Anomalies of Elastic Properties at Phase Transitions in Rare Earth Cobaltites RBaCo4O7 (R = Y, Er - Lu)

Z.A. Kazei; V.V. Snegirev; L.P. Kozeeva; M.Yu. Kameneva

doi:10.4028/www.scientific.net/SSP.190.482

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Anomalies of Elastic Properties at Phase Transitions in Rare Earth Cobaltites RBaCo₄O₇ (R = Y, Er - Lu)

Abstract:

Elastic properties of rare-earth cobaltites RBaCo₄O₇ (R = Y, Er - Lu) are studied in the temperature range (4.2 - 300) K. Significant softening of Youngs modulus for Lu-and Yb-cobaltites is found at temperature decrease, showing an instability of the crystal structure and accompanying by a reverse jump at the structural phase transition. Softening and jump at phase transition decrease more than by the order of value, while the transition temperature T_s and hysteresis dT_s enlarge from Lu-to Tm-and Er-compounds. Smooth and weak elastic anomaly at the magnetic phase transition is found resulting from low dimension and frustration of exchange interactions in the Co subsystem in most of the rare-earth cobaltites studied.