Perovskite-structure TlMnO3: A new manganite with new properties

Wei Yi, Yu Kumagai, Nicola A. Spaldin, Yoshitaka Matsushita, Akira Sato, Igor A. Presniakov, Alexey V. Sobolev, Yana S. Glazkova, Alexei A. Belik

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We synthesize a new member of the AMnO3 perovskite manganite family (where A is a trivalent cation)?thallium manganite, TlMnO3 -under high-pressure (6 GPa) and high-temperature (1500 K) conditions and show that the structural and magnetic properties are distinct from those of all other AMnO3 manganites. The crystal structure of TlMnO3 is solved and refined using single-crystal X-ray diffraction data. We obtain a triclinically distorted structure with space group P1 (No. 2), Z = 4, and lattice parameters a = 5.4248(2) A, b = 7.9403(2) A, c = 5.28650(10) A, a = 87.8200(10)°, ß = 86.9440(10)°, and ? = 89.3130(10)° at 293 K. There are four crystallographic Mn sites in TlMnO3 forming two groups based on the degree of their Jahn-Teller distortions. Physical properties of insulating TlMnO3 are investigated with Mössbauer spectroscopy and resistivity, specific heat, and magnetization measurements. The orbital ordering, which persists to the decomposition temperature of 820 K, suggests A-type antiferromagnetic ordering with the ferromagnetic planes along the [-101] direction, consistent with the measured collinear antiferromagnetism below the Néel temperature of 92 K. Hybrid density functional calculations are consistent with the experimentally identified structure, insulating ground state, and suggested magnetism, and show that the low symmetry originates from the strongly Jahn-Teller distorted Mn3+ ions combined with the strong covalency of the Tl3+-O bonds.

Original languageEnglish
Pages (from-to)9800-9808
Number of pages9
JournalInorganic chemistry
Volume53
Issue number18
DOIs
Publication statusPublished - 2014 Sept 15
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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