التفاصيل البيبلوغرافية
| العنوان: |
Study of Magnetotransport and Low Temperature Anomaly in Half doped Lanthanum Calcium Manganite Nanoparticle. |
| المؤلفون: |
Saw, Ajay Kumar, Channagoudra, Ganesha, Hunagund, Shivakumar, Fu Hao, Hadimani, Ravi L., Dayal, Vijaylakshmi |
| المصدر: |
AIP Conference Proceedings; 5/24/2019, Vol. 2115 Issue 1, p030437-1-030437-4, 4p |
| مصطلحات موضوعية: |
LOW temperatures, TRANSITION metals, LANTHANUM, MANGANITE, MAGNETICS, UNIT cell |
| مستخلص: |
Electronic and magneto transport properties of nano particles of La0.5Ca0.5MnO3 synthesized using citrate route have been studied. X-ray diffraction data of the sample is fitted to the orthorhombic unit cell structure crystallizing in Pnma space group. The sample exhibits metal to insulator transition (TMI) at 89 K in the absence of magnetic field. With the application of magnetic field the resistivity decreases significantly over a wide temperature range e.g. from lowest temperature of measurement to ~250 K. This indicates that FM interaction starts dominating well above observed TMI. This is further supported by isothermal magnetoresistivity measurement which shows paramaganetic like behaivour at 300 K and ferromagnetic like below 200 K. At 250 K magnetoresistivity seems to be typical of paramagnetic and ferromagnetic behaviour. The lower TMI appears to be due to nano-particle nature of the sample where surface could be insulating. The evidence of metallic core is also seen in isothermal magnetoresistivity data which shows low field magnetoresistivity of about 30% and is expected due to spin polarized tunneling between two ferromagnetic grains. Besides, the sample also clearly reveals the unusual low temperature resistivity minimum presumably due to tunneling of charge carriers within the antiferromagnetic grains. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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