Navigation auf zora.uzh.ch

Search ZORA

ZORA (Zurich Open Repository and Archive)

Single crystals of LnFeAsO1−xFx (Ln=La, Pr, Nd, Sm, Gd) and Ba1−xRbxFe2As2: Growth, structure and superconducting properties

Karpinski, J; Zhigadlo, N D; Katrych, S; Bukowski, Z; Moll, P; Weyeneth, S; Keller, H; Puzniak, R; Tortello, M; Daghero, D; Gonnelli, R; Maggio-Aprile, I; Fasano, Y; Fischer, Ø; Batlogg, B (2009). Single crystals of LnFeAsO1−xFx (Ln=La, Pr, Nd, Sm, Gd) and Ba1−xRbxFe2As2: Growth, structure and superconducting properties. Physica C: Superconductivity, 469(9-12):370-380.

Abstract

A review of our investigations on single crystals of LnFeAsO1-xFx (Ln=La, Pr, Nd, Sm, Gd) and Ba1-xRbxFe2As2 is presented. A high pressure technique has been applied for the growth of LnFeAsO1-xFx crystals, while Ba1-xRbxFe2As2 crystals were grown using quartz ampoule method. Single crystals were used for electrical transport, structure, magnetic torque and spectroscopic studies. Investigations of the crystal structure confirmed high structural perfection and show less than full occupation of the (O, F) position in superconducting LnFeAsO1-xFx crystals. Resistivity measurements on LnFeAsO1-xFx crystals show a significant broadening of the transition in high magnetic fields, whereas the resistive transition in Ba1-xRbxFe2As2 simply shifts to lower temperature. Critical current density for both compounds is relatively high and exceeds 2x109 A/m2 at 15 K in 7 T. The anisotropy of magnetic penetration depth, measured on LnFeAsO1-xFx crystals by torque magnetometry is temperature dependent and apparently larger than the anisotropy of the upper critical field. Ba1-xRbxFe2As2 crystals are electronically significantly less anisotropic. Point-Contact Andreev-Reflection spectroscopy indicates the existence of two energy gaps in LnFeAsO1-xFx. Scanning Tunneling Spectroscopy reveals in addition to a superconducting gap, also some feature at high energy (~20 meV).

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Electronic, Optical and Magnetic Materials
Physical Sciences > Condensed Matter Physics
Physical Sciences > Energy Engineering and Power Technology
Physical Sciences > Electrical and Electronic Engineering
Language:English
Date:1 May 2009
Deposited On:12 Aug 2009 13:35
Last Modified:03 May 2025 01:35
Publisher:Elsevier
ISSN:0921-4534
OA Status:Green
Publisher DOI:https://doi.org/10.1016/j.physc.2009.03.048
Related URLs:http://arxiv.org/abs/0902.0224v2

Metadata Export

Statistics

Citations

Dimensions.ai Metrics
115 citations in Web of Science®
117 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

223 downloads since deposited on 12 Aug 2009
23 downloads since 12 months
Detailed statistics

Authors, Affiliations, Collaborations

Similar Publications