Abstract
Based on the results of field-dependent dielectric and magnetic measurements, we observe several interesting behaviors and phase transitions in this geometrically frustrated spinel system CdCr2 S4. (1) A glassy dipolar state occurs near TC ∼85K, which is induced by the onset of ferromagnetic ordering. (2) A ferroelectric ordering occurs near Tp ∼56K, which is enhanced by externally applying electric field. (3) Both the magnitude and step-up temperature of dielectric constant (ε′) near TC are suppressed by an electric field yet are increased by the magnetic field. (4) Both electric and magnetic fields colossally enhance the magnitude of dielectric constant (ε′) near Tp. (5) A clear dip of magnetization under various electric fields is observed near Tp indicating the different spin-dipole interactions near TC and Tp. Attempts are made to analyze these field-dependent properties by considering the strong spin-lattice coupling and exchange striction effect in this novel multiferroic material.
| Original language | English |
|---|---|
| Article number | 214116 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 79 |
| Issue number | 21 |
| DOIs | |
| State | Published - 25 06 2009 |
| Externally published | Yes |