Physics – Condensed Matter
Scientific paper
1995-08-21
Phys. Rev. B 53, 14285 (1996).
Physics
Condensed Matter
Submitted to Phys. Rev. B. (03Aug95) Uuencoded gz-compressed .tar file of Postscript text (12 pages) and 6 figures. Also avail
Scientific paper
10.1103/PhysRevB.53.14285
Neutron scattering studies on a single crystal of the highly-correlated electron system, La1-xSrxMnO3 with x~0.3, have been carried out elucidating both the spin and lattice dynamics of this metallic ferromagnet. We report a large measured value of the spin wave stiffness constant, which directly shows that the electron transfer energy of the d band is large. The spin dynamics, including magnetic critical scattering, demonstrate that this material behaves similar to other typical metallic ferromagnets such as Fe or Ni. The crystal structure is rhombohedral, as previously reported, for all temperatures studied (below ~425K). We have observed new superlattice peaks which show that the primary rhombohedral lattice distortion arises from oxygen octahedra rotations resulting in an R-3c structure. The superlattice reflection intensities which are very sensitive to structural changes are independent of temperature demonstrating that there is no primary lattice distortion anomaly at the magnetic transition temperature, Tc = 378.1 K, however there is a lattice contraction.
Endoh Yasuo
Hirota Kaoru
Martin Michael C.
Moritomo Yutaka
Shirane Gen
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