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The nature of orbital order-disorder transition has been studied in theLa(1-x)Nd(x)MnO(3) (x = 0.0-1.0) series which covers the entire range betweentwo end points - LaMnO(3) and NdMnO(3) - as well as inLa(0.85)Nd(0.1)Sr(0.05)MnO(3) and La(0.8)Nd(0.1)Sr(0.1)MnO(3). It has beenobserved that the first-order nature of the transition gives way to higherorder with the increase in "x" in the case of pure manganites. The latent heat(L) associated with the transition, first, drops with a steeper slope within x= 0.0-0.3 and, then, gradually over a range 0.3<x<0.9. This drop could,possibly, be due to evolution of finer orbital domain structure with "x". Inthe case of Sr-doped samples, the transition appears to be of higher-ordernature even for a doping level 5 at%. In both cases, of course, the transitiontemperature T(JT) rises systematically with the drop in average A-site radius<r(A)> or rise in average Mn-O-Mn bond bending angle <cos^2(phi)> while noapparent correlation could be observed with doping induced disorder sigma^2.The cooperative nature of the orbital order, therefore, appears to be robust.Comment: 15 pages including 4 figures; pdf onl

physical review. b, condensed matter and materials physics

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Orbital order-disorder transition inLa1−xNdxMnO3