Anisotropy of magnetoresistivities in Sr4Ru3O10: Evidence for an orbital-selective metamagnetic transition

We have investigated magnetic field orientation dependences of intraplanar and interplanar magnetoresistivity [rho(ab)(B,phi,theta) and rho(c)(B,phi,theta)] for Sr4Ru3O10, which exhibits a puzzling coexistence of ferromagnetism and metamagnetism. We find that rho(ab)(B,phi,theta) exhibits a remarkable field-dependent ferromagnetic anisotropy below and above the metamagnetic transition field B-c while rho(c)(B,phi,theta) displays anisotropy from spin polarization only when field is above B-c. These observations strongly support that the metamagnetic transition in Sr4Ru3O10 is orbital selective.