Help Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Critical Current Oscillations in the Intrinsic Hybrid Vortex State of SmFeAs(O,F)

There are no MPG-Authors in the publication available
External Resource
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available

Moll, P. J. W., Balicas, L., Zhu, X., Wen, H.-H., Zhigadlo, N. D., Karpinski, J., et al. (2014). Critical Current Oscillations in the Intrinsic Hybrid Vortex State of SmFeAs(O,F). Physical Review Letters, 113(18): 186402. doi:10.1103/PhysRevLett.113.186402.

Cite as: https://hdl.handle.net/21.11116/0000-000B-7962-F
In layered superconductors the order parameter may be modulated within the unit cell, leading to nontrivial modifications of the vortex core if the interlayer coherence length ξc(T) is comparable to the interlayer spacing. In the iron pnictide SmFeAs(O,F) (Tc≈50  K) this occurs below a crossover temperature T≈41  K, which separates two regimes of vortices: anisotropic Abrikosov-like at high and Josephson-like at low temperatures. Yet in the transition region around T, hybrid vortices between these two characteristics appear. Only in this region around T and for magnetic fields well aligned with the FeAs layers, we observe oscillations of the c-axis critical current jc(H) periodic in 1/√H due to a delicate balance of intervortex forces and interaction with the layered potential. jc(H) shows pronounced maxima when a hexagonal vortex lattice is commensurate with the underlying crystal structure. The narrow temperature window in which oscillations are observed suggests a significant suppression of the order parameter between the superconducting layers in SmFeAs(O,F), despite its low coherence length anisotropy (γξ≈3–5).