Abstract
The interplay of spin, charge and lattice degrees of freedom inLaSr2Mn2O7 (tetragonal,space group I4/mmm) yields a variety of properties such as a CE-type charge ordering and an A-typespin ordering. We have studied the effect of partial replacement of La by Pr onthe magnetic and thermal properties of this system. Compounds of the typeLa1−xPrxSr2Mn2O7 (0≤x≤1) have been prepared and are found to crystallize in the same tetragonal structure.Magnetization, electrical resistivity and specific heat measurements have beencarried out on these compounds. Replacing La by Pr in this system affectsboth the electronic and the magnetic state of the system. It is observed thatthe charge ordering temperature and the net magnetic moment reduce with theincorporation of Pr in the lattice. In the antiferromagnetic state, the charge carriers inLa1−xPrxSr2Mn2O7 behave like a weakly scattered two-dimensional gas whose resistivity(ρ) is a logarithmicfunction of temperature, T (), over a certain temperature interval. This behaviour is enhanced with increasingconcentration of Pr in the samples and is proposed to originate from quantum interference.The electronic part of the specific heat shows the presence of the two transitions atTCO and TN and a contribution from antiferromagnetic magnons at low temperatures.
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