Eo. Chi et al., Lattice effects on the magnetic and transport properties in La(1.4)Sr(1.6-x)A(x)Mn(2)O(7) (A = Ca, Ba), SOL ST COMM, 110(10), 1999, pp. 569-574
The structural and physical properties of the Ruddlesden-Popper phases La(1
.4)Sr(1.6-x)A(x)Mn(2)O(7) (A = Ca, Ba) were studied. Single phase compounds
were obtained up to x = 0.4 for Ca and x = 0.3 for Ba, respectively. Their
magnetic and transport behavior is largely dependent upon the size of the
A cations. By comparison with the magnetic and transport properties of the
parent compound La1.4Sr1.6Mn2O7, the samples substituted by Ca and Ba exhib
it reduced magnetic moments and conductivity. There is also a growing spin-
glass like character with substitution. These can be explained by suppresse
d ferromagnetic double exchange interactions that result from local distort
ions by the size mismatch among La, Sr, and Ca/Ba. (C) 1999 Elsevier Scienc
e Ltd. All rights reserved.