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Magnetism

Peculiarities of magnetic phase separation in anion-deficient La$_{0.70}$Sr$_{0.30}$MnO$_{2.85}$ manganite

S. V. Trukhanov

Scientific-Practical Materials Research Centre of NAS of Belarus

Abstract: The temperature and field dependences of the specific magnetic moment of the anion-deficient La$_{0.70}$Sr$_{0.30}$MnO$_{2.85}$ manganite have been measured. It is established, that the magnetic state of the sample studied is a cluster spin glass and it is the result of frustration of exchange Mn$^{3+}$–O–Mn$^{3+}$ interactions due to the redistribution of oxygen vacancies. The increase of the magnetic field leads to an increase in the degree of polarization of local spins of manganese. It is established using the magnetic criterion that a phase transition into the paramagnetic state for the anion-deficient La$_{0.70}$Sr$_{0.30}$MnO$_{2.85}$ manganite is a thermodynamic second order phase transition. The causes and mechanism of the magnetic phase separation are discussed.

Received: 22.11.2010
Accepted: 28.01.2011

 English version: Physics of the Solid State, 2011, 53:9, 1845–1850

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