Frustrated exchange interactions formation at low temperatures and high hydrostatic pressures in La{sub 0.70}Sr{sub 0.30}Mn{sub O2.85}

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S106377611008008X· OSTI ID:21443448

Trukhanov, A V ^[1]; Vasiliev, A N ^[2]; Szymczak, H ^[3]

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1. Scientific Practical Materials Research Centre of NAS of Belarus (Belarus)
2. Moscow State University, Low Temperatures Physics and Superconductivity Department (Russian Federation)
3. Institute of Physics, PAS (Poland)

The magnetic and thermal properties of the anion-deficient La{sub 0.70}Sr{sub 0.30}MnO{sub 2.85} 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{sub f} of ferromagnetic clusters increases under pressure, freezing temperature dependence on pressure is characterized by derivative value {approx}4.5 K/GPa, while the magnetic ordering T{sub MO} temperature dependence is characterized by derivative value {approx}13 K/GPa. The volume fraction of sample having ferromagnetic state is V{sub fer} {approx} 13% and it increases under a pressure of 1.1 GPa by {Delta}V{sub fer} {approx} 6%. Intensification of ferromagnetic properties of the anion-deficient La{sub 0.70}Sr{sub 0.30}MnO{sub 2.85} 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.

• OSTI ID: 21443448
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 111, Issue 2; Other Information: DOI: 10.1134/S106377611008008X; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANIONS
ANTIFERROMAGNETISM
EXCHANGE INTERACTIONS
FREEZING
LANTHANUM COMPOUNDS
MAGNETIC MOMENTS
MAGNETIZATION
MANGANATES
OSMIUM COMPOUNDS
OXYGEN
PARAMAGNETISM
PHASE STABILITY
PHASE STUDIES
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SPIN GLASS STATE
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
VACANCIES
CHARGED PARTICLES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELEMENTS
INTERACTIONS
IONS
MAGNETISM
MANGANESE COMPOUNDS
NONMETALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POINT DEFECTS
PRESSURE RANGE
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
STABILITY
TRANSITION ELEMENT COMPOUNDS