Multipolar moments embedded in a metallic setting paves a new route to extend the landscape of novel quantum phenomena beyond the spin-only paradigm [1]. A model material platform for exploring multipolar physics is the cubic heavy-fermion system PrTr_2Al_20 (Tr = Ti, V). This system features a nonmagnetic ground state in which the magnetic dipolar moment (spin) is absent, but higher-rank multipolar moments (quadrupoles and octupoles) are active [2]. The Kondo entanglement of these local multipolar moments with conduction electrons results in a rich phase diagram comprising multipolar orders, non-Fermi liquid (NFL) phase, and exotic superconductivity [2-5]. In this talk, I will present our experimental investigation into the multipolar ordered phases multipolar quantum criticality and novel superconductivity in PrTr_2Al_20, which contrast sharply from those in the familiar magnetic settings. References [1] S. Paschen and Q. Si, Nat. Rev. Phys. 3, 9-26 (2021) [2] A. Sakai and S. Nakatsuji, J. Phys. Soc. Jpn. 80, 063701 (2011) [3] K. Matsubayashi, T. Tanaka, A. Sakai et al., Phys. Rev. Letts. 109, 187004 (2012) [4] M. Fu, A. Sakai, N, Sogabe et al., J. Phys. Soc. Jpn. 89, 013704 (2020) [5] A. Sakai, Y. Matsumoto, M. Fu et al., Nat. Commun 16, 2114 (2025)
Speaker Bio: Dr. Mingxuan Fu received her undergraduate degree in Physics from the University of Toronto in 2010 and earned her PhD in Experimental Condensed Matter Physics from McMaster University in 2015. She subsequently held a joint postdoctoral position with Professor Collin Broholm at Johns Hopkins University and the NIST Center for Neutron Research, followed by a NSERC postdoctoral fellowship under Professor Stephen Julian at the University of Toronto (2015–2019). In 2019, Dr. Fu joined the University of Tokyo as a JSPS Fellow and is currently a Project Assistant Professor in the Department of Physics. She is a member of Professor Satoru Nakatsuji’s research group. Her research experiences encompass several central themes in quantum materials, including quantum critical phenomena and exotic superconductivity in strongly correlated electron systems, frustrated quantum magnetism, and topological materials, and her current focus is on multipolar-driven quantum phenomena and functional topological antiferromagnets.
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2025-07-17T10:00:002025-07-17T11:00:00The Strange Universe of Quantum Phases Driven by Interplay between Multipoles and Conduction ElectronsEvent Information:
Multipolar moments embedded in a metallic setting paves a new route to extend the landscape of novel quantum phenomena beyond the spin-only paradigm [1]. A model material platform for exploring multipolar physics is the cubic heavy-fermion system PrTr_2Al_20 (Tr = Ti, V). This system features a nonmagnetic ground state in which the magnetic dipolar moment (spin) is absent, but higher-rank multipolar moments (quadrupoles and octupoles) are active [2]. The Kondo entanglement of these local multipolar moments with conduction electrons results in a rich phase diagram comprising multipolar orders, non-Fermi liquid (NFL) phase, and exotic superconductivity [2-5]. In this talk, I will present our experimental investigation into the multipolar ordered phases multipolar quantum criticality and novel superconductivity in PrTr_2Al_20, which contrast sharply from those in the familiar magnetic settings. References [1] S. Paschen and Q. Si, Nat. Rev. Phys. 3, 9-26 (2021) [2] A. Sakai and S. Nakatsuji, J. Phys. Soc. Jpn. 80, 063701 (2011) [3] K. Matsubayashi, T. Tanaka, A. Sakai et al., Phys. Rev. Letts. 109, 187004 (2012) [4] M. Fu, A. Sakai, N, Sogabe et al., J. Phys. Soc. Jpn. 89, 013704 (2020) [5] A. Sakai, Y. Matsumoto, M. Fu et al., Nat. Commun 16, 2114 (2025)
Speaker Bio: Dr. Mingxuan Fu received her undergraduate degree in Physics from the University of Toronto in 2010 and earned her PhD in Experimental Condensed Matter Physics from McMaster University in 2015. She subsequently held a joint postdoctoral position with Professor Collin Broholm at Johns Hopkins University and the NIST Center for Neutron Research, followed by a NSERC postdoctoral fellowship under Professor Stephen Julian at the University of Toronto (2015–2019). In 2019, Dr. Fu joined the University of Tokyo as a JSPS Fellow and is currently a Project Assistant Professor in the Department of Physics. She is a member of Professor Satoru Nakatsuji’s research group. Her research experiences encompass several central themes in quantum materials, including quantum critical phenomena and exotic superconductivity in strongly correlated electron systems, frustrated quantum magnetism, and topological materials, and her current focus is on multipolar-driven quantum phenomena and functional topological antiferromagnets.Event Location:
BRIM 311