Second spin-density wave phase in metallic V2-yO3 close to the metal-insulator transition - art. no. 184435

We have observed two spin-density wave phases in hole-doped metallic V2-yO3 , one evolves from the other as a function of doping. pressure, or temperat ure. They differ in their response to an external magnetic field, which can also induce a transition between them. The phase boundary between these tw o states in the temperature-, doping-, and pressure-dependent phase diagram has been determined by magnetization and magnetotransport measurements. On e phase exists at high doping level and has already been described in the l iterature. The second phase is found in a small parameter range close to th e boundary to the antiferromagnetic insulating phase. The quantum-phase tra nsitions between these states as a function of pressure and doping and the respective metamagnetic behavior observed in these phases are discussed in the light of structurally induced changes of the band structure.