Evidence of nanoscale structural phase separation in large bandwidth La0.2Sr0.8MnO3

Inverse photoemission spectroscopic studies on phase separated La 0.2 Sr 0.8 MnO 3

“…This material undergoes structural, electronic and magnetic phase transitions; cubic to tetragonal, metal to insulator, paramagnetic to C-type antiferromagnetic respectively, all at around Neel temperature (T N = 265 K) [3][4][5] . Our results 2,6,7 based on temperature dependent transmission electron microscopy (TEM), synchrotron based x-ray diffraction (XRD), high resolution photoemission spectroscopy revealed inhomogenities at the nanoscale. To characterize such inhomogenities, it is important to obtain the behaviour of the chemical potential as a function of the thermodynamic variable.Photoemission spectroscopy is one such tool where one can get the information of the behaviour of chemical potential shift 8 .…”

“…The second possibility can be ruled out based on our earlier high resolution XRD and TEM results [2,6]. This compound exhibits co-existence of charge ordered and twinned phase in a wide temperature range (even at 300 K) which becomes more prominent in the temperature range 260-200 K. With a decrease in temperature, it is found that the fractions of the twinned phase increase at the cost of the charge ordered phase and at 100 K there is about 10% of charge ordered phase.…”

“…Our results [6,2,7] based on temperature dependent transmission electron microscopy (TEM), synchrotron based x-ray diffraction (XRD), high resolution photoemission spectroscopy revealed inhomogeneities at the nanoscale in the temperature range 300-200 K. To characterise such inhomogeneities, it is important to obtain the behaviour of the chemical potential as a function of the thermodynamic variable. Photoemission spectroscopy is one such tool where one can get the information of the behaviour of chemical potential shift [8] through the shift in the binding energy of the core level spectra.…”

“…The material under study, La 0.2 Sr 0.8 MnO 3 , is one such kind of system, which reveals structural phase separation at the nanoscale [2]. At room temperature, this material stabilises in a simple structure namely cubic.…”

“…In strongly correlated electron systems 1 , the subtle interplay between charge, spin, lattice and orbital degrees of freedom stabilize emergent phenomena like phase separation, colossal magneto resistance, superconductivity, multiferroicity, etc. The material under study, La 0.2 Sr 0.8 MnO 3 is one such kind of system, which reveals structural phase separation at the nanoscale 2 . At room temperature, this material stabilizes in a simple structure namely cubic.…”