Magnetic transitions and electrical transport in lanthanum strontium manganite: Effects of substitutions and high pressure
نویسندگان
چکیده
The observation of a substitution-induced ferromagnetic order ~Tc5200 K! is reported in antiferromagnetic La0.9Sr0.1MnO3 ~TN5130 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. © 2001 American Institute of Physics. @DOI: 10.1063/1.1388872#
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