Giant anisotropic magnetostriction in Pr[sub 0.5]Sr[sub 0.5]MnO[sub 3]

Mahendiran, R.; R. Ibarra, M.; Marquina, C.; Garcia-Landa, B.; Morellon, L.; Maignan, A.; Raveau, B.; Arulraj, A.; Rao, C. N. R.
January 2003
Applied Physics Letters;1/13/2003, Vol. 82 Issue 2, p242
Academic Journal
We show that the polycrystalline perovskite antiferromagnet Pr[sub 0.5]Sr[sub 0.5]MnO[sub 3] exhibits a giant anisotropic magnetostriction (λ[sub t] = 1.5 × 10[sup -3] at T= 25 K and H = 14.2 T) contrary to much smaller λ[sub t] (<0.1 × 10[sup -3]) found in most other three-dimensional manganites. The value of λ[sub t] decreases rapidly as the Néel temperature is approached from below, but an unusually high value of λ[sub t] is also found below the ferromagnetic Curie temperature. We suggest that the magnetic-field-induced antiferromagnetic-to-ferromagnetic transition is accompanied by a structural transition from orthorhombic to tetragonal symmetry and attribute the giant anisotropic effect to the preferential growth of the orbital disordered tetragonal (ferromagnetic) domains along the field direction in the e[sub g]-d[sub x[sup 2]- y[sub 2] orbital ordered orthorhombic (antiferromagnetic) matrix.


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