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26 April 2024 |
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Fishtail effect and vortex dynamics in LiFeAs single crystals | | A. K. Pramanik
; L. Harnagea
; C. Nacke
; A. U. B. Wolter
; S. Wurmehl
; V. Kataev
; B. Büchner
; | | Date: |
24 Sep 2010 | | Abstract: | We investigate the fishtail effect, critical current density ($J_c$) and
vortex dynamics in LiFeAs single crystals. The sample exhibits a second peak
(SP) in the magnetization loop only with the field $||$ c-axis. We calculate a
reasonably high $J_c$, however, values are lower than in ’Ba-122’ and
’1111’-type FeAs-compounds. Magnetic relaxation data imply a strong pinning
which appears not to be due to conventional defects. Instead, its behavior is
similar to that of the triplet superconductor Sr$_2$RuO$_4$. Our data suggest
that the origin of the SP may be related to a vortex lattice phase transition.
We have constructed the vortex phase diagram for LiFeAs on the
field-temperature plane. | | Source: | arXiv, 1009.4896 | | Services: | Forum | Review | PDF | Favorites | |
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