期刊
NANO LETTERS
卷 14, 期 9, 页码 5016-5020出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl501436w
关键词
Thermoelectric; heavy Fermions; Kondo lattice; boundary scattering; YbAgCu4
类别
资金
- Air Force Office of Scientific Research's MURI program [FA9550-10-1-0533]
We have studied the thermoelectric properties of nanostructured YbAgCu4 materials. A high power factor of similar to 131 mu W cm(-1) K-2 has been obtained at 22 K for nanostructured samples prepared by ball milling the arc melted ingot into nanopowder and hot pressing the nanopowder. The implementation of nanostructuring method decreased the thermal conductivity at 42 K by 30-50% through boundary scattering comparing with the previously reported value of polycrystalline YbAgCu4. A peak dimensionless thermoelectric figure-of-merit, ZT, of 0.11 has been achieved at 42 K, which may find potential applications for cryogenic cooling below 77 K. The nanostructuring approach can be extended to other heavy Fermion materials to achieve high power factor and low thermal conductivity and ultimately higher ZT.
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