N Mufti et al 2009 J. Phys.: Condens. Matter 21 452203 doi:10.1088/0953-8984/21/45/452203
N Mufti1,3, G R Blake1, A A Nugroho1,2 and T T M Palstra1
Show affiliationsThe influence of magnetic field on the electrical properties of Tb1−xCaxMnO3 has been investigated by means of dielectric, polarization and neutron diffraction measurements. A field of 6 T applied along the b-axis induces a crossover from ferroelectric to relaxor behavior for the x = 0.02 compound at temperatures close to the ferroelectric transition. The mechanism of this field induced crossover involves a decrease in the coherence length of the Mn-spin-spiral structure due to increasing electron hopping rates associated with double exchange. Moreover, a large negative magnetocapacitance is observed at the freezing temperature for x = 0.05, which originates from suppression of the relaxor state and thus represents a new mechanism of magnetocapacitance.
77.22.Ej Polarization and depolarization
75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction
Issue 45 (11 November 2009)
Received 23 September 2009
Published 21 October 2009
N Mufti et al 2009 J. Phys.: Condens. Matter 21 452203
S A Suchkova et al 2009 J. Phys.: Conf. Ser. 190 012137
Mustapha Hamdi 2009 Nanotechnology 20 485501
G Shu et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 154005
N R Bernardino et al 2009 J. Phys.: Condens. Matter 21 465105
Benjamin Bahr and Bianca Dittrich 2009 Class. Quantum Grav. 26 225011
A Berko et al 2009 J. Phys.: Conf. Ser. 190 012147
N Binsted and A Bryan Edwards 2009 J. Phys.: Conf. Ser. 190 012071
J J Rehr et al 2009 J. Phys.: Conf. Ser. 190 012001
Wei Lin et al 2009 Nanotechnology 20 485204