Heat capacity and N. M. R. study of the NH₄MgF₃ perovskite

E. Palacios Dpto. de Física E. T. S. I. I., Kamerlingh Onnes Lab., Leiden

J. Bartolomé Dpto. de Termología, Kamerlingh Onnes Lab., Leiden

R. Navarro Dpto. de Física E. T. S. I. I., Kamerlingh Onnes Lab., Leiden

J. Garcia Dpto. de Física E. T. S. I. I., Kamerlingh Onnes Lab., Leiden; Dpto. de Termología, Kamerlingh Onnes Lab., Leiden; Facultad de Ciencias. U. de Zaragoza, Kamerlingh Onnes Lab., Leiden

D. González Dpto. de Física E. T. S. I. I., Kamerlingh Onnes Lab., Leiden; Dpto. de Termología, Kamerlingh Onnes Lab., Leiden; Facultad de Ciencias. U. de Zaragoza, Kamerlingh Onnes Lab., Leiden

H. B. Brom Facultad de Ciencias. U. de Zaragoza, Kamerlingh Onnes Lab., Leiden

Abstract

The NH₄MgF₃ perovskite undergoes a structural and reorientational phase transition at Tc=107. 5±0. 1 K. The librational motion of the NH⁺ ₄ ion below Tc is hindered by a barrier producing an activation energy of Ea/k = 850 K, and correlation time of c=50 fs, as found in N. M. R. measurements. Tunnelling in the ground state multiplet is detected as well.

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Heat capacity and N. M. R. study of the NH₄MgF₃ perovskite