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Reduction of critical field for magnetic and orbital-ordering phase transition in impurity-substituted Nd0.45
21. A. Y. Ramos, H. C. N. Tolentino, M. M. Soares, S. Grenier, O. Bunau, Y. Joly, F. Baudelet, F. Wilhelm, A. Rogalev, R. A. Souza, N. M. Souza-Neto, O. Proux, D. Testemale, and A. Caneiro, Phys. Rev. B 87, 220404 (2013).
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We have investigated the Mn-site substitution effect in Nd0.45Sr0.55MnO3 single crystal, which has an A-type layered antiferromagnetic (A-AFM) phase with the 3 -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 double-exchange mechanism along the AFM coupled c-direction. In Nd0.45Sr0.55Mn0.95Cr0.05O3, the A-AFM state with the orbital-order is changed into the orbital-disordered three-dimensional FM metallic state by applying magnetic field of μ0 H = 12 T, which is much smaller than that of the parent compound Nd0.45Sr0.55MnO3.
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