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The structural phase diagram of the La1-xSrxMnO3 system in the compositionalrange 0.08 <= x <= 0.125 has been investigated by high-resolution synchrotronx-ray powder diffraction techniques between 20-600 K. Recent studies havereported that there is an unusual rentrant-type phase transition in this rangeinvolving an abrupt change in lattice parameters but no change in the crystalsymmetry, which remains orthorhombic Pbnm. The transition to the reentrantphase is from a ferromagnetic metallic to a ferromagnetic insulating phase withsome unusual properties. Our results demonstrate that for samples with x=0.11-0.125 there exist two lower-symmetry structural regions having monoclinicand triclinic symmetry respectively. There is a sharp first-order transitionfrom the monoclinic to the triclinic phase coinciding with the transition tothe ferromagnetic insulating phase, and an abrupt crossover from theorthorhombic Pbnm region with a near-vertical phase boundary just below x =0.11. The new phases indicate the presence of some novel type of orbitalordering unlike that found in LaMnO3.Comment: 10 pages, including 5 figures and 3 table

physical review. b, condensed matter

Vertical boundary at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>x</mml:mi><mml:mi>≈</mml:mi><mml:mn>0.11</mml:mn></mml:math>in the structural phase diagram of the<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 …

Vertical boundary atx≈0.11in the structural phase diagram of theLa1−x