1302.4226 (Sachin B. Gupta et al.)

Observation of large positive magnetoresistance and its sign reversal in
GdRhGe    [PDF]

Sachin B. Gupta, K. G. Suresh, A. K. Nigam

Magnetic properties and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T1=31.8 K and another at T2=24 K, and field induced metamagnetic transitions over a wide temperature range. MR is found to show sign reversal just below T1 and attains large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied. The nature of magnetic structure appears to be different at the two transitions. The anomalous properties are attributed to a complex magnetic structure present below T1.

View original: http://arxiv.org/abs/1302.4226