ESR evidence for partial melting of the orbital order inLaMnO3below the Jahn-Teller transition
نویسندگان
چکیده
منابع مشابه
Origin of Jahn-Teller distortion and orbital order in LaMnO3.
The origin of the cooperative Jahn-Teller distortion and orbital order in LaMnO3 is central to the physics of the manganites. The question is complicated by the simultaneous presence of tetragonal and GdFeO3-type distortions and the strong Hund's rule coupling between e{g} and t{2g} electrons. To clarify the situation we calculate the transition temperature for the Kugel-Khomskii superexchange ...
متن کاملJahn-Teller induced nematic orbital order in tetragonal Sr2VO4
Using high resolution x-ray diffraction (XRD) on high purity powders, we resolved the structure and ab symmetry of the intriguing compound Sr2VO4 from room temperature down to 20 K to an unprecedented level of accuracy. Upon cooling, this set of data unambiguously reveals a second-order phase transition lowering the symmetry from tetragonal to orthorhombic at a temperature Tc2 = 136 K. The obse...
متن کاملInverse Jahn-Teller transition in bimetallic oxalates.
Because of the competition between the spin-orbit coupling and the Jahn-Teller (JT) energies in Fe(II)Fe(III) bimetallic oxalates, we theoretically predict that an undistorted phase with C3 symmetry about each Fe site may be recovered at low temperatures. Both lower and upper JT transitions bracketing the ferrimagnetic transition temperature Tc are predicted for compounds that exhibit magnetic ...
متن کاملExperimental evidence for the dynamic Jahn-Teller effect in La0.65Ca0.35MnO3.
Recently, it has been argued that a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn d level plays a crucial role in understanding the nonmetal-to-metal transition observed in the La12xAxMnO3 (A5Ca,Sr,Ba! system. We show, by neutron powder diffraction, that La0.65Ca0.35MnO3 exhibits an anomalous volume and oxygen/manganese displacement change around Tc ,...
متن کاملOptical Evidence for the Dynamic Jahn-Teller Effect in Nd0.7Sr0.3MnO3.
S. G. Kaplan,1,* M. Quijada,1 H. D. Drew,1,2 D. B. Tanner,3 G. C. Xiong,2 R. Ramesh,2 C. Kwon,2 and T. Venkatesan2 1Laboratory for Physical Sciences, College Park, Maryland 20740 2Center for Superconductivity Research, Department of Physics, University of Maryland at College Park, College Park, Maryland 20742 3Department of Physics, University of Florida, Gainesville, Florida 32611 (Received 12...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2014
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.90.054424