Measurements of the transport properties under high pressure of an x = 0.16
crystal have revealed the disappearance, in a two-phase domain, of a low-t
emperature. orbitally ordered O " phase, as well as a discontinuous crossov
er of the ferromagnetic Curie temperature T-c at an orthorhombic-rhombohedr
al phase boundary in the narrow compositional range 0.16<x<0.17 of the syst
em La1 - xSrxMnO3. The data also suggest that the O " phase below an insula
tor-metal transition temperature T-IM is distinguishable from that between
the order-disorder transition at T-oo.