Andreev bound states and paramagnetic effect at low temperatures in YBCO thin films
Arkhipova E. A.1, El’kina A. I.1, Masterov D. V.1, Pavlov S. A.1, Parafin A. E.1, Pestov E. E.1, Yunin P. A.1,2, Savinov D. A.
1,2
1Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
2Lobachevsky State University, Nizhny Novgorod, Russia
Email: savinovda@ipmras.ru
In this work, non-contact studies of a series of thin epitaxial YBa2Cu3O7-x (YBCO) films with different orientations of the a and b axes relative to the film boundaries were carried out. The thicknesses of the films ranged from 2 to 20 nm. From the induction measurements, an anomaly low-temperature increase in the London penetration depth λ was observed for several samples below 7-8 K up to 1 K. Within the method of nonlinear near-field microwave microscopy, an increase in the nonlinear microwave response was observed with a decrease in temperature for the samples with the smallest thickness. The experimental results obtained can be related to the presence of Andreev bound states localized near the film boundaries with a certain orientation relative to a and b axes. The presence of these states leads to a paramagnetic effect at low temperatures. The effects of film boundaries and the film thicknesses are discussed. Keywords: YBCO thin films, London penetration depth, nonlinear response, third harmonic power, Andreev bound states, paramagnetic effect at low temperatures.
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