Abstract
The two pyrochlore titanates Dy2 Ti2 O7 and Tb2 Ti2 O7 have low temperature magnetic states that result from geometrical frustration of the spin-spin interactions between neighboring rare-earth ions. Dy2 Ti2 O7 is a canonical spin ice material, while the Tb moments in Tb2 Ti2 O7 have a liquidlike cooperative paramagnetic state at low temperatures. We report magnetic and thermal properties of the hybrid rare-earth titanates, Dy2-x Tbx Ti2 O7, with 0≤x≤2. We find that both the magnetic and thermal properties of the materials are strongly affected by the mixture of the ions on the sites, and that the ground state of Dy2-x Tbx Ti2 O7 is different from both spin ice and spin liquid, i.e., Dy2-x Tbx Ti2 O7 is not a simple mixture of spin ice and spin liquid components or the corresponding nonmagnetic diluted species. The strongly altered low temperature behavior is presumably associated with the Dy-Tb spin interactions and the altered crystalline electric field, suggesting that such hybrid frustrated materials offer an alternative avenue through which to explore geometrical magnetic frustration.
Original language | English (US) |
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Article number | 144426 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 80 |
Issue number | 14 |
DOIs | |
State | Published - Oct 29 2009 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics