Investigation of magnetic transitions through ultrasonic measurements in double-layered CMR manganite La1.2Sr1.8Mn2O7
| Autor: | Y. S. Reddy, C. Vishnuvardhan Reddy |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Condensed matter physics Magnetoresistance Atmospheric temperature range Manganite Condensed Matter::Materials Science Paramagnetism Magnetization Ferromagnetism Curie temperature Condensed Matter::Strongly Correlated Electrons General Materials Science Ultrasonic sensor Instrumentation |
| Zdroj: | Phase Transitions. 87:286-293 |
| ISSN: | 1029-0338 0141-1594 |
| DOI: | 10.1080/01411594.2013.811584 |
| Popis: | A polycrystalline, double-layered, colossal magnetoresistive manganite La1.2Sr1.8Mn2O7 is synthesized by sol-gel process and its magnetic and ultrasonic properties were investigated in the temperature range 80–300 K. The sample has Curie temperature at 124 K, where the sample exhibits a transition from paramagnetic insulator to ferromagnetic metallic state. The longitudinal sound velocity measurements show a significant hardening of sound velocity below TC, which may be attributed to the coupling between ferromagnetic spins and longitudinal acoustic phonons. The magnetization and ultrasonic studies reveal the presence of secondary transition at ≈ 260 K in this sample. The present sound velocity measurement results confirm the reliability of ultrasonic investigations as an independent tool to probe magnetic transitions in manganites. |
| Databáze: | OpenAIRE |
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