Electron Spin Resonance of Exchange-Coupled Inequivalent Spins at Low Temperatures and High Fields : H/T Effect in 'Exchange Splitting'

概要

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Submillimeter ESR of (NH.)zCuC1.'2H.O (Cl-salt), (NH.).CuBr.-2H.0 (Br-salt),CuCl.'2H.O and Cu(NH,).SO.?2HzO (CTS) has been measured down to liquidhelium temperature region by the apparatus using 337 prn wave of HCN Baser andpulsed high magnetic fields up to 500 k0e. Each salt contains exchange-coupled ine-quivalent spin sites and so-called exchange splitting has been observed at room tem-perature. At liquid helium temperatures intensities of the two split lines are quitedifferent and weaker line has shown a remarkable shift in Cl-salt, CuC1,-2H.O andCTS. In Br-salt only single line has been observed. These phenomena can be suc-cessfully explained by the molecular field theory. lnequivalent spins in CTS have beendeduced by the theory' to be anitiferromagnetically coupled while the coupling in Cl-,Br-salts and CuCl,?2H.0 are ferromagnetic.[ submillimeter ESR, high magnetic fields, exchange splitting, H/T effect, ][ molecular field theory, exchange coupling constantt
社団法人日本物理学会の論文
1992-03-15