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 yD 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, E0 increases, becoming greater than the value expected from the Debye model.
Magnetoelastic coupling in RuSr2GdCu2O8
COSTA, GIORGIO;ARTINI, CRISTINA;
2004-01-01
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 yD 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, E0 increases, becoming greater than the value expected from the Debye model.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
