Abstract
Inelastic neutron scattering has been performed on semiconducting La{sub 1{minus}x}Ca{sub x}MnO{sub 3} single crystals, which exhibit a slightly canted magnetic structure at a low doping rate (x=0.05,0.08). The dynamic study reveals the coexistence of two excitation branches with very different characteristics, and local modes for x=0.05. The first branch is anisotropically dispersed and is readily attributed to spin waves; the Mn spins are coupled by exchange forces, indicating a strong decrease of the antiferromagnetic interplane coupling by doping. The second branch is weakly and isotropically dispersed, which suggests a coupling induced by the hole hopping. Its unusual q-dependent intensity reveals that this excitation is associated with a very short ferromagnetic correlation length ({approx}8{endash}10 {Angstrom}), reminiscent of a picture of mobile {open_quotes}magnetic polarons.{close_quotes} {copyright} {ital 1997} {ital The American Physical Society}
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