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Frustrated exchange interactions formation at low temperatures and high hydrostatic pressures in La0.70Sr0.30MnO2.85

  • Order, Disorder, and Phase Transition in Condensed System
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Abstract

The magnetic and thermal properties of the anion-deficient La0.70Sr0.30MnO2.85 manganite are investigated in wide temperature (4–350 K) range, including under hydrostatic pressure (0–1.1 GPa). Throughout the pressure range investigated, the sample is spin glass with diffused phase transition into paramagnetic state. It is established, that spin glass state is a consequence of exchange interaction frustration of the ferromagnetic clusters embeded into antiferromagnetic clusters. The magnetic moment freezing temperature T f of ferromagnetic clusters increases under pressure, freezing temperature dependence on pressure is characterized by derivative value ∼4.5 K/GPa, while the magnetic ordering T MO temperature dependence is characterized by derivative value ∼13 K/GPa. The volume fraction of sample having ferromagnetic state is V fer ∼ 13% and it increases under a pressure of 1.1 GPa by ΔV fer ≈ 6%. Intensification of ferromagnetic properties of the anion-deficient La0.70Sr0.30MnO2.85 manganite under hydrostatic pressure is a consequence of oxygen vacancies redistribution and unit cell parameters decrease. The most likely mechanism of frustrated exchange interactions formation is discussed.

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Authors and Affiliations

  1. Scientific Practical Materials Research Centre of NAS of Belarus, Minsk, 220072, Belarus

    S. V. Trukhanov & A. V. Trukhanov

  2. Low Temperatures Physics and Superconductivity Department, Moscow State University, Moscow, 119899, Russia

    A. N. Vasiliev

  3. Institute of Physics, PAS, Warsaw, 02-668, Poland

    H. Szymczak

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  1. S. V. Trukhanov
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  2. A. V. Trukhanov
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  3. A. N. Vasiliev
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  4. H. Szymczak
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Correspondence to S. V. Trukhanov.

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Original Russian Text © S.V. Trukhanov, A.V. Trukhanov, A.N. Vasiliev, H. Szymczak, 2010, published in Russian in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 138, No. 2, pp. 236–242.

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Trukhanov, S.V., Trukhanov, A.V., Vasiliev, A.N. et al. Frustrated exchange interactions formation at low temperatures and high hydrostatic pressures in La0.70Sr0.30MnO2.85 . J. Exp. Theor. Phys. 111, 209–214 (2010). https://doi.org/10.1134/S106377611008008X

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