Abstract
A new ultrasonic sing-around system has been used to measure the changes in the elastic moduli of single-crystal specimens of erbium to a much higher precision than has been achieved previously. The variations of the second-order elastic constants C33, C11, C44 and C66 have been measured as a function of temperature over the range 4.2-100K. The variations of the moduli C11 and C33 have also been investigated as a function of magnetic field applied along the c and b crystallographic axes respectively at a series of temperatures in the three magnetically ordered phases of erbium. The results have allowed critical magnetic fields and their dependence upon temperature to be determined.
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