We have elaborately investigated heavily doped Nd1-x Srx Mn O3 with x=0.57-0.75. 3 z2 - r2 and x2 - y2 orbital orders strongly compete with each other at x=0.625. The competition causes spatial orbital fluctuation on nanometer scale below the orbital ordering temperature (TOO ∼500 K), which is evidenced by the observation of tweed structure using transmission electron microscopy. The orbital fluctuation, which persists down to lowest temperatures, gives rise to anomalous ferromagnetic behavior and concomitant large magnetoresistance well below the Néel temperature (TN =220 K).
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2008 2 4|
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