Effect of strong gravitational field on oriented crystalline perovskite-type manganese oxide La1−x Sr x MnO3
- 287 Downloads
We report the effect of a strong gravitational field on oriented crystalline perovskite-type manganese oxide La1−x Sr x MnO3 (LSMO). The perovskite-type manganese oxides La1−x Sr x MnO3 (LSMO) have been investigated for giant magnetoresistance (GMR) by controlling the hole-doping level (x). A strong gravitational field can change in crystalline state and the enhancement of usual diffusion. We subjected oriented crystalline La1−x Sr x MnO3 with different grain and grain-boundary (GBs) Sr concentrations to a strong gravitational field and investigated the resulting changes in the A-site cation diffusion and physical properties of the material. Electron probe micro-analysis (EPMA) results showed appearance of the GBs where the Sr concentration was quite high compared with in other GBs. The quantitative analysis at the grain and GBs indicated that cation diffusion was more enhanced than the annealed one. The temperature dependence of the magnetic susceptibility of the gravity samples changed with the Sr concentration in the grains. The temperature dependence of the resistivity curves of the gravity sample showed several abrupt changes, which corresponded to phase transitions at the grains and GBs, which may be caused by composition changes.
KeywordsResistivity Curve Cation Diffusion Susceptibility Curve Strong Gravitational Field Gravity Experiment
The authors would like to thank T. Matsui, graduated school of Science and Technology Kumamoto University, for providing us details of techniques about measurement of the temperature dependence of resistivity.
- 4.Matraszek A, Kobertz D, Singheiser L, Hilpert K, Kuncewicz-Kupczyk W, Miller M, Schulz O (2002) Thermodynamic and cation diffusion studies of perovskites on the basis of LaGaO3 and implications for SOFC. Mater Wiss Werkst Tech 33:355–362. doi: 10.1002/1521-4052(200206)33:6<355:AID-MAWE355>3.0.CO;2-G CrossRefGoogle Scholar
- 6.Sakai N, Yamaji K, Horita T, Brito ME, Yokokawa H (2003) 12th symposium on solid oxide fuel cells in japan extended abstract. The solid Oxide Fuel Cell Sociery of Japan, Tokyo, p 68Google Scholar
- 24.Hamberger J, Krimmel A, Kurz T, Krug von Nidda HA, Ivanov VY, Mukhin AA, Ballbashov AM, Loidl A (2002) Structural magnetic, and electrical properties of single-crystalline La1−xSr-xMnO3 (0.4 < x < 0.85). Phys Rev B 66:094410. doi: 10.1103/PhysRevB.66.094410
- 25.Patil SI, Bhagat SM, Shu QQ, Lofland SE, Ogale SB, Smolyaninova VN, Zhang X, Palmer BS, Decca RS, Brown FA, Drew HD, Green RL, Troyanchuk IO, McCarroll WH (2000) Indications of phase separation in polycrystalline La1−xSrxMnO3 for x ≈ 0.5. Phys Rev B 62:9548–9554. doi: 10.1103/PhysRevB.62.9548 CrossRefGoogle Scholar