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Structure and press...
Structure and pressure effects on the properties of La0.7Ca0.3-xSrxMnO3 manganites.
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Ulyanov, A. N. (författare)
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- Maksimov, Igor S. (författare)
- Umeå universitet,Institutionen för fysik
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- Nyeanchi, Emmanuel B. (författare)
- Umeå universitet,Institutionen för fysik
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Medvedev, Yu. V. (författare)
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Yu, Seong-Cho (författare)
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Starostyuk, N.Yu. (författare)
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- Sundqvist, Bertil (författare)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- American Institute of Physics, 2002
- 2002
- Engelska.
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Ingår i: Journal of Applied Physics vol. 91. - : American Institute of Physics. ; , s. 7739-7741
- Relaterad länk:
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http://link.aip.org/...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We report a study of the structure and pressure effects on magnetic and transport properties of a lanthanum manganite, La0.7Ca0.3–xSrxMnO3 (0<=x<=0.3, Deltax = 0.03). The pressure coefficient of the Curie temperature (Tc), dTc/dP, is shown to depend on x. The temperature Tc increases approximately linearly under applied pressure as dTc/dP[approximate]14 K/GPa in the orthorhombic (Pbnm) phase and as dTc/dP[approximate]7.5 K/GPa in the rhombohedral (R3-bar c). The value of dTc/dP shows a minimum ([approximate]3.5 K/GPa) and the temperature of the resistance maximum, Tp(x), shows a change of slope at x = 0.15, corresponding to a concentration structural phase transition. Differences between the values of dTc/dP and the slopes of Tp vs x in Pbnm and R3-bar c phases are explained by the different effect of external pressure on the Mn–O bond length and the Mn–O–Mn bond angle, and by the different internal pressure effect (depending on the value of x) in those phases, respectively.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Manganites
- high pressure
- magnetic properties
- resistance
- electrical transport properties
- lanthanum manganite
- LaCaSrMnO3
- Curie temperature
- orthorhombic structure
- rhombohedral structure
- Condensed matter physics
- Kondenserade materiens fysik
- fysik
- Physics
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)