X-Ray Diffuse Scattering due to Polarons in a Colossal Magnetoresistive Manganite

Chemical potential shift induced by double-exchange and polaronic effects inNd1−xSrxMnO3Ebata1, Takizawa2, Maekawa3 et al. 2008Phys. Rev. BSelf Cite10230View full textAdd to dashboardCite

“…We consider that the temperature-dependent splitting of the e g band may also influence the temperaturedependent chemical potential shift in the FM phase of NSMO because the intensity of the diffuse scattering due to JT effect gradually increases with increasing temperature in the FM phase, which indicates further increase of the energy splitting of the e g level [6,7,8]. If this is the case, the temperature-dependent shift would be even stronger at higher temperatures for the one-orbital case and the suppression of chemical potential shift in NSMO within the FM phase near T C cannot be explained.…”

“…They have proposed a model including the dynamical Jahn-Teller (JT) distortion of the MnO 6 octahedra in addition to the DE interaction and reproduced the experimentally observed behavior of the resistivity. It has also been proposed that the extraordinary enhancement of the resistivity in the manganites may result from the emergence of lattice polarons in the paramagnetic insulating (PI) phase [5,6,7,8]. Koo et al [9] have found that lattice polarons in Nd 0.7 Sr 0.3 MnO 3 are strongly suppressed by applying magnetic field and do not completely disappear at high fields, corresponding to an admixture of the "conducting" and "insulating" carriers.…”

“…Koo et al [9] have found that lattice polarons in Nd 0.7 Sr 0.3 MnO 3 are strongly suppressed by applying magnetic field and do not completely disappear at high fields, corresponding to an admixture of the "conducting" and "insulating" carriers. From x-ray scattering and neutron scattering studies [6,7,8], indeed, the diffuse scattering due to the lattice polarons has been observed in the high-temperature PI phase of manganites and gradually disappears with decreasing temperature in the ferromagnetic metallic (FM) phase. On the other hand, several local structural studies have suggested that a dynamical or local JT distortion persists in the FM phase, too.…”

Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

“…24 June 2018 tic neutron scattering have revealed that an additional mechanism for CMR is strong electron-lattice coupling due to Jahn-Teller interaction [7,8,9,10]. Ultrafast optical measurement using a femtosecond laser pulse is also a promising technique for investigation of such electron-lattice coupling.…”

The role of CDW gap on the magnetic phase transition in CMR materials

“…The pseudogap may be a kind of dynamic charge density wave (CDW) gap originating from the Fermi surface instability. It has been observed as super lattice reflection in X-ray and neutron scattering experiments [10][11][12]. Recently some theoretical model calculations have been used to explain the CMR effects in manganites taking band J-T effect as one of the pseudo-gaps [13][14][15].…”