Magnetoresistance reversal in antiperovskite compound Mn3Cu0.5Zn0.5N

Abstract

We report detailed investigations of the structure, magnetic properties, electronic transport, and specific heat in Mn-based antiperovskite compounds Mn3Cu0.5Zn0.5N. Most strikingly, there are several fascinating features: (i) The magnetoresistance at 30 kOe (40 kOe) exceeds ∼1% (∼2%) over a temperature span of ∼70 K (∼25 K) from 5 to 140 K; (ii) magnetoresistance fluctuates at temperatures of 100–200 K, including an obvious sign reversal from negative to positive at ∼140 K. Analysis of the specific heat reveals that the magnetoresistance reversal may originate from the reconstruction of the Fermi surface accompanying an antiferromagnetic-ferromagnetic transition.

Spin-glass-like behavior and negative thermal expansion in antiperovskite Mn3Ni1−xCuxN compounds

“…Antiperovskite manganese compounds Mn 3 AX (A ¼ main group and transitional elements; X ¼ N or C) have exhibited a variety of interesting physical properties, such as negative thermal expansion (NTE), 1-6 spin glass behavior, [33][34][35] giant magnetoresistance (GMR), [7][8][9] piezomagnetic effect, 10 magnetocaloric effect (MCE), 11 and near-zero temperature coefficient of resistivity (NZ-TCR), [12][13][14] due to their intrinsic characteristics, which involve strong correlations among lattice, spin, and charge degrees of freedom. 15 Experimental and theoretical investigations have suggested that the novel and unique physical properties are mainly associated with the complex magnetic structures, which can be tuned by chemical doping or element substitution.…”

Role of Tin and Carbon in the magnetic interactions in Mn3SnC

“…In recent times, Mn based antiperovskites have attracted considerable attention in terms of both fundamental research as well as potential technological applications. A first order magnetostructural transition found in these compounds is responsible for many such properties like, large magnetocaloric effect (MCE) [1,2,3], giant magnetoresistance (GMR) [4,5,6], the invar effect, giant negative thermal expansion [7], near zero temperature coefficient of resistance [8,9], magnetostriction [10] and piezomagnetic effects [11].…”

Packing fraction related distortion of Mn6C octahedra and its effect on the first order magnetic transition in Mn based antiperovskites

“…The considerable attention received by antiperovskite materials is due to the wide range of properties such as superconductivity 1,2 , giant magnetoresistance 3,4 , magnetostriction effect 5 , large magnetocaloric effect and giant negative thermal expansion (NTE) [6][7][8][9][10] demonstrated by them. The properties shown by these materials are associated with a first-order magnetostructural transition from paramagnetic or ferromagnetic to an antiferromagnetic state 6 .…”