Am. Venter et Pd. Duplessis, ULTRASONIC OBSERVATION OF THE 5 18 LOCK-IN IN HOLMIUM/, Journal of magnetism and magnetic materials, 144, 1995, pp. 757-758
The elastic constant C-33 and attenuation coefficient alpha(33) of Ho
measured in b-axis directed applied fields indicate marked anomalies w
hich correlate with the temperature extent of the lock-in al wave vect
or tau = 5/18 c as observed with neutron diffraction. A phase diagram
is presented.