Hybridization gap in heavy fermion compounds

Physical Review Letters

Volumn 86, Issue 4, 2001, Pages 684-687

  Dordevic, S V ^a   Basov, D N ^a   Dilley, N R ^a   Bauer, E D ^a   Maple, M B ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CERIUM ALLOYS; ELECTRIC CONDUCTIVITY MEASUREMENT; ELECTRON TRANSPORT PROPERTIES; ELECTRONIC STRUCTURE; ENERGY GAP; FERMI SURFACE; FERMIONS; GROUND STATE; INFRARED SPECTROSCOPY; INTERMETALLICS; MAGNETIC SUSCEPTIBILITY; MAGNETIC VARIABLES MEASUREMENT;

HEAVY FERMION COMPOUND; HYBRIDIZATION GAP; QUASIPARTICLES EFFECTIVE MASS;

YTTERBIUM ALLOYS;

EID: 0035137193     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.86.684     Document Type: Article

References (37)

1. L. Degiorgi, Rev. Mod. Phys. 71, 687 (1999).
2. P. Wachter, in Handbook on the Physics and Chemistry of Rare Earths, edited by K. A. Gschneidner and LeRoy Eyring (Elsevier Science, Amsterdam, New York, 1994), Vol. 19.
3. A. Amato, Rev. Mod. Phys. 69, 1119 (1997).
4. S. Doniach, Physica (Amsterdam) 91B, 231 (1977).
5. A. J. Millis et al., Phys. Rev. B 35, 3394 (1987): A. J. Millis et al., ibid. 36, 864 (1987).
6. A. J. Millis et al., Phys. Rev. B 35, 3394 (1987): A. J. Millis et al., ibid. 36, 864 (1987).
7. A. Georges et al., Rev. Mod. Phys. 68, 13 (1996).
8. P. Fulde, Electron Correlations in Molecules and Solids (Springer-Verlag, Berlin, 1993), 2nd ed.
9. A. C. Hewson, The Kondo Problem to Heavy Fermions (Cambridge University Press, Cambridge, 1997).
10. P. Coleman, Phys. Rev. Lett. 59, 1026 (1987).
11. dc is strongly suppressed and in many HF systems varies quadratically with T. This latter behavior is often referred to as the "coherent regime". The coherence temperature can be determined (inset in Fig. 2) either as a point where the resistivity suddenly drops or as a peak in the first derivative of resistivity (inflection point).
12. A. M. Awasthi et al., Phys. Rev. B 48, 10 692 (1993).
13. L. Degiorgi et al., Z. Phys. B 102, 367 (1997).
14. D. A. Bonn et al., Phys. Rev. Lett. 61, 1305 (1988).
15. S. Donovan et al., Phys. Rev. Lett. 79, 1401 (1997).
16. P. E. Sulewski et al., Phys. Rev. B 38, 5338 (1988).
17. N. R. Dilley et al., Phys. Rev. B 58, 6287 (1998).
18. N. Takeda et al., Physica (Amsterdam) 259B-261B, 92 (1999).
19. 12 "cage" is primarily covalent, similar to Zintl phases (Ref. [19]). However, previous studies have shown that physical and chemical properties of filled skutterudites are in large part determined by the filling atom M, which has been shown to be loosely bonded to the cubic cages in the skutterudites' structure. Heavy fermion behavior has been found only in those members of the family which have rare earths as their filling atoms.
20. Chemistry, Structure and Bonding of Zintl Phases and Ions, edited by S. M. Kauzlarich. (VCH Publisher, Inc., New York, 1996).
21. N. R. Dilley et al., Phys. Rev. B 61, 4608 (2000).
22. S. Dordevic et al., Phys. Rev. B 60, 11 321 (1999).
23. Z. Schlesinger et al., Phys. Rev. Lett. 71, 1748 (1993).
24. B. Bucher et al., Phys. Rev. Lett. 72, 522 (1994).
25. b, can be determined by taking a ratio of the spectral weight of the narrow Drude component to the total intraband spectral weight at T > T*, as discussed in detail in Ref. [1], Section IIE2.
26. P. A. Lee et al., Comments Condens. Matter Phys. 12, 99 (1986).
27. M. J. Rozenberg, G. Kotliar, and H. Kajueter, Phys. Rev. B 54, 8452 (1996).
28. M. Jarrell, Phys. Rev. B 51, 7429 (1995).
29. M. Tinkham, Introduction to Superconductivity (McGraw-Hill, New York, 1996), 2nd ed.
30. T. Portengen et al., Phys. Rev. Lett. 76, 3384 (1996).
31. F. Marabelli et al., Phys. Rev. B 42, 3307 (1990).
32. S. Bocelli et al., Physica (Amsterdam) 199B & 200B, 34 (1994).
33. N = 4 K [31], but the data shown in Fig. 4 were taken at T = 5 K.
34. 6 [30] reveal a resonance at 5 meV previously attributed to the transitions across the hybridization gap. However, the spectral weight removed from a much broader region indicates that the gap could be as high as 200 meV.
35. B.C. Webb et al., Phys. Rev. Lett. 57, 1951 (1986).
36. 3 [12] is not very far from the line. This does not contradict the prediction of the hybridization theory. The theory merely predicts that nonmagnetic HF compounds should be on the universal line.
37. P. Fulde, Physica (Amsterdam) 230B-232B, 1 (1997).