报告人：Mikhail V. Talanov

时 间：2024年5月16日10:00~12:00

地 点：物理实验中心229会议室

摘要：The talk will report on our most recent results on the discovery of a new class of relaxor ferroelectrics - geometrically frustrated relaxors. In this study, we introduce a novel class of relaxor materials which can be named as geometrically frustrated relaxors, with a Bi2Ti2O7 single crystal featuring a compositionally ordered pyrochlore structure as a prime example [1]. Our research reveals the canonical relaxor behavior of this material, characterized by dielectric anomalies, dipole freezing, non-ergodicity, and the absence of spontaneous phase transitions. Additionally, we observe the emergence of a unique dipole ice state upon cooling, that is a consequence of competing order parameters, which leads to geometric frustration within the crystal lattice. These findings introduce a new perspective on the manifestation of geometrical frustration in non-magnetic media, paving the way for the exploration of exotic ground states and advanced functionalities in dielectric materials.

[1] Bush A.A., Talanov M.V., et al. 2020, Cryst. Growth Des., 20, 2, 824-831.

简历：Talanov M.V., born in 1988, entered the Faculty of High Technologies of Rostov State University (now Southern Federal University) in 2005, and graduated with honors in February 2011. Since 2008, in parallel with his studies at the Department of System Analysis and Management of the Faculty of High Technologies, he has been engaged in the development, creation and comprehensive research of multifunctional ferroelectric materials at the Research Institute of Physics of Southern Federal University. Since 2023, he has been working as a leading researcher in the Terahertz Spectroscopy Laboratory of the Moscow Institute of Physics and Technology. For 2019-2024, 41 works were published in journals indexed by Scopus, of which 16 papers – in Q1 and Q2 journals, including the high-ranking journals Chemistry of Materials (IF = 9.5) and Acta Materialia (IF = 9.4, 3 articles); H-index (Scopus): 13. He developed the author's course on special sections of materials science for first-year master’s students at the Scientific Research Institute of Physics of Southern Federal University (SFU). He developed the author's course on multiferroics for fourth-year undergraduates at the Physics Faculty of SFU and third-year students at MIPT.

联系方式：13621092854

邀请人： 李家方

网 址：/

承办单位：物理学院、先进光电量子结构设计与测量教育部重点实验室