Abstract
The electrical resistivity ρ and thermopower S of metallic ferromagnets CuCr2X4 (X=S,Se or Te) are measured at low temperatures and in an external magnetic field of 1.5 Tesla. These properties are dominated by strong scattering effects in their ferromagnetic phase, resulting in (a) ρ(T) ∼A T2dependence with very large value of coefficient A ≈ 1 - 3×10-8 Ω-cm/K2 in resistivity and (b) a peak in the thermopower around TC/3 . Thermopower is further increased by crystalline order and by the alignment of magnetic domains in an external magnetic field as has been found for Cu1+x Cr 2Te4. We have interpreted these effects as due to strongly coherent momentum conserving electron-magnon scattering giving a large T 2 - contribution in resistivity and a large drag effect in thermopower.
Original language | English |
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Article number | 032060 |
Journal | Journal of Physics: Conference Series |
Volume | 200 |
Issue number | SECTION 3 |
DOIs | |
Publication status | Published - 1 Jan 2010 |
MoE publication type | A4 Conference publication |
Keywords
- Magnon drag
- Phonon drag
- Spinels
- Thermopower