Complex long-range magnetic ordering in the Mn-bearing dugganite Pb3TeMn3P2O14

Nuclear and magnetic supercells in the multiferroic candidate: Pb3TeMn3P2O14

“…Like the Co 2 þ -containing dugganites [25,26] a large supercell was also reported for Pb 3 TeMn 3 P 2 O 14 even though the full structure solution was never obtained [27]. It was reported that the supercell was a large, pseudo-hexagonal cell incommensurate with the P321 subcell characteristic of the langasite family.…”

“…Although Rietveld refinements were performed for each measurement, the instrument was incapable of resolving the tiny supercell reflections belonging to the material reported previously [27]. Additional synchrotron x-ray diffraction (SXRD) was performed at the 11-BM line at the Advanced Photon Source (APS, Argonne, IL) as part of the SNS-APS partner program (same sample as in [27]). A Kapton tube plugged with modeling clay was used as a sample holder.…”

“…Recently, a Te 6 þ -containing subgroup of the langasites, called the dugganites after the natural mineral Pb 3 TeZn 3 As 2 O 14 [6], has been receiving interest [24][25][26][27][28][29][30]. Te 6 þ allows one to substitute divalent 3d metal ions into the trimer site due to charge balancing and preferential symmetry constraints.…”

“…Te 6 þ allows one to substitute divalent 3d metal ions into the trimer site due to charge balancing and preferential symmetry constraints. While single crystals have been hard to grow, these materials are really the first time that langasites with magnetic ions other than Fe 3 þ have been studied in detail, including Pb 3 TeCo 3 V 2 À x P x O 14 [24][25][26]29,30], Ba 3 TeCo 3 P 2 O 14 [25] and Pb 3 TeMn 3 P 2 O 14 [27,30]. It has been shown that Pb 2 þ -containing dugganites distort away from P321 symmetry.…”

“…For example, Pb 3 TeCo 3 V 2 O 14 and Pb 3 TeCo 3 P 2 O 14 each have a massive supercell on the order of six times the volume of the subcell, which obviously has important consequences on the magnetism observed in each [25][26][27]30]. But Pb 3 TeMn 3 P 2 O 14 is particularly interesting; this material indeed distorts away from P321 symmetry into a large supercell that, until now, has not been fully solved [27]. Moreover, the magnetic phase diagram and potential for magnetoelectric coupling have not yet been explored.…”