Reentrant orbital order and the true ground state of LaSr2Mn2O7.
نویسندگان
چکیده
Contrary to conventional wisdom, our purified La 2-2x Sr 1+2x Mn2O7 crystals exhibit CE-type orbital and charge order as the low-temperature ground state for a hole doping level h=0.5. For small deviations from h=0.5, the high-temperature CE phase is replaced at low temperatures by an A-type antiferromagnet without coexistence. Larger deviations result in a lack of CE order at any temperature. Thus, small inhomogeneities in cation or oxygen composition could explain why others commonly see this reentrance with coexistence.
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عنوان ژورنال:
- Physical review letters
دوره 98 16 شماره
صفحات -
تاریخ انتشار 2007