|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure | | C. Tarantini
; K. Iida
; J. Haenisch
; F. Kurth
; J. Jaroszynski
; N. Sumiya
; M. Chihara
; T. Hatano
; H. Ikuta
; S. Schmidt
; P. Seidel
; B. Holzapfel
; D.C. Larbalestier
; | | Date: |
26 Oct 2016 | | Abstract: | The Fe-based superconductors (FBS) present a large variety of compounds whose
properties are affected to different extents by their crystal structures.
Amongst them, the $it{RE}$FeAs(O,F) ($it{RE}$1111, where $it{RE}$ is a rare
earth element) is the family with the highest critical temperature $T_c$ but
also with a large anisotropy and Josephson vortices as demonstrated in the
flux-flow regime in Sm1111 ($T_c$ $sim$ 55 K). Here we focus our attention on
the pinning properties of the lower-$T_c$ Nd1111 in the flux-creep regime. We
demonstrate that for H//c critical current density $J_c$ at high temperatures
is dominated by point-defect pinning centres, whereas at low temperatures
surface pinning by planar defects parallel to the $it{c}$-axis and vortex
shearing prevail. When the field approaches the $it{ab}$-planes, two different
regimes are observed at low temperatures as a consequence of the transition
between 3D-Abrikosov and 2D-Josephson vortices: one is determined by the
formation of a vortex staircase structure and one by lock-in of the vortices
parallel to the layers. This is the first study on FBS showing this behaviour
in a full temperature, field, and angular range and it demonstrates that,
despite the lower $T_c$ and anisotropy of Nd1111 with respect to Sm1111, this
compound is substantially affected by intrinsic pinning generating a strong
$it{ab}$-peak in $J_c$. | | Source: | arXiv, 1610.8486 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER