe0.89Co0.11AsO which could be correlated with the onset of short-range charge density wave order.

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Acknowledgments

All authors thank ESRF for beam time allocation, the staff of BM-23 beam line, and Nicola Poccia and Alessandro Ricci for running the experiment; V.G.I., A.A.I, and A.P.M. thank the Russian Science Foundation (project 14-22-00098) for the financial support; and A.B. acknowledges the financial support of superstripes-onlus.

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Authors and Affiliations

  1. 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

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

    Boby Joseph

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

    Boby Joseph & Antonio Bianconi

Authors
  1. Valentin G. Ivanov
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  2. Andrey A. Ivanov
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  3. Alexey P. Menushenkov
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  4. Boby Joseph
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  5. Antonio Bianconi
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Correspondence to Antonio Bianconi.

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Ivanov, V.G., Ivanov, A.A., Menushenkov, A.P. et al. Fe–As Bond Fluctuations in a Double-Well Potential in LaFeAsO. J Supercond Nov Magn 29, 3035–3039 (2016). https://doi.org/10.1007/s10948-016-3831-5

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  • DOI: https://doi.org/10.1007/s10948-016-3831-5

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