Spin-orbital ordering and mesoscopic phase separation in the double perovskite Ca 2 FeReO 6
Spin-orbital ordering and mesoscopic phase separation in the double perovskite Ca 2 FeReO 6
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DOI：
10.1103/physrevb.66.064409
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发表时间：
2002-08
影响因子：
3.7
通讯作者：
E. Granado;Qingzhen Huang;J. Lynn;J. Gopalakrishnan;R. Greene;K. Ramesha
中科院分区：
文献类型：
--
作者：
E. Granado;Qingzhen Huang;J. Lynn;J. Gopalakrishnan;R. Greene;K. Ramesha
Neutron powder diffraction measurements on ${\mathrm{Ca}}_{2}{\mathrm{FeReO}}_{6}$ reveal that this double perovskite orders ferrimagnetically and shows anomalous lattice parameter behavior below ${T}_{C}=521\mathrm{K}.$ Below $\ensuremath{\sim}300\mathrm{K}$ and $\ensuremath{\sim}160\mathrm{K}$ we observe that the high-$T$ monoclinic crystal structure separates into two and three monoclinic phases, respectively. A magnetic field suppresses the additional phases at low T in favor of the highest-$T$ phase. These manifestations of the orbital degree of freedom of Re $5d$ electrons indicate that these electrons are strongly correlated and the title compound is a Mott insulator, with competing spin-orbitally ordered states.
Neutron powder diffraction measurements on ${\mathrm{Ca}}_{2}{\mathrm{FeReO}}_{6}$ reveal that this double perovskite orders ferrimagnetically and shows anomalous lattice parameter behavior below ${T}_{C}=521\mathrm{K}.$ Below $\ensuremath{\sim}300\mathrm{K}$ and $\ensuremath{\sim}160\mathrm{K}$ we observe that the high-$T$ monoclinic crystal structure separates into two and three monoclinic phases, respectively. A magnetic field suppresses the additional phases at low T in favor of the highest-$T$ phase. These manifestations of the orbital degree of freedom of Re $5d$ electrons indicate that these electrons are strongly correlated and the title compound is a Mott insulator, with competing spin-orbitally ordered states.