Antiferro- to ferromagnetic transition and large magnetoresistance in YMn_(6)Sn_(6-x)Ti_(x) (x=0-1.0) compounds

摘要

Magnetic and transport properties of YMn_(6)Sn_(6-x)Ti_(x) (0≤x≤1.0) compounds with HfFe_(6)Ge_(6)-type structure were investigated in the temperature range of 5-400 K. The compounds with low Ti content (x≤0.2) display antiferromagnetic behavior (317 K≤T_(N)≤327 K). The Ti-rich compounds (0.8≤x≤1.0) behave as ferromagnetic in their whole magnetic ordered range (293 K≤T_(N)≤334 K). The intermediate compounds (0.4≤x≤0.6) undergo an antiferro- to ferromagnetic transition with increasing temperature. The metamagnetic transition from antiferro- to ferromagnetism can be also induced by an applied field for the antiferromagnetic compounds. The metamagnetic transition field decreases with increasing Ti concentration. The large magnetoresistance of up to 35 is observed at 5 K under 50 kOe for the compounds (0.4≤x≤0.6) with metamagnetic behavior. The evolution of the magnetic properties is discussed.