  The individual k\parallel and k\perp stripe excitations in fluctuating
spin-charge stripes have not been observed yet. In Raman scattering if we set,
for example, incident and scattered light polarizations to two possible stripe
directions, we can observe the fluctuating stripe as if it is static. Using the
different symmetry selection rule between the B1g two-magnon scattering and the
B1g and B2g isotropic electronic scattering, we succeeded to obtain the
k\parallel and k\perp strip magnetic excitations separately in La2-xSrxCuO4.
Only the k\perp stripe excitations appear in the wide-energy isotropic
electronic Raman scattering, indicating that the charge transfer is restricted
to the direction perpendicular to the stripe. This is the same as the Burgers
vector of an edge dislocation which easily slides perpendicularly to the
stripe. Hence charges at the edge dislocation move together with the
dislocation perpendicularly to the stripe, while other charges are localized. A
looped edge dislocation has lower energy than a single edge dislocation. The
superconducting coherence length is close to the inter-charge stripe distance
at x \le 0.2. Therefore we conclude that Cooper pairs are formed at looped edge
dislocations. The restricted charge transfer direction naturally explains the
opening of a pseudogap around (0, {\pi}) for the stripe parallel to the b axis
and the reconstruction of the Fermi surface to have a flat plane near (0,
{\pi}). They break the four-fold rotational symmetry. Furthermore the
systematic experiments revealed the carrier density dependence of the isotropic
and anisotropic electronic excitations, the spin density wave and/or charge
density wave gap near ({\pi}/2, {\pi}/2), and the strong coupling between the
electronic states near ({\pi}/2, {\pi}/2) and the zone boundary phonons at
({\pi}, {\pi}).
