日程 : 2025年5月27日(火) 9:30 - 10:30
場所 : オンライン（Zoom）
講師 : Dr. Minseong Lee
所属 : National High Magnetic Field Laboratory
主催 : 強磁場コラボラトリー
世話人 : 小濱 芳允
e-mail :ykohama@g.ecc.u-tokyo.ac.jp
The Kitaev quantum spin liquid is a highly entangled state with fractionalized excitations—Majorana fermions—that are promising for fault-tolerant quantum computing. Honeycomb cobaltites are proposed to realize Kitaev-type exchange interactions due to a distinct hierarchy among crystal electric field effects, spin-orbit coupling, and lattice geometry. However, whether these materials truly support significant Kitaev interactions remains under debate. In this talk, I will present an approach using high-field torque magnetometry to probe magnetic anisotropy as a signature of these interactions. By scaling the torque data, we can uncover the microscopic origin of the anisotropy. To measure torque in bulk samples, capacitive torque magnetometry is preferred. As a first step toward this, I will also present a method for implementing capacitance measurements in pulsed magnetic fields.