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Properties of inductance and magnetic penetration depth in (103)-oriented YBa2Cu3O7-delta thin films

Jesper Johansson (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Karin Cedergren (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Thilo Bauch (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Floriana Lombardi (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 79 (2009), 21, p. 214513.
[Artikel, refereegranskad vetenskaplig]

We present a study of the anisotropy of the inductance in (103) YBa2Cu3O7-delta (YBCO) films. YBCO superconducting quantum interference devices (SQUIDs) were fabricated by the biepitaxial technique. SQUIDs with (001)- and (103)-oriented YBCO electrodes characterized by different grain-boundary angles were realized on the same chip. Two extrainjection lines were attached to the (103) YBCO electrode. These devices, when operated in current injection mode, allow us to measure the inductance of the (103) YBCO electrode. We have found that the inductance L of the (103) YBCO can differ by a factor of 20 in the two extreme cases: L determined by current transport parallel to the ab planes and L dominated by the transport in the c-axis direction. The full in-plane angular dependence of the inductance has been obtained by considering geometrically identical SQUIDs oriented with different angles with respect to the [100] direction of the (103) film. From these measurements, we have determined the London penetration depths in the ab direction lambda(ab) and the c direction lambda(c) and their temperature dependence.

Nyckelord: barium compounds, electrodes, grain boundaries, inductance, magnetic superconductors, penetration depth (superconductivity), SQUIDs, superconducting epitaxial layers, yttrium compounds

Denna post skapades 2010-01-17. Senast ändrad 2013-05-13.
CPL Pubid: 108183


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik



Chalmers infrastruktur