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Spin and Charge Order in Single-Layered Provskite Cobaltates
H. Yoshizawa,N. Sakiyama,Y. Mitsui,I. A. Zaliznyak,S.-H. Lee 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Recent neutron scattering studies on charge and spin ordering in Pr2-xCaxCoO4 (0.39 ≤ x ≤ 0.73) and La2-xSrxCoO4 (x = 0.61) are reviewed. We found that the propagation vectors of the charge and spin order for both systems are (2δ,0,1) and (δ,0,1), respectively, in the orthorhombic notation with lattice constants a = 5.392 Å and c = 12.196 Å. δ is linearly proportional to 1-x, but it is 0.5 for 0:39 ≤ x ≤ 0:5. This indicates that while the checkerboard charge ordered state previously observed in La2-xSrxCoO4(x = 0.5) is also realized in Pr2-xCaxCoO4 with 0:39 ≤ x ≤ 0:5 and La2-xSrxCoO4 (x = 0.61), the charge ordered state for x > 0.5 is different from the checkerboard order. Instead, our results suggest that for x > 0.5, a charge-density-wave-like modulation of Co2+ and Co3+ ions occurs in the Co-O plane and that ferromagnetic stripes formed at the Co2+ sites along the b-axis are antiferromagnetically arranged along the a-axis.