Pressure effects in granular La0.7Ca0.3-xSrxMnO3.

• This paper discusses the effect of hydrostatic pressure up to 0.8 GPa on magnetic properties of manganites La0.7Ca0.3 - xSrxMnO3 (0 x 0.3, x = 0.03) and magnetoresistance data in an applied magnetic field of 5.0 T. Application of pressure enlarges the temperature range of the ferromagnetic phase. Curie temperature, TC, as a function of pressure and the temperature of resistance maximum, Tp, showed an anomaly for x = 0.15. The slope of pressure dependence of TC for x < 0.15 and x > 0.15 is higher than for x = 0.15. Dependence of temperature Tp on x consists of two curves: for x 0.15 and for x 0.15. There is a sharp bend on the Tp curve at x = 0.15. The structural phase transition from orthorhombic phase (x < 0.15) to rhombohedral one (x 0.15) corresponds to that concentration.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Manganites

LaCaSrMnO3

high pressure

magnetic properties

susceptibility

Curie temperature

phase diagram

phase transitions

electrical transport properties

magnetoresistance

electrical resistance

orthorhombic structure

rhombohedral structure

Condensed matter physics

Kondenserade materiens fysik

fysik

Physics

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