Dynamic phase separation inLa5∕8−yPryCa3∕8

Electric field driven dynamic percolation in electronically phase separated (La0.4Pr0.6)Jeen1, Biswas2 2013Phys. Rev. B321310View full textAdd to dashboardCite

“…It has been shown that the FPS state in which the FMM regions behave in a dynamic, fluid-like fashion, occurs only during the cooling cycle [7,12]. Such dynamic behavior in the phase coexistence region has also been observed using magnetization, noise, and neutron diffraction measurements [25][26][27]. In the warming cycle, the phase boundaries are pinned and the FPS state is suppressed as has been directly shown using low temperature magnetic force microscopy [7].…”

Colossal magnetocapacitance and scale-invariant dielectric response in phase-separated manganites

“…As temperature is lowered through T ↓↑ IM,⊥ (H), the competition of phases on microscopic (~100 Å) length scales in the PLSC region crosses over to a competition on macroscopic (~1 µm) length scales in which the metallic fraction of area covered increases rapidly from C min /C AlOx =10 -3 to unity as large clusters of the FMM phase dominate 10,11 . A full understanding of these results will be a challenge to the contrasting theories of phase separation and competition in manganites based on intrinsic disorder 12 , long range strain interactions 13 , blocked metastable states 14 or thermally equilibrated electronically soft phases 15 .…”

“…We distinguish two distinct strain-related direction-dependent insulator-metal (IM) transitions and use Cole-Cole plots to establish a heretofore unobserved collapse of the dielectric response onto a universal scale-invariant power-law dependence over a large range of frequency, temperature and magnetic field. The resulting phase diagram defines an extended region where the competing interaction of the coexisting ferromagnetic metal (FMM) and charge-ordered insulator (COI) phases [10][11][12][13][14][15] has the same behavior over a wide range of temporal and spatial scales. At low frequency, corresponding to long length scales, the volume of the phase diagram collapses to a point defining the zero-field IM percolation transition in the perpendicular direction.…”

Magnetic fingerprints of the very fast jumps of colossal magnetoresistance in the phase-separated manganiteLa0.225Pr0.40Ca0.375MnMaciá1, Abril2, Hernández-Mínguez3 et al. 2008Phys. Rev. BSelf Cite

“…The conjunction between these spread FOPTs with a slow growing dynamic of the equilibrium low temperature phase against the metastable one gives rise to the formation of nonequilibrium "glasslike behaved" states, which are frozen below a state-dependent blocking temperature. 6 The list of known systems sharing this behavior is quickly increasing: 7,8 magnetoresistant manganites, 5,7,8 doped CeFe 2 , 9,10 magnetocaloric Gd 5 Ge 4 , 11,12 etc. The most spectacular feature displayed by these kinds of systems is perhaps the existence of fieldinduced magnetic avalanches ͑MAs͒ at low temperatures.…”