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Directional Vortex Pinning at Microwave Frequency in YBa2Cu3O7−x Thin Films with BaZrO3 Nanorods

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Abstract

We investigate the effect of the anisotropy and of the directional pinning in YBa2Cu3O7−x films grown by pulsed laser ablation from targets containing BaZrO3 at 5 mol%. BaZrO3 inclusions self-assemble to give nanorods oriented along the c-axis, thus giving a preferential direction for vortex pinning. The directionality of vortex response is studied at high ac frequency with the complex microwave response at 48 GHz, as a function of the applied field and of the angle θ between the field and the c-axis. The complex microwave response does not exhibit any angular scaling, suggesting that the structural anisotropy of YBa2Cu3O7−x is supplemented by at least another preferred orientation. The pinning parameter r shows evidence of directional pinning, effective in a wide range of angles around the c-axis (thus ascribed to BZO nanocolumns).

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Notes

  1. We note that the same can be said of the geometrical factors G and d, see Eq. (1), which makes our conclusions fully supported by the simple analysis of the raw data for the complex resistivity shift.

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Acknowledgements

We thank S. Schweizer for the help in taking data. This work has been partially supported by the FIRB project “SURE:ARTYST” and by EURATOM. N.P. acknowledges support from Regione Lazio.

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Authors and Affiliations

  1. Dipartimento di Fisica “E. Amaldi” and Unità CNISM, Università Roma Tre, Via della Vasca Navale 84, 00146, Roma, Italy

    N. Pompeo, K. Torokhtii & E. Silva

  2. ENEA-Frascati, Via Enrico Fermi 45, 00044, Frascati, Roma, Italy

    A. Augieri, G. Celentano & V. Galluzzi

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  1. N. Pompeo
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  2. K. Torokhtii
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  3. A. Augieri
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  4. G. Celentano
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  5. V. Galluzzi
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  6. E. Silva
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Correspondence to G. Celentano.

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Pompeo, N., Torokhtii, K., Augieri, A. et al. Directional Vortex Pinning at Microwave Frequency in YBa2Cu3O7−x Thin Films with BaZrO3 Nanorods. J Supercond Nov Magn 26, 2093–2097 (2013). https://doi.org/10.1007/s10948-012-2060-9

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  • DOI: https://doi.org/10.1007/s10948-012-2060-9

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