Stabilization of Ferromagnetism in BiFeO3:Ho at Hydrostatic Pressure


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Abstract

The isothermal magnetization of the Bi1 – xHoxFeO3 (x = 0−0.2) multiferroic has been studied at a hydrostatic pressure up to 9 GPa in the range of room temperatures. A new anomaly at PC ≈ 3.81 GPa related to intermediate phases between the structural transition R3cPnma has been found against the background of the pressure-induced antiferromagnetic ordering in BiFeO3 (BFO) at P ≈ 2.59 GPa. It is established that the ferromagnetic behavior under pressure depends on the Ho impurity concentration: PC decreases at 0.05 ≤ x ≤ 0.1 because of the decrease in R3c bond lengths in the structure, and the stabilization of ferromagnetism is implemented at 0.1 ≤ x ≤ 0.2 probably because of the coexistence of the R3c and Pnma phases. The results of studies indicate that, in Bi1 – xHoxFeO3 with x = 0.2, the transition pressure PC = 3.7 GPa exceeds the values for BFO doped with other 4f elements (Eu, Y, Sm) in the region R3cPnma of the transition.

About the authors

T. R. Arslanov

Institute of Physics, Dagestan Scientific Center

Author for correspondence.
Email: arslanovt@gmail.com
Russian Federation, Makhachkala, 367003

S. N. Kallaev

Institute of Physics, Dagestan Scientific Center

Email: arslanovt@gmail.com
Russian Federation, Makhachkala, 367003

L. A. Reznichenko

Research Institute of Physics

Email: arslanovt@gmail.com
Russian Federation, Rostov-on-Don, 344090

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