Dipolar fields in a low-dimensional paramagnet: Cu(L-leucine)2

A. FAINSTEIN

JOURNAL OF PHYSICS CONDENSED MATTER

IOP PUBLISHING LTD

Año: 1992 vol. 4 p. 4989 - 4996

0953-8984

A strong temperature variation in the gyromagnetic factor of the electron paramagnetic resonance line of bis(L-leucinato) copper (II) has been observed in single-crystal samples between 2 and 300 K. In order to characterize the magnetic properties and to evaluate the importance of short-range order effects the author has also measured the magnetic susceptibility on powder samples. The data on the g-shift are interpreted as the combined effect of the dipole-dipole interaction between copper ions, and the spin polarization induced by the applied magnetic field when the temperature is lowered. The layered distribution of the Cu ions in the crystal lattice makes this effect non-negligible and determines the quasi-two-dimensional behaviour of the shift.