88Poster Award NomineeP5-15Physical Properties of Quantum Materials under Low Temperature and High Magnetic Field Naoki KikugawaCenter for Basic Research on Materials, National Institute for Materials Science (NIMS) [1] N. Smith, Nature Materials, 16, 1068 (2017). [2] Y. Ando, J. Phys. Soc. Jpn., 82, 102001 (2013). [3] B.A. Bernevig, C. Felser, and H. Beidenkopf, Nature, 603, 41 (2022). [4] N. Kikugawa, Crystals, 14, 552 (2024). P5-16Observation of Nematicity in the Normal State in Sr-doped Bi2Se3 Yuhang Zu, Wenxi Wu, Tsuyoshi Tamegai and Yukio Hasegawa School of Engineering, The University of Tokyo Quantum materials have attracted great attention as next-generation functional materials due to their rich physical properties, such as novel magnetism, multiferroicity, and unconventional superconductivity [1]. Recent advances in topological materials have also opened new windows to deepen our knowledge of the underlying materials science [2,3]. A key aspect of these materials is that their ground states can be controllable by relatively small perturbations: chemical substituting or doping of other elements, (uniaxial) pressure, gate tuning, and magnetic field. Understanding the intrinsic properties of bulk materials is essential because the magnetic, electronic, thermal, and topological properties are strongly linked. We present our recent achievements on the physical properties of quantum materials under low temperatures and high magnetic fields, where the bulk single-crystalline materials are grown by a floating-zone method [4]. We particularly focus on the magnetocaloric effect, a candidate magnetic Weyl semimetal, and unconventional superconductivity. Research on nematicity has been an important topic in the research field of unconventional superconductors. Nematicity means physics quantities show C2 symmetry with high symmetry Cn in the crystal lattice. In previous work, such symmetry-broken electronic nematic phase widely found in high- Tc cuprates, iron-based superconductors and kagome superconductors. Recently, a similarly symmetry-broken behavior below Tc was found in topological superconductors AxBi2Se3 (A=Cu, Sr, Nb), which is named nematic superconductivity. In theory and some experiments indicate that nematic superconductivity can be observed over Tc, but is limited to a small range above Tc. In this work, by carefully remove Planar Hall effect signal, we successfully got the numericity signal even in high temperature range (~200 K). Such result will have a huge influence on the understanding the mechanism of nematic superconductivity.
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