2000/10/23 by D. E. Cox, T. Iglesias, E. Moshopoulou +4
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Materials science #Monoclinic crystal system #Orthorhombic crystal system #Phase (matter) #Phase boundary #Phase diagram #Phase transition #Physics #Quantum mechanics #Rare-earth and actinide compounds #Triclinic crystal system #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.64.024431
10 pages, including 5 figures and 3 tables
arxiv created 2000/10/23 · openalex publication_date 2001/06/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The structural phase diagram of the La_1\ensuremath-xSrxMnO3 system in the compositional range 0.08<~x<~0.125 has been investigated by high-resolution synchrotron x-ray powder diffraction techniques between 20\ensuremath-600 K. Recent studies have reported that there is an unusual reentrant-type phase transition in this range involving an abrupt change in lattice parameters but no change in the crystal symmetry, which remains orthorhombic Pbnm. The transition to the reentrant phase is from a ferromagnetic metallic to a ferromagnetic insulating phase with some unusual properties. Our results demonstrate that for samples with x=0.11\ensuremath-0.125 there exist two lower-symmetry structural regions having monoclinic and triclinic symmetry, respectively. There is a sharp first-order transition from the monoclinic to the triclinic phase coinciding with the transition to the ferromagnetic insulating phase, and an abrupt crossover from the orthorhombic Pbnm region with a near-vertical phase boundary just below x=0.11. The new phases indicate the presence of some novel type of orbital ordering unlike that found in LaMnO3.