Pressure Effects on Transport Properties of (La_0.85Sr_0.15)_yMnO₃ Single Crystals

Abstract:

We have studied single crystals with same La/Sr ratio but different initial Mn concentration, namely (La_0.85Sr_0.15)_0.93MnO₃ and (La_0.85Sr_0.15)_0.97MnO₃. We have observed, that the temperature of insulator-metal transition T_IM increases for both samples and the temperature of charge ordering T_CO increases for (La_0.85Sr_0.15)_0.93MnO₃ and decreases for (La_0.85Sr_0.15)_0.97MnO₃ with the external hydrostatic pressure in the range of 0.1 MPa - 1.3 GPa. After analysis of obtained dependence, we have concluded that (La_0.85Sr_0.15)_0.97MnO₃ sample has higher concentration of Mn vacancy. Thereby we suppose that growth of Mn vacancy concentration decreases transfer interaction of the conducting electrons and enhances charge ordering of Mn³⁺ and Mn⁴⁺ ions.

• Periodical: Solid State Phenomena (Volumes 233-234)
• Pages: 273-276
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.233-234.273
• Online since: July 2015
• Authors: Aleksandr Shakin*, Denis Abashev, Dmitry Shulyatev, Roman Privezentsev, Nikolay Andreev, Yakov Mukovskii
• Keywords: Charge Order, Hydrostatic Pressure, Manganese Perovskites

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