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Single crystals of LnFeAsO1-xFx (Ln=La, Pr, Nd, Sm, Gd) and Ba1-xRbxFe2As2: growth, structure and superconducting properties | | J. Karpinski
; N.D. Zhigadlo
; S. Katrych
; Z. Bukowski
; P. Moll
; S. Weyeneth
; H. Keller
; R. Puzniak
; M. Tortello
; D. Daghero
; R. Gonnelli
; I. Maggio-Aprile
; Y. Fasano
; O. Fischer
; B. Batlogg
; | | Date: |
2 Feb 2009 | | Abstract: | A review of our single crystals investigations 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.
Structure investigation 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 fields, while in to Ba1-xRbxFe2As2, the resistive
transition 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 field.
The anisotropy of the 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 Tunnelling Spectroscopy reveals in addition to a superconducting gap,
also feature at high energy (~20 meV). | | Source: | arXiv, 0902.0224 | | Services: | Forum | Review | PDF | Favorites | |
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