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Thermoelectric properties of Ce(Ni, Pd)2Ge2 at low temperatures below 1 K

✍ Scribed by T. Kuwai; P. Sun; T. Sugihara; H. Suzuki; M. Takeuchi; T. Mizushima; A. Mitsuda; Y. Isikawa; T. Fukuhara

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
217 KB
Volume
378-380
Category
Article
ISSN
0921-4526

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✦ Synopsis

Thermoelectric power S of single crystals for a nonmagnetic heavy fermion compound CeNi 2 Ge 2 and for the alloys of Ce(Ni 1Γ€x Pd x ) 2 Ge 2 was investigated well below 1 K. S/T, S divided by temperature T, logarithmically increases with lowering temperature below 10 K, approaching a large magnitude of about 10 mV/K 2 in the lowest temperatures along the c-axis of a tetragonal crystal structure for the sample with x ΒΌ 0.06. This behavior strikingly coincides with the temperature dependence of C/T which leads to a large Sommerfeld coefficient g of 630 mJ/K 2 mol in the zero-temperature limit. On the other hand, S/T for CeNi 2 Ge 2 shows a complex temperature dependence at low temperatures in both axes, and is different from its C/T behavior. These results are regarded as the consequence originating from a non-Fermi-liquid nature evolved at low temperatures in the vicinity of the antiferromagnetic quantum critical point.

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