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Neutron powder diffraction measurements, combined with magnetization andresistivity data, have been carried out in the doped perovskiteLa$_{1-x}$Ca$_x$MnO$_3$ ($x=0.47$, 0.50, and 0.53) to elucidate the structural,magnetic, and electronic properties of the system around the compositioncorresponding to an equal number of Mn3+ and Mn4+. At room temperature allthree samples are paramagnetic and single phase, with crystallographic symmetryPnma. The samples then all become ferromagnetic (FM) at $T_C\approx 265$ K. At$\sim 230$ K, however, a second distinct crystallographic phase (denoted A-II)begins to form. Initially the intrinsic widths of the peaks are quite large,but they narrow as the temperature decreases and the phase fraction increases,indicating microscopic coexistence. The fraction of the sample that exhibitsthe A-II phase increases with decreasing temperature and also increases withincreasing Ca doping, but the transition never goes to completion to the lowesttemperatures measured (5 K) and the two phases therefore coexist in thistemperature-composition regime. Phase A-II orders antiferromagnetically (AFM)below a N\'{e}el temperature $T_N \approx 160$ K, with the CE-type magneticstructure. Resistivity measurements show that this phase is a conductor, whilethe CE phase is insulating. Application of magnetic fields up to 9 Tprogressively inhibits the formation of the A-II phase, but this suppression ispath dependent, being much stronger for example if the sample is field-cooledcompared to zero-field cooling and then applying the field. The H-T phasediagram obtained from the diffraction measurements is in good agreement withthe results of magnetization and resistivity.Comment: 12 pages, 3 tables, 11 figure

physical review. b, condensed matter

Temperature and field dependence of the phase separation, structure, and magnetic ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><…

Temperature and field dependence of the phase separation, structure, and magnetic ordering inLa1−xCax<…