Emission Mössbauer study of CMR manganite La₀.₈Ca₀.₂MnO₃. II. Step-by-step snapshots of the metal-insulator transition

• Дата: 1997
• Автори: Chechersky, V., Nomura, K., Nath, A., Ju, H., Greene, R.L.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 1997
• Назва видання: Физика низких температур
• Теми: Низкотемпеpатуpный магнетизм
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/175714
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Emission Mössbauer study of CMR manganite La₀.₈Ca₀.₂MnO₃. II. Step-by-step snapshots of the metal-insulator transition / V. Chechersky, K. Nomura, A. Nath, H. Ju, R.L. Greene // Физика низких температур. — 1997. — Т. 23, № 7. — С. 731-737. — Бібліогр.: 29 назв. — англ.

We follow the step-by-step progression of events while approaching the Curie temperature Tc from below using ⁵⁷Co substituent as a microprobe in an emission Mössbauer study combined with resistivity measurements. In the temperature range 0.33<T/Tc ≤ 1, the material consists of a mixture of ferromagnetic and paramagnetic regions within the same matrix. An increase of the amount of paramagnetic fraction is accompanied by a decrease in electron delocalization in the ferromagnetic regions. At T≥Tc, the electrons are localized to neighboring Mn⁴⁺/Mn³⁺ pairs only, in about 46% of the paramagnetic species. The strength with which Mn atoms are bound to the neighbors also decreases progressively and rather steeply in the range 0.65<T/Tc=1. Zero field resistivity, ρ0, follows linearly with the amount of the paramagnetic phase in the range 0.65<T/Tc<1 and still shows metal-like behavior up to T/Tc≈1.03. Remove selected