Orbital domain state and finite size scaling in ferromagnetic insulating manganites

Abstract

55Mn and 139La NMR measurements on a high quality single crystal of ferromagnetic (FM) La0.80Ca20MnO3 demonstrate the formation of localized Mn(3+,4+) states below 70 K, accompanied with strong anomalous increase of certain FM neutron Bragg peaks. (55,139)(1/T1) spin-lattice relaxation rates diverge on approaching this temperature from below, signalling a genuine phase transition at T(tr) approx. 70 K. The increased local magnetic anisotropy of the low temperature phase, the cooling-rate dependence of the Bragg peaks, and the observed finite size scaling of T(tr) with Ca (hole) doping, are suggestive of freezing into an orbital domain state, precursor to a phase transition into an inhomogeneous orbitally ordered state embodying hole-rich walls.

4 pages, 4 figures

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• Phase diagram and magnetic properties of La${}_{1-x}$Ca${}_x$MnO${}_3$ compound for $0\le x\le 0.23$
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• Nonequilibrium 1/f Noise in Low-doped Manganite Single Crystals
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• Domain Formation and Orbital Ordering Transition in a Doped Jahn-Teller Insulator
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• Non-Gaussian resistance noise in the ferromagnetic insulating state of a hole doped manganite
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• Metastable Resistivity States and Conductivity Fluctuations in Low-doped La${}_{1-x}$Ca${}_x$MnO${}_3$ Manganite Single Crystals
• The Effect of Disorder in an Orbitally Ordered Jahn-Teller Insulator
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