The complex Young's modulus, E, of RuSr2GdCu2O8 was measured for the first time in the temperature range from 1.5 up to 900 K. In the paramagnetic phase the real part of the Young's modulus decreases almost linearly with T, in agreement with the usual quasiharmonic approximation of the lattice dynamics described by the Debye model. A Debye temperature of about 390 K well reproduces the experimental data, in agreement with OD obtained by means of specific heat measurements performed by other authors. However, around the ferromagnetic transition the real part of E is affected by the onset of the magnetic order, slightly decreasing from the expected Debye behavior down to about 90 K, evidencing a magnetoelastic coupling in RuSr2GdCu2O8. On further cooling, E' increases, becoming greater than the value expected from the Debye model. (C) 2003 Elsevier B.V. All rights reserved.
Magnetoelastic coupling in RuSr2GdCu2O8 / A., Paolone; F., Cordero; Cantelli, Rosario; G. A., Costa; C., Artini; A., Vecchione; M., Gombos. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 272:III(2004), pp. 2106-2107. (Intervento presentato al convegno International Conference on Magnetism (ICM 2003) tenutosi a Rome, ITALY nel JUL 27-AUG 01, 2003) [10.1016/j.jmmm.2003.12.874].
Magnetoelastic coupling in RuSr2GdCu2O8
CANTELLI, Rosario;
2004
Abstract
The complex Young's modulus, E, of RuSr2GdCu2O8 was measured for the first time in the temperature range from 1.5 up to 900 K. In the paramagnetic phase the real part of the Young's modulus decreases almost linearly with T, in agreement with the usual quasiharmonic approximation of the lattice dynamics described by the Debye model. A Debye temperature of about 390 K well reproduces the experimental data, in agreement with OD obtained by means of specific heat measurements performed by other authors. However, around the ferromagnetic transition the real part of E is affected by the onset of the magnetic order, slightly decreasing from the expected Debye behavior down to about 90 K, evidencing a magnetoelastic coupling in RuSr2GdCu2O8. On further cooling, E' increases, becoming greater than the value expected from the Debye model. (C) 2003 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
