講演情報
[7p-N105-1]Control of thermal conductivity using UV-light and magnon conduction in Ca9La5Cu24O41 single crystal
〇(D)Peyman Lotfalinezhad1, Masaharu Matsunami1, Tsunehiro Takeuchi1 (1.Toyota Tech. Inst.)
キーワード：
Heat flow switching、Magnon disruption、UV light excitation
This study focuses on the use of Ca9La5Cu24O41, a material with one-dimensional antiferromagnetic spin ladder structures, for heat flow switching in modern electronics. This material exhibits high thermal conductivity along the ladder direction (~100 Wm-1K-1) and low conductivity perpendicular to it (~2 Wm-1K-1). The anisotropic heat transfer is attributed to magnons, which are magnetic excitations that can be disrupted to manipulate heat flow, making this material ideal for heat flow switching applications. A single crystal of Ca9La5Cu24O41 was synthesized using the traveling solvent floating zone (TSFZ) method. Its thermal conductivity was measured using both the periodic heating and relaxation methods to assess its properties accurately. The primary mechanism for switching heat flow involved using UV light to disrupt magnons by exciting the Cu 3d electrons in the material with a 365 nm wavelength light. This excitation significantly reduced the thermal conductivity along the spin ladder direction by a factor of 3.6 when measured at room temperature.