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MA: Fachverband Magnetismus

MA 31: Frustrated Magnets II (joint session MA/TT)

MA 31.10: Vortrag

Mittwoch, 11. März 2026, 12:00–12:15, POT/0361

Magnetic structure of a geometrically frustrated Mn3V2Ge3O12 garnet oxide — •Sagar Mal Kumawat¹, Tsai-Ling Liu¹, Chin-Wei Wang², Jia-Xiang Hsu^1,3, En-Pei Liu³, Wei-Tin Chen^3,4,5, and Chien-Lung Huang¹ — ¹Department of Physics and Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan 701, Taiwan — ²National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan — ³Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan — ⁴Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan — ⁵Taiwan Consortium of Emergent Crystalline Materials, National Science and Technology Council, Taipei 10622, Taiwan

We investigated the low-temperature magnetic structure and thermodynamic properties of Mn3V2Ge3O12 (MVGO) using neutron diffraction, magnetic, and heat capacity measurements. MVGO crystallizes in a cubic Ia-3d structure with a minor MnV2O4 impurity. Two successive transitions at TN1 = 4 K and TN2 = 2.4 K indicate noncollinear antiferromagnetic ordering of the frustrated V3+ and Mn2+ sublattices. Field-dependent heat capacity shows suppression of the TN1 anomaly and a shift of TN2, consistent with magnetic frustration and spin reorientation. The total magnetic entropy reaches approximately 51 J/mol K above 20 K, accounting for ~81% of the theoretical entropy for the full spin system. Temperature-dependent measurements reveal noncollinear antiferromagnetic order below TN2, with peak broadening up to TN1 indicating strong spin frustration.

Keywords: Garnet oxide; Frustrated magnetism; Neutron diffraction; hyperkagome-lattice; Magnetic Entropy