CeFePO:: A heavy fermion metal with ferromagnetic correlations

被引：93

作者：

Bruening, E. M. ^{[1
]}

Krellner, C. ^{[1
]}

Baenitz, M. ^{[1
]}

Jesche, A. ^{[1
]}

Steglich, F. ^{[1
]}

Geibel, C. ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.101.117206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ground state properties of CeFePO, a homologue of the new high temperature superconductors RFePnO(1-x)F(x), were studied by means of susceptibility, specific heat, resistivity, and NMR measurements on polycrystals. All the results demonstrate that this compound is a magnetically nonordered heavy fermion metal with a Kondo temperature T(K) similar to 10 K, a Sommerfeld coefficient gamma = 700 mJ/mol K(2), and a mass enhancement factor of the order of 50. Analysis of the susceptibility data and of the spin relaxation time indicates that the strong electronic correlation effects originate from the Ce-4f electrons rather than from Fe-3d electrons. An enhanced Sommerfeld-Wilson ratio R = 5.5 as well as a Korringa product S(0)/T(1)TK(2) similar or equal to 0.065 well below 1 indicate the presence of ferromagnetic correlations. Therefore, CeFePO appears to be on the nonmagnetic side of a ferromagnetic instability.

引用

页数：4

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