Powder EPR study of the Jahn-Teller effect and phase transition in Cu2+:ZnTiF6·6H20
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The American Physical Society
Abstract
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A powder electron-paramagnetic-resonance study of Cu2+ in ZnTiF6·6H20 has been made at 35
GHz in the range 4.2-300 K. The low-temperature structure has been related to four single-crystal
Jahn-Teller transitions. The single-line spectrum at high temperature was replaced gradually by a
multiline spectrum at temperatures below 165 K, i.e., about 6 K below the single-crystal transition
temperature for 0.043 at. % Cu2+ concentration. The exponential line broadening with temperature
in the high-temperature region (above phase transition) was fitted to an Orbach process, with an excited
state at 1350 cm-1• A Jahn-Teller stabilization energy Err= 1000 cm-1 may be obtained from
this fit. The relaxation rate 1/T1 is deduced and compared with that for
Cu2+ :La3Mg2(N03l12· 24H20
Keywords
Q Science (General), QC Physics