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Magnetization and magnetotransport of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>L</mml:mi><mml:mi mathvariant="normal">Ba</mml:mi><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5.5</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>L</mml:mi><mml:mo>=</mml:mo><…
The magnetization, resistivity, and magnetoresistance (MR) of single crystals of $\mathrm{Gd}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5.5}$ and $\mathrm{Eu}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5.5}$ are measured over a wide range of dc magnetic fields (up to $30\phantom{\rule{0.3em}{0ex}}\mathrm{T}$) and temperature. In $L\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5.5}$ $(L=\mathrm{Gd},\mathrm{Eu})$, the Co ions are trivalent and can exist in three spin states, namely, the $S=0$ low-spin (LS) state, the …