2008/06/05 by Wanjun Jiang, XueZhi Zhou, Gwyn Williams · 1 citation
Materials Science · Physics and Astronomy · #Antiferromagnetism #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #Neutron diffraction #Nucleation #Percolation (cognitive psychology) #Percolation threshold #Phase (matter) #Phase diagram #Power law #Thermal Expansion and Ionic Conductivity #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1209/0295-5075/84/47009
4 pages
arxiv created 2008/06/05 · openalex publication_date 2008/11/01 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
Detailed analyses of the temperature-dependent zero-field ac susceptibility of prototypical phase-separated (La 1- y Pr y ) 0.7 Ca 0.3 Mn 16/18 O 3 , 0⩽ y ⩽1, reveal features consistent with the presence of a Griffiths-like phase (GP), viz , an inverse susceptibility (χ -1 ) characterized by χ -1 ∝( T -T C Rand ) 1-λ with 0.05⩽λ⩽0.33 as y decreases towards y c ⩽0.85. Beyond y c =0.85, the GP is suppressed. These data, combined with previous neutron diffraction measurements, enable a phase diagram summarizing the evolution of the GP with composition to be constructed for this system; this phase diagram demonstrates the novel result that the disorder relevant for the establishment of such a phase in this system is linked closely to the relative volume fractions of the phase-separated antiferromagnetic and ferromagnetic components, even when the recently estimated double-exchange–linked percolation threshold is exceeded. The influence of electron-phonon coupling can also be seen through oxygen isotope effects.