Knížek K, Jirák Z, Kaman O, Maryško M, Damay F
Institute of Physics, ASCR, Cukrovarnická 10, 162 00 Prague 6, Czechia.
J Phys Condens Matter. 2017 Oct 11;29(40):405802. doi: 10.1088/1361-648X/aa7f1f. Epub 2017 Jul 11.
The magnetic ordering of four Tb-doped manganites and cobaltites, LaTbSrMnO, LaTbCaMnO, LaTbSrCoO and LaTbCaCoO, 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 Tb moments, aligned by exchange interactions due to FM ordered Co sublattice. No or minor Tb contribution was detected in studied manganites.
通过中子衍射和超导量子干涉仪磁力测量法，对四种掺铽的锰酸盐和钴酸盐（LaTbSrMnO、LaTbCaMnO、LaTbSrCoO和LaTbCaCoO）的磁有序性进行了研究。所有样品均通过溶胶-凝胶前驱体烧结制备，并对其在室温和低温下的正交或菱面体钙钛矿结构进行了精修。在锰和钴位点检测到长程铁磁（FM）有序。此外，在研究的钴酸盐的A位点观察到一个小但显著的有序磁矩，这归因于局部铽磁矩，由于FM有序的钴亚晶格通过交换相互作用排列。在研究的锰酸盐中未检测到或检测到极小的铽贡献。
