Effect of Tb3+ doping in mixed-valence manganites and cobaltites

K Knížek; Z Jirák; O Kaman; M Maryško; F Damay

doi:10.1088/1361-648X/aa7f1f

Effect of Tb³⁺ doping in mixed-valence manganites and cobaltites

J Phys Condens Matter. 2017 Oct 11;29(40):405802. doi: 10.1088/1361-648X/aa7f1f. Epub 2017 Jul 11.

Authors

K Knížek¹, Z Jirák, O Kaman, M Maryško, F Damay

Affiliation

¹ Institute of Physics, ASCR, Cukrovarnická 10, 162 00 Prague 6, Czechia.

PMID: 28696329
DOI: 10.1088/1361-648X/aa7f1f

Abstract

The magnetic ordering of four Tb³⁺-doped manganites and cobaltites, La_0.7Tb_0.1Sr_0.2MnO₃, La_0.7Tb_0.1Ca_0.2MnO₃, La_0.7Tb_0.1Sr_0.2CoO₃ and La_0.7Tb_0.1Ca_0.2CoO₃, have been studied by means of neutron diffraction and SQUID magnetometry. All the samples were prepared by sintering of sol-gel precursors and their orthorhombic or rhombohedral perovskite structures at room and low temperatures were refined. A long-range ferromagnetic (FM) order was detected at the Mn and Co sites. In addition, a small but significant ordered moment was observed at A sites of studied cobaltites, which was attributed to local Tb³⁺ moments, aligned by exchange interactions due to FM ordered Co sublattice. No or minor Tb³⁺ contribution was detected in studied manganites.