Reduction of critical field for magnetic and orbital-ordering phase transition in impurity-substituted Nd0.45Sr0.55MnO3 crystal

Abstract

We have investigated the Mn-site substitution effect in Nd 0.45 Sr 0.55 MnO 3 single crystal, which has an Atype layered antiferromagnetic (A-AFM) phase with the 3d x 2 −y 2 -type orbital-order. Substitution of Fe or Ga for Mn-site suppresses both the A-AFM order and competing ferromagnetic (FM) correlation whereas Cr substitution suppresses only the A-AFM order but reactivates the underlying FM correlation via doubleexchange mechanism along the AFM coupled c-direction. In Nd 0.45 Sr 0.55 Mn 0.95 Cr 0.05 O 3 , the A-AFM state with the orbital-order is changed into the orbital-disordered three-dimensional FM metallic state by applying magnetic field of µ 0 H = 12 T, which is much smaller than that of the parent compound Nd 0.45 Sr 0.55 MnO 3 .

Spin-dependent and spin-independent channels of electrical transport in perovskite manganites

“…There have been many investigations on the electronic transport and magnetic properties of perovskite oxides [1][2][3][4][5][6][7][8][9][10][11][12] because of their potential application in both electronic and magnetic information-storage devices. There are several models for the electronic-transport properties of these materials, and spindependent transport has been taken into account by most researchers.…”