Abstract
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\documentclass[12pt]{minimal}\begin{document}$d_{x^2-y^2}$\end{document}dx2−y2-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 μ0H = 12 T, which is much smaller than that of the parent compound Nd0.45Sr0.55MnO3.
Highlights
Perovskite manganites R1−xAxMnO3 (R and A being trivalent rare-earth and divalent alkalineearth ions, respectively) exhibit rich electronic phases such as charge-ordered (CO) and ferromagnetic (FM) metallic states.[1,2,3]. These electronic phases can be controlled via band-width and/or band-filling, which often leads to drastic phase conversion, i.e., the colossal magnetoresistance (CMR) effect
Much effort has been devoted to study on the impurity effect on R1−xAxMnO3 with x ≤ 0.5, but not with x > 0.5 because the CMR effect is mainly observed in R1−xAxMnO3 with x ≤ 0.5.7–14 for further understanding of the impurity effect, the impurity effect on the heavily doped manganites needs to be studied
In NSMO with 0.52 ≤ x < 0.625 including the parent compound (x=0.55) of this study, the ground state is an A-type layered AFM (A-AFM) phase with the 3dx2−y2 -type orbitalorder, in which each FM metallic layer within the ab plane is antiferromagnetically coupled with its adjacent layer along the c axis.[15,16]
Summary
Perovskite manganites R1−xAxMnO3 (R and A being trivalent rare-earth and divalent alkalineearth ions, respectively) exhibit rich electronic phases such as charge-ordered (CO) and ferromagnetic (FM) metallic states.[1,2,3] These electronic phases can be controlled via band-width and/or band-filling, which often leads to drastic phase conversion, i.e., the colossal magnetoresistance (CMR) effect. Reduction of critical field for magnetic and orbital-ordering phase transition in impurity-substituted Nd0.45Sr0.55MnO3 crystal The A-AFM order is robust against magnetic fields; in Nd0.45Sr0.55MnO3, the 2D FM to 3D FM transition occurs at μ0H = 35 T.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
