Abstract
The observation of a substitution-induced ferromagnetic order (Tc=200 K) is reported in antiferromagnetic La0.9Sr0.1MnO3 (TN=130 K) when 0.05 of La is replaced by yttrium. Important results of ferromagnetic resonance (FMR) and high-pressure transport studies are as follows. (i) Data on FMR linewidth and resistivity provide evidence for the presence of microscopic magnetic inhomogeneities, possibly La0.9Sr0.1MnO3. (ii) For zero external pressure, a resistivity peak at 130 K due to intergrain tunneling, a secondary peak close to Tc, and magnetoresistance (MR) on the order of 30% are observed. (iii) At high pressures, the resistivity peaks shift to higher temperatures at the rate of 24–26 K/GPa and MR values decrease. (iv) An internal pressure of 3 GPa due to Y substitution is inferred from high-pressure transport studies.
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