Abstract
Colwell and Mangum1 have observed a sharp peak in the specific heat of PrCl3 near 0.4°K which they interpreted as a transition to an AF state. We have observed the 35Cl nuclear quadrupole resonance line2 at 4.567 MHz to split below this temperature into two lines. The behavior in a small magnetic field is consistent with an Ising AF with the magnetic moment along the C3 direction, and implies a symmetry of P2c3̄ (antiferromagnetic chains). At the lowest temperature reached, 0.31°K, the splitting is 80 kHz. The projection of the local field at the Cl site on the xy plane of the principle axis system of the electrostatic field gradient is approximately along the bisection of y and z. The angle between the local field and x, C3, is approximately 30°. The magnitude of local field is about 500 G for a splitting of 80 kHz. Lineshape changes in the short range ordering region above TN are observed.
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