Effect of Strain on the Sinusoidal Spin Arrangement

抄録

To find a mechanism of stabilising the period of seven layers in the sinusoidal spin arrangement of Tm and Er, the contribution of the oscillating strain associated with the spin arrangement to the free energy is calculated. It is shown that this strain is effective below a certain temperature to stabilize the period of seven, as far as the period of the spin arrangement in the neighborhood of the Néel temperature is close to seven.