Abstract
Antiferroquadrupolar (AFQ) and magnetic transitions in Dy1-xYxB2C2 (0 ≤ x ≤ 0.6) have been investigated on the single-crystalline samples by magnetization and specific heat measurements. As the Y concentration increases, the magnetic transition temperature decreases from 15.3 K at x = 0 to 4.5 K at x = 0.6. The AFQ transition temperature also decreases from 24.7 K at x = 0 to 7.4 K at x = 0.6, although it becomes unclear for x ≥ 0.5 in the magnetization. A λ-type peak of specific heat at TQ becomes broader as x increases, and changess to a small upheaval for x ≥ 0.5. On the other hand, the field-induced transitions at the boundary between the AFQ and paramagnetic phases are clearly observed in the magnetization processes at 1.5 K x ≤ 0.6. The behavior of specific heat implies that the AFQ interaction acts strongly in a rather shorter distance than the antiferromagnetic interaction in DyB2C2. The Y dilution causes in a wide distribution of the AFQ interaction strength acting on the Dy quadrupoles. Then the AFQ order developes in a wide temperature range, and is almost completed above the magnetic transition temperature.
Original language | English |
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Pages (from-to) | 1872-1879 |
Number of pages | 8 |
Journal | journal of the physical society of japan |
Volume | 69 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2000 Jun |
Keywords
- Antiferromagnetic order
- Antiferroquadrupolar order
- DyBC
- Magnetic anisotropy
- Magnetic susceptibility
- Specific heat
- Spontaneous magnetization
- Transition temperature
- Y dilution
ASJC Scopus subject areas
- Physics and Astronomy(all)