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We report on high-temperature electron spin resonance studies of a detwinnedLaMnO$_3$ single crystal across the Jahn-Teller transition at $T_{\rm JT}$ =750 K. The anisotropy of the linewidth and g-factor reflects the localJahn-Teller distortions in the orbitally ordered phase. A clear jump in thelinewidth accompanies the Jahn-Teller transition at $T_{\rm JT}$ = 750 Kconfirming that the transition is of first order. Already at $T^*$ = 550 K asignificant decrease of the reduced linewidth is observed. This temperaturescale is discussed with respect to the interaction of the $e_g$-electrons ofthe Mn$^{3+}$-ions and the elastic field of the cooperative distortions. Ourresults support a partial melting of the orbital order along theantiferromagnetically coupled $b$-axis at $T^*$. The remaining two-dimensionalorbital ordering within the ferromagnetically coupled $ac$-plane finallydisappears together with the cooperative distortion at $T_{\rm JT}$. Moreoverin our discussion we show that elastic strain field interactions can explainthe melting of the orbital order and, thus, has to be taken into account toexplain the orbital ordering in LaMnO$_3$.

ESR evidence for partial melting of the orbital order in LaMnO$_3$ below the Jahn-Teller transition