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While it is commonly accepted that the disorder induced by magnetic iondoping in quantum magnets usually generates a rugged free-energy landscaperesulting in slow or glassy spin dynamics, the disorder/distortion effectsassociated with non-magnetic ion sites doping are still illusive. Here, usingAC susceptibility measurements, we show that the mixture of Sn/Ti on thenon-magnetic ion sites of pyrochlore $Yb_2(Ti_{1-x}Sn_x)_2O_7$ induces anantiferromagnetic ground state despite both parent compounds, $Yb_2Ti_2O_7$,and $Yb_2Sn_2O_7$, order ferromagnetically. Local structure studies throughneutron total scattering reveals the local distortion in the non-magnetic ionsites and its strong correlation with the magnetic phase switching. Our study,for the first time, demonstrates the local distortion as induced by thenon-magnetic ion site mixture could be a new path to achieve magnetic phaseswitching, which has been traditionally obtained by external stimuli such astemperature, magnetic field, pressure, strain, light, etc.

Local distortion driven magnetic phase switching in pyrochlore $Yb_2(Ti_{1-x}Sn_x)_2O_7$