Direct Relationship between Magnetism andMnO6Distortions inLa1−x

Abstract

Measured distortions of the Mn-O bond length distribution from x-ray-absorption fine-structure measurements are found to relate linearly to the doped hole concentration x at room temperature in La 12x Ca x MnO 3. Comparison of the distortions above and below T c for colossal magnetoresistor (CMR) samples gives an estimate of the number of delocalized holes n dh , and we find that ln͑n dh ͒~M (magnetization). These results are complementary to resistance measurements that show that ln͑r͒~2M. We have thus established the functional relationship between the electronic, spin, and lattice degrees of freedom in the CMR perovskites. [S0031-9007(97)05093-X]

Chemical potential shift induced by double-exchange and polaronic effects inNd1−xSrxMnO3Ebata1, Takizawa2, Maekawa3 et al. 2008Phys. Rev. B9230View full textAdd to dashboardCite

“…On the other hand, several local structural studies have suggested that a dynamical or local JT distortion persists in the FM phase, too. X-ray absorption fine structure (EXAFS) studies have shown that the lattice distortion of the MnO 6 octahedra is found in the FM phase of La 1−x Ca x MnO 3 at low temperatures [10,11]. From the pair-density function analysis of pulsed neutron diffraction data, the local JT distortion has been observed in the FM phase of La 1−x Sr x MnO 3 [12].…”

Hall effect ofLa2/3(Ca,Pb)Chun1, Salamon2, Han3 1999Phys. Rev. B334262View full textAdd to dashboardCite

“…We compared n ef f (T ) with ρ xx (T ) or M(T ), but no simple relation was found. In particular, no logarithmic dependence on M(T ) was seen 14 .…”

Slow crossover inYbXCu4(X=Ag, Cd, In, Mg, Tl, Zn) intermediate-valence compounds

“…27 Any static disorder should manifest as a constant offset, as is clearly shown, for example, for La 1−x Ca x MnO 3 . 28 The XAFS data were fit in r-space, following procedures in Ref. [ 24,27].…”