1 research outputs found
Observation of the cubic-field splitting of an excited S = 2 manifold in a cubic copper tetramer
EPR measurements on single crystals of Cu40Cl6(triphenylphosphine oxide)4 at liquid helium
temperatures in the frequency ranges 14-17 and 34-35 GHz were fitted to a simple cubicS= 2
spin Hamiltonian with g = 2.10 ± 0.01 and a zero-field splitting of(0.53 ± 0.01) em - 1
• From the
decrease in intensity of the S = 2 spectrum on cooling below 4.2 K and the absence of an S = 1
spectrum, the S = 2 manifold was deduced to lie ( 14 ± 1) em- 1 above a nonmagnetic ground
state. The EPR results are used as a test of the various theories developed to explain the magnetic
susceptibility of copper tetramer