OptimalTCin Layered Manganites: Different Roles of Coherent and Incoherent Lattice Distortions
作者： M. Medarde , J. F. Mitchell , J. E. Millburn , S. Short , J. D. Jorgensen
DOI: 10.1103/PHYSREVLETT.83.1223
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摘要: Neutron powder diffraction experiments on layered manganites La{sub 2{minus}2x} Sr{sub 1+2x} Mn{sub 2}O {sub 7} (0.32{le}x{le}0.40) show that coherent lattice anomalies observed at the Curie temperature (lattice parameters, Mn-O bond lengths) reverse sign x{approx}0.36 , coinciding with maximum T{sub C}{approx}131 K . Remarkably, are completely suppressed this crossover composition. Incoherent distortions, as measured by anisotropic Debye-Waller factors, undergo an abrupt decrease below C} The magnitude of anomaly changes very little x and does not display any reversal for {copyright} {ital 1999} American Physical Society}
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