Anomalous critical field dependence of Cr-Nb-Cr trilayers on niobium thickness
By: Vaidhyanathan, L. S
.
Contributor(s): Baskaran, R.
Publisher: New Delhi CSIR 2022Edition: Vol.60(3), Mar.Description: 198-203p.Subject(s): Humanities and Applied SciencesOnline resources: Click here
In:
Indian journal of pure & applied physics (IJPAP)Summary: Cr-Nb-Cr trilayer thin films were deposited using DC/RF sputtering with Cr layer thickness maintained at 7.5 nm and Nb
thickness varying from 30 nm to 229 nm, in order to study the interplay of antiferromagnetism and superconductivity.
Various viewpoints have been expressed in the literature with respect to analyzing the anomalous properties that have been
identified in superconductor/magnetic thin films. The study of Cr-Nb-Cr thin films were taken up to identify the existence of
similar anomalous superconducting properties on account of antiferromagnetic-superconductor interfaces. X-ray reflectivity
measurements showed high quality of thin film structure with minimum surface and interface roughness. Transport
measurements down to 2K were carried out in the presence of magnetic fields up to 2 T applied perpendicular to the
trilayers to deduce Tc. The suppression of Tc due to Cr layer is larger than proximity effect of similar metal films. It could be
explained by proximity effect using antiferromagnetic Cr layer. Upper critical field measurements show a distinct non
monotonic dependence of upper critical magnetic field and the slope on Nb layer thickness. The analysis due to WHH
theory to deduce upper critical fields for the trilayer thin films studied did not match with experimental values. Although
studies performed on Cr-Nb-Cr trilayers did not show any anomaly in Tc, it clearly showed a depression of Tc much larger
than proximity effect, non monotonic behavior in Bc2(0) and dBc 2/dT c behavior with Nb layer thickness.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
|---|---|---|---|---|---|---|
Articles Abstract Database
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School of Engineering & Technology Archieval Section | Not for loan | 2022-1889 |
Cr-Nb-Cr trilayer thin films were deposited using DC/RF sputtering with Cr layer thickness maintained at 7.5 nm and Nb
thickness varying from 30 nm to 229 nm, in order to study the interplay of antiferromagnetism and superconductivity.
Various viewpoints have been expressed in the literature with respect to analyzing the anomalous properties that have been
identified in superconductor/magnetic thin films. The study of Cr-Nb-Cr thin films were taken up to identify the existence of
similar anomalous superconducting properties on account of antiferromagnetic-superconductor interfaces. X-ray reflectivity
measurements showed high quality of thin film structure with minimum surface and interface roughness. Transport
measurements down to 2K were carried out in the presence of magnetic fields up to 2 T applied perpendicular to the
trilayers to deduce Tc. The suppression of Tc due to Cr layer is larger than proximity effect of similar metal films. It could be
explained by proximity effect using antiferromagnetic Cr layer. Upper critical field measurements show a distinct non
monotonic dependence of upper critical magnetic field and the slope on Nb layer thickness. The analysis due to WHH
theory to deduce upper critical fields for the trilayer thin films studied did not match with experimental values. Although
studies performed on Cr-Nb-Cr trilayers did not show any anomaly in Tc, it clearly showed a depression of Tc much larger
than proximity effect, non monotonic behavior in Bc2(0) and dBc 2/dT c behavior with Nb layer thickness.
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