Structure, microstructure, and high-temperature transport properties of La1-xCaxMnO3-delta thin films and polycrystalline bulk materials

M H Aguirre; Stela Canulescu; R Robert; N Homazava; D Logvinovich; L Bocher; T H Lippert; M Doebeli; A Weidenkaff

doi:10.1063/1.2826950

Structure, microstructure, and high-temperature transport properties of La1-xCaxMnO3-delta thin films and polycrystalline bulk materials

M H Aguirre, Stela Canulescu, R Robert, N Homazava, D Logvinovich, L Bocher, T H Lippert, M Doebeli, A Weidenkaff

Paul Scherrer Institute

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Single-phase samples of La1-xCaxMnO3-delta (LCMO), x approximate to 0.3, prepared by pulsed reactive crossed beam laser ablation on SrTiO3 (STO) substrates, and soft chemistry synthesized powders were studied by various methods. The precise study of the crystal structure and microstructures by a combination of electron diffraction and high-resolution electron microscopy revealed a monoclinic distortion of the GdFeO3-type structure, P2(1)/c space group, in both types of materials, i.e., the thin films and powder compound. The analysis of the LCMO/STO interface showed nonhomogeneous stress states and a composition that results in a different superstructure from the usual detected structure. The temperature-dependent thermoelectric power in the case of thin films presented an anomalous behavior compared to those from the powder compound. A structural transition at high temperature (T approximate to 750 K) influences the thermopower behavior as well as the thermal conductivity values. (c) 2008 American Institute of Physics.

Original language	English
Journal	Journal of Applied Physics
Volume	103
Issue number	1
Pages (from-to)	013703
ISSN	0021-8979
DOIs	https://doi.org/10.1063/1.2826950
Publication status	Published - 2008
Externally published	Yes

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title = "Structure, microstructure, and high-temperature transport properties of La1-xCaxMnO3-delta thin films and polycrystalline bulk materials",

abstract = "Single-phase samples of La1-xCaxMnO3-delta (LCMO), x approximate to 0.3, prepared by pulsed reactive crossed beam laser ablation on SrTiO3 (STO) substrates, and soft chemistry synthesized powders were studied by various methods. The precise study of the crystal structure and microstructures by a combination of electron diffraction and high-resolution electron microscopy revealed a monoclinic distortion of the GdFeO3-type structure, P2(1)/c space group, in both types of materials, i.e., the thin films and powder compound. The analysis of the LCMO/STO interface showed nonhomogeneous stress states and a composition that results in a different superstructure from the usual detected structure. The temperature-dependent thermoelectric power in the case of thin films presented an anomalous behavior compared to those from the powder compound. A structural transition at high temperature (T approximate to 750 K) influences the thermopower behavior as well as the thermal conductivity values. (c) 2008 American Institute of Physics.",

author = "Aguirre, {M H} and Stela Canulescu and R Robert and N Homazava and D Logvinovich and L Bocher and Lippert, {T H} and M Doebeli and A Weidenkaff",

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doi = "10.1063/1.2826950",

language = "English",

volume = "103",

pages = "013703",

journal = "Journal of Applied Physics",

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TY - JOUR

T1 - Structure, microstructure, and high-temperature transport properties of La1-xCaxMnO3-delta thin films and polycrystalline bulk materials

AU - Aguirre, M H

AU - Canulescu, Stela

AU - Robert, R

AU - Homazava, N

AU - Logvinovich, D

AU - Bocher, L

AU - Lippert, T H

AU - Doebeli, M

AU - Weidenkaff, A

PY - 2008

Y1 - 2008

N2 - Single-phase samples of La1-xCaxMnO3-delta (LCMO), x approximate to 0.3, prepared by pulsed reactive crossed beam laser ablation on SrTiO3 (STO) substrates, and soft chemistry synthesized powders were studied by various methods. The precise study of the crystal structure and microstructures by a combination of electron diffraction and high-resolution electron microscopy revealed a monoclinic distortion of the GdFeO3-type structure, P2(1)/c space group, in both types of materials, i.e., the thin films and powder compound. The analysis of the LCMO/STO interface showed nonhomogeneous stress states and a composition that results in a different superstructure from the usual detected structure. The temperature-dependent thermoelectric power in the case of thin films presented an anomalous behavior compared to those from the powder compound. A structural transition at high temperature (T approximate to 750 K) influences the thermopower behavior as well as the thermal conductivity values. (c) 2008 American Institute of Physics.

AB - Single-phase samples of La1-xCaxMnO3-delta (LCMO), x approximate to 0.3, prepared by pulsed reactive crossed beam laser ablation on SrTiO3 (STO) substrates, and soft chemistry synthesized powders were studied by various methods. The precise study of the crystal structure and microstructures by a combination of electron diffraction and high-resolution electron microscopy revealed a monoclinic distortion of the GdFeO3-type structure, P2(1)/c space group, in both types of materials, i.e., the thin films and powder compound. The analysis of the LCMO/STO interface showed nonhomogeneous stress states and a composition that results in a different superstructure from the usual detected structure. The temperature-dependent thermoelectric power in the case of thin films presented an anomalous behavior compared to those from the powder compound. A structural transition at high temperature (T approximate to 750 K) influences the thermopower behavior as well as the thermal conductivity values. (c) 2008 American Institute of Physics.

U2 - 10.1063/1.2826950

DO - 10.1063/1.2826950

M3 - Journal article

SN - 0021-8979

VL - 103

SP - 013703

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 1

ER -

Structure, microstructure, and high-temperature transport properties of La1-xCaxMnO3-delta thin films and polycrystalline bulk materials

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