\textbf{Phase Transitions at the Cr}$_{1-x }$\textbf{V}$_{x }$\textbf{/W(110) System}

The rich phase diagram of thin films of chromium-vanadium (Cr$_{1-x}$V$_{x})$ alloys offers a unique possibility to study the phenomena associated with the spin-density wave (SDW) ground state and quantum phase transition (QPT). Using angular-resolved photoemission (ARP) we have studied the periodicity of SDW in the region of commensurate-incommensurate phase transition followed by quantum phase transition as a function of two non-thermal parameters: film thickness and vanadium concentration. That allows probing the interplay between spatial confinement and Fermi surface topology change resulting from modification of chromium electron structure by vanadium doping.