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research article
Microscopic neutron investigation of the Abrikosov state of high-temperature superconductors
Using small angle neutron scattering we have been able to observe for the first time a well-defined vortex lattice (VL) structure both in the hole-doped LSCO and electron-doped NCCO superconductors. Our measurements on optimally doped LSCO reveal the existence of a magnetic field-induced phase transition from a hexagonal to a square coordination of the VL. Various scenarios to explain such phase transition are presented. In NCCO also a clear square VL could be detected, which is unexpectedly kept down to the lowest measurable magnetic fields.
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Type
research article
Authors
Publication date
2008
Published in
Volume
71
Issue
4
Start page
679
End page
685
Peer reviewed
NON-REVIEWED
EPFL units
Available on Infoscience
September 11, 2013