THz-ESRによる磁気励起の研究 テラヘルツ光は光と電波の中間の周波数をもつ電磁波であり、そのエネルギーは磁気励起をはじめとした様々な物質中の素励起やダイナミックスのエネルギーに相当します。 テラヘルツESRは、従来のESRに比べて格段に高分解能で、大きなゼロ磁場分裂や速い緩和をもつ磁性イオンへの応用が可能なため電子スピンのダイナミックス研究の有力な手段です。 1 THzでは電子スピンの共鳴磁場は約40 テスラにも達し、パルス超強磁場との組み合わせが必要となります。 THz-ESR Study on Magentic Excitations THz wave is located between electromagnetic wave and photon regimes. Many of excitations in matters such as magnetic excitation, phonon and etc. are in the THz energy range. THz ESR is extremely high resolution compared to conventional microwave ESR and is powerful to capture the signals of fast relaxing magnetic ions and of large zero field splitting. The energy of 1 THz wave is equivalent to the Zeeman energy at 40 T and thus use of pulse magnetic fields is essential for THz-ESR. For More Insight Pressure-tuning the Quantum Spin Hamiltonian of the Triangular Lattice Aantiferromagnet Cs2CuCl4, Nature Comm. 10 (2019)10643 Chemical Trend on the Lanthanide-Radical Exchange Coupling, Polyhedron 136 (2017) 149 Chemical Trend on the Lanthanide-Radical Exchange Coupling, Polyhedron 136 (2017) 149 Terahertz Cyclotron Resonance Spectroscopy of an AlGaN/GaN Heterostructure Using a High-Field Pulsed Magnet and an Asynchronous Optical Sampling Technique, Appl. Phys. Lett. 108(2016) 212101 Rapid Scanning Terahertz Time-Domain Magnetospectroscopy with a Table-Top Repetitive Pulsed Magnet, Applied Optics 53, 5850 (2014) Magnetization Process and Collective Excitations in the S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9, Phys. Rev. Lett. 110, 267201, 2013 Multiferroic FeTe2O5Br: Alternating Spin Chains with Frustrated Interchain Interactions, Phys. Rev. B 86(2012) 054402 Intrinsic Magnetoresistance of Single-Walled Carbon Nanotubes Probed by a Noncontact Method, Phys. Rev. Lett. 104(2010) 016803 Magnetic Excitation of S = 1/2 Antiferromagnetic Spin Chain Cu Benzoate in High Magnetic Fields, New J. of Phys. 8 (2006) 218 ESR Study on the Excited State Energy Spectrum of SrCu2(BO3)2 - A Central Role of Multiple-Triplet Bound States, J. Phys. Soc. Jpn. 72(2003)3243 Copyright (C)2013 nlab All Rights Reserved.