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.


Published in:
PRAMANA-JOURNAL OF PHYSICS, 71, 4, 679-685
Year:
2008
Laboratories:




 Record created 2013-09-11, last modified 2018-03-17


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