Abstract
The structural and physical properties of the Ruddlesden–Popper phases La 1.4Sr 1.6− x A x Mn 2O 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 La 1.4Sr 1.6Mn 2O 7, the samples substituted by Ca and Ba exhibit reduced magnetic moments and conductivity. There is also a growing spin-glass like character with substitution. These can be explained by suppressed ferromagnetic double exchange interactions that result from local distortions by the size mismatch among La, Sr, and Ca/Ba.
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