C M Aegerter et al 1998 J. Phys.: Condens. Matter 10 7445 doi:10.1088/0953-8984/10/33/013
Evidence for a square vortex lattice in 
from muon-spin-rotation measurements
C M Aegerter
, S H Lloyd
, C Ager§, S L Lee§, S Romer, H Keller and E M Forgan
A muon-spin-rotation study of the flux-line lattice in 
is presented. For the field parallel to the crystallographic c-direction, the observed field distribution strongly indicates a square symmetry of the vortex lattice. We determine the value of the coherence length from the upper critical field and the Ginzburg-Landau parameter which is found to be 
from the field distribution. This gives a value for the penetration depth of 
. The temperature dependence of the penetration depth is measured.
- PACS
-
74.25.Qt Vortex lattices, flux pinning, flux creep
74.25.Op Mixed states, critical fields, and surface sheaths
74.72.Jt Other cuprates, including Tl and Hg-based cuprates
74.20.De Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
- Subjects
- Dates
-
Issue 33 (24 August 1998)
Received 21 May 1998, in final form 23 June 1998
-
Evidence for a square vortex lattice in from muon-spin-rotation measurements
C M Aegerter et al 1998 J. Phys.: Condens. Matter 10 7445
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