Giant negative magnetoresistance and kinetic arrest of first-order ferrimagnetic-antiferomagnetic transition in Ge doped Mn${}_2$Sb

Abstract

Effect of Ge substitution on first order ferrimagnetic (FRI) - antiferromagnetic (AFM) transition in Mn${}_2$Sb has been studied. It shows that transition temperature (T${}_t$) can be tuned between 119~K - 271~K by substituting 2.5-10\% Ge at Sb site in Mn${}_2$Sb. The variation of density of state at Fermi level N(E${}_f$) with Ge substitution shows that dN(E)/dE is positive at E${}_f$ in the AFM state. With the application of magnetic field T${}_t$ shifts to low temperature, which results in a giant negative magnetoresistance (MR) reaching a value of 70\% for 2.5\% substitution. Our results show that FRI to AFM transformation during cooling stops around 35 K, even though it remains incomplete. It along with non-monotonic variation of lower critical field, open loop in isothermal MR and increasing difference in zero field cooled warming (ZFCW) and field cooled warming (FCW) resistivity with increasing magnetic field shows that FRI to AFM transition is kinetically arrested in the case of 2.5\% Ge substitution.

References in corpus (4)

• Relating supercooling and glass-like arrest of kinetics for phase separated systems: studies on doped CeFe${}_2$ and (La,Pr,Ca)MnO${}_3$
• Anomalous First Order Transition in $Nd{}_{0.5}Sr{}_{0.5}MnO{}_3$: An interplay between kinetic arrest and thermodynamic transitions
• Field induced magnetic transition and metastability in Co substituted $M{n}_{2}Sb$
• Real Space Visualization of Thermomagnetic Irreversibility within Supercooling and Superheating Spinodals in $M{n}_{1.85}C{o}_{0.15}Sb$ using Scanning Hall Probe Microscopy

Cited by in corpus (1)

• Low-temperature hysteresis broadening emerging from domain-wall creep dynamics in a two-phase competing system