Abstract
In single-crystal La0.7Ba0.3MnO3, giant volume magnetostriction was observed for the first time to reach 2.54 × 10−4 at room temperature and a still larger level of 4 × 10−4 at the Curie point T C = 310 K in a magnetic field of 8.2 kOe. At the same temperatures and magnetic field, this effect is complemented by a colossal magnetoresistance of 15.2 and 22.7%, respectively. The volume magnetostriction ω and magnetoresistance Δρ/ρ follow similar patterns in the proximity of T C; namely, ω and Δρ/ρ are negative, maxima are observed in the |ω|(T) and |Δρ/ρ|(T) curves, and the ω and Δρ/ρ isotherms do not saturate in the highest fields applied. These phenomena are assigned to the fact that, in the above composition, there exists a two-phase magnetic (ferromagnetic-antiferromagnetic) state induced by strong s–d exchange.
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