  A new model of high-T_c superconductivity (HTSC) has been developed by us
which we find is able to explain almost all the HTSC properties, like high T_c,
origin and nature of NSPG (normal state pseudogap), anomalous superconducting
state (SS) energy gap (SSEG) properties, absence of NMR spin relaxation rate
coherence peak, existence of NSPG below T_c, nature of high-T_c magnetic
superconductivity, external magnetic field (H) dependence of the NSPG formation
temperature T*, etc. The coexistence of NSPG and SS BCS energy gap (EG), below
T_C, has been predicted by the model before its experimental observation,
showing that the observed SSEG is a superposition of NSPG and SS BCS EG. In
this paper we show that our model, called paired cluster (PC) model, is able to
explain the pseudogap critical concentration, vortex core pseudogap and
possible stripe phase in high-T_c superconductors.
