Phase Transition from Antiferromagnetic Insulator to Ferromagnetic Metal in La2-xSrxCoO4--Magnetization and NMR Studies

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  • Phase Transition from Antiferromagnetic Insulator to Ferromagnetic Metal in La<SUB>2−<I>x</I></SUB>Sr<I><SUB>x</SUB></I>CoO<SUB>4</SUB> —Magnetization and NMR Studies—
  • Phase Transition from Antiferromagnetic
  • Phase Transition from Antiferromagnetic Insulator to Ferromagnetic Metal in La<sub>2-<i>x</i></sub>Sr<sub><i>x</i></sub>CoO<sub>4</sub>–Magnetization and NMR Studies–

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Magnetic and zero-field nuclear magnetic resonance investigations have been made on the La2−xSrxCoO4 system (x=0–1.4), one of the isomorphous compounds of the superconducting cuprates. In the La-rich region (x≤0.5), the antiferromagnetic (AF) ordering persists and the internal magnetic field at 1.4 K remains almost constant (Hint(Co)\simeq200 kOe), though the Néel temperature shows an initial strong decrease with a small amount of Sr substitution. When x increases further (x≥0.6), the AF state suddenly transforms to a ferromagnetic state and the Curie temperature shows a maximum (TC=220 K) at x=0.9. Spontaneous magnetizations at T=4.2 K are, however, non-zero (2.2–1.6 μB) only in the range of x=0.7–0.9, and Hint(Co) strongly decreases from 190 kOe (x=0.6) to below 40 kOe (x=1.1). 59Co spin-lattice relaxation time T1 for x=0.7 and 0.9 follows the relation T1T=const., suggesting it is in a metallic state.

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