Neutron Powder Diffraction and Magnetometry Investigations of the La0.70Sr0.30MnO2.85 Manganite
Abstract:The results of neutron diffraction studies of the La0.70Sr0.30MnO2.85 compound and his behavior in an external magnetic field are stated. It is established that in the 4–300 K temperature range in the sample the two structural perovskite phases coexist, which differ in symmetry (groups R3c and I4/mcm). The reason for the phase separation is the clustering of oxygen vacancies. The temperature (4–300 K) and field (0–140 kOe) dependences of the specific magnetic moment are measured. It is found that in zero external field the magnetic state of La0.70Sr0.30MnO2.85 is a cluster spin glass, which is the result of frustration of the Mn3+–O–Mn3+ exchange interactions. The increase of the external magnetic field up to 10 kOe leads to fragmentation of the ferromagnetic clusters, and then to increase the degree of polarization of local spins of manganese and the emergence of long-range ferromagnetic order. With increasing magnetic field up to 140 kOe, the magnetic ordering temper- ature reaches 160 K. The analysis of the causes of the structural and magnetic phase separation of this composition and formation mechanism of its spin-glass magnetic state is carried out.
Document Type: Research Article
Publication date: 2012-04-01
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- Journal of Spintronics and Magnetic Nanomaterials is an international multidisciplinary peer-reviewed journal reporting new developments in the fields of magnetic and spintronics materials including their synthesis, characterization, properties, and applications in electronics, photonics, telecommunications, computer sciences, medicine, health science, etc. JSM is the first journal devoted to the exciting field of spintronics, which is playing a fundamental role in the novel technological developments based on the new spin torque transfer phenomena.
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