Ultrafast light pulses, if they are sufficiently intense, can induce phase transitions on ultrafast timescales. It is now shown that when a system is first excited by a weak preparatory pulse, this ...

Relaxor-ferroelectrics 1,2,3 and relaxor-ferromagnets 4,5,6 have attracted a lot of attentions due to their novel physical properties and phase-transition mechanisms 7,8. Among them, there are the ...