• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.27 no.7
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• pp.452-457
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• 2014

Copper manganite thin films were fabricated on $SiN_x/Si$ substrate by metal organic decomposition (MOD) process. They were burned-out at $400^{\circ}C$ and annealed at various temperatures ($400{\sim}800^{\circ}C$) for 1h in ambient atmosphere. Their micro-structure and negative temperature coefficient of resistance (NTCR) characteristics were analyzed for micro-bolometer application. The copper manganite film with a cubic spinel structure was well developed at $500^{\circ}C$ which confirmed by XRD and HRTEM analysis. It showed a low resistivity ($47.5{\Omega}{\cdot}cm$) at room temperature and high NTCR characteristics of $-4.12%/^{\circ}C$ and $-2.15%/^{\circ}C$ at room temperature and $85^{\circ}C$, implying a good thin film for micro-bolometer application. Furthermore, its crystallinity was enhanced with increasing temperature to $600^{\circ}C$. However, the appearance of secondary phase at temperatures higher than $600^{\circ}C$ lead to deteriorate the NTCR characteristics.

• Proceedings of the Korean Magnestics Society Conference
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• 2004.12a
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• pp.2-2
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• 2004

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.280.1-280.1
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• 2007

• Proceedings of the Materials Research Society of Korea Conference
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• 2001.11a
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• pp.119-119
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• 2001

• Proceedings of the Korean Magnestics Society Conference
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• 2009.05a
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• pp.32-33
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• 2009

• Proceedings of the Korean Magnestics Society Conference
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• 2000.05a
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• pp.84-85
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• 2000

• Proceedings of the Korean Magnestics Society Conference
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• 2000.05a
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• pp.122-123
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• 2000

• Proceedings of the Korean Magnestics Society Conference
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• 2005.12a
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• pp.32-32
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• 2005

• Proceedings of the Korean Magnestics Society Conference
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• 2011.12a
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• pp.155-155
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• 2011

• Bulletin of the Korean Chemical Society
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• v.24 no.5
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• pp.573-578
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• 2003

The structural, magnetic, and transport properties of a mono-layered manganite $La_{0.7}Sr_{1.3}MnO_{4+{\delta}}$ were investigated using variable temperature neutron powder diffraction as well as magnetization and transport measurements. The compound adopts the tetragonal I4/mmm symmetry and exhibits no magnetic reflection in the temperature region of 10 K ≤ T ≤ 300 K. A weak ferromagnetic (FM) transition occurs about 130 K, which almost coincides with the onset of a metal-insulator (M-I) transition. Extra oxygen that occupies the interstitial site between the [(La,Sr)O] layers makes the spacing between the [MnO₂] layers shorten, which enhances the inter-layer coupling and eventually leads to the M-I transition. We also found negative magneto resistance (MR) below the M-I transition temperature, which can be understood on the basis of the percolative transport via FM metallic domains in the antiferromagnetic (AFM) insulating matrix.