Biao Hu, Gregory T. McCandless, V. O. Garlea, S. Stadler, Yimin Xiong, Julia Y. Chan, E. W. Plummer, R. Jin. Evolution of Structural and Physical Properties of Sr3(ru1-xmnx)2o7 with Mn Concentration

Natural Sciences / Physics / Condensed Matter Physics

Submitted on: Aug 26, 2012, 06:36:30

Description: Layered ruthenates are prototype materials with strong structure-property correlations. We report the structural and physical properties of double-layered perovskite Sr3(Ru1-xMnx)2O7 single crystals with 0<=x<=0.7. Single crystal x-ray diffraction refinements reveal that Mn doping on the Ru site leads to the shrinkage of unit-cell volume and disappearance of (Ru/Mn)O6 octahedron rotation when x>0.16, while the crystal structure remains tetragonal. Correspondingly, the electric and magnetic properties change with x. The electrical resistivity reveals metallic character (d rho/d T>0) at high temperatures but insulating behavior (d rho/d T<0) below a characteristic temperature T_MIT. Interestingly, T_MIT is different from T_M, at which magnetic susceptibility reaches maximum. T_MIT monotonically increases with increasing x while T_M shows non-monotonic dependence with x. The difference between T_MIT and T_M (T_MIT>T_M) becomes larger when x>0.16.

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