Jahn–Teller Ordering Dynamics in the Paraelectric BiMn7O12 Phase: 57Fe Probe Mössbauer Diagnostics

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Abstract

The electrical hyperfine interactions of the 57Fe probe nuclei stabilized in the structure of the BiMn7O12 manganite are studied by Mössbauer spectroscopy. Mössbauer spectra are measured in the para-electric temperature range, which includes the structural phase transitions I2/m ↔ Im3¯">3¯ (T1 ≈ 600 K) and Im ↔ I2/m (T2 ≈ 450 K). The calculation of the parameters of the electric field gradient tensor with allowance for the dipole contributions of Bi3+ cations in the range of the first phase transition allowed us to confirm a random orientation of the dipole moments pBi in the cubic phase of the manganite (Im3¯">3¯). Based on an analysis of the Mössbauer spectra recorded at T2 < T < T1, we considered various scenarios for the manifestation of the dynamic Jahn–Teller effect, which leads to the “melting” of the orbital order in the manganese sublattice, in terms of a two-level relaxation model.

About the authors

A. V. Sobolev

Moscow State University

Email: janglaz@bk.ru
199991, Moscow, Russia

V. I. Nitsenko

Moscow State University

Email: janglaz@bk.ru
Moscow, 119991 Russia

A. A. Belik

National Institute for Materials Science (NIMS)

Email: janglaz@bk.ru
Tsukuba 305-0044, Namiki 1-1, Ibaraki, Japan

Ya. S. Glazkova

Moscow State University

Email: janglaz@bk.ru
Moscow, 119991 Russia

M. S. Kondrat'eva

Shenzhen MSU-BIT University Shenzhen

Email: janglaz@bk.ru
Shenzhen 518115, Guangdong province, China

I. A. Presnyakov

Moscow State University;Shenzhen MSU-BIT University Shenzhen

Author for correspondence.
Email: janglaz@bk.ru
Moscow, 119991 Russia; Shenzhen 518115, Guangdong province, China

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