Abstract
Recognising the difficulties in systematic understanding of the physical characteristics of strongly correlated f-electron systems, we considered it worthwhile to subject the so-called “normal” f-electron systems like those of Gd to careful investigations. We find that the spin-disorder contribution to electrical resistivity (p) in the paramagnetic state, instead of remaining constant, apparently shows an increase as the temperature (T) is lowered towards magnetic ordering temperature in some of the Gd alloys. In some cases, the T-dependence of “excess resistance” is so large that a distinct minimum in the plot of ρ versus T can be seen, mimicking the behaviour of Kondo lattices. This excess resistance can be suppressed by the application of a magnetic field, naturally resulting in large magnetoresistance. In addition, these alloys are found to exhibit heavy-fermion-like heat-capacity behavior. These unusual findings imply hither-to-unexplored electron correlation effects even in Gd-based alloys.
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References
E.V. Sampathkumaran and I. Das, Phys. Rev. B, 51, 8178 (1995).
W.P. Beyermann et al, Phys. Rev. Lett. 66, 3289 (1991); W.P. Beyermann et al, Phys. Rev. B, 43, 13130 (1991).
E.V. Sampathkumaran and I. Das, Phys. Rev. B, 51, 8631 (1995); Physica B 223–224, 149 (1996)
R. Mallik, E.V. Sampathkumaran, P.L. Paulose and V. Nagarajan, Phys. Rev. B, 55, R8650 (1997).
R. Mallik, E.V. Sampathkumaran, M. Strecker and G. Wortmann, Europhys. Lett. 41, 315 (1998).
R. Mallik, E.V. Sampathkumaran, P.L. Paulose, H. Sugawara and H. Sato, Pramana — J. Phys. 51, 505 (1998).
R. Mallik and E.V. Sampathkumaran, Phys. Rev. B 58, 9178 (1998).
S.R. Saha, H. Sugawara, T.D. Matsuda, H. Sato, R. Mallik and E.V. Sampathkumaran, Phys. Rev. B 60, 12162 (1999).
Subham Majumdar, E.V. Sampathkumaran, D. Eckert, A. Handstein, K.-H. Muller, S.R. Saha, H. Sugawara and H. Sato, J. Phys.: Condens. Matter. 11, L329 (1999).
Subham Majumdar, M. Mahesh Kumar and E.V. Sampathkumaran, J. Alloys and Compounds, 288, 61 (1999).
Subham Majumdar, R. Mallik, E.V. Sampathkumaran, K. Rupprecht and G. Wortmann, Phys. Rev. B 60, 6770 (1999).
Subham Majumdar and E.V. Sampathkumaran, Phys. Rev. B 61, 43 (2000).
Subham Majumdar, E.V. Sampathkumaran, M. Brando, J. Hemberger and A. Loidl, J. Magn. Magn. Mater. 236, 99 (2001).
A.N. Chaika, A.M. Ionov, M. Busse, S.L. Molodtsov, Subham Majumdar, G. Behr, E.V. Sampathkumaran, W. Schneider and C. Laubschat, Phys. Rev. B 64, 125121 (2001).
S.-K. Ma, Modern Theory of Critical phenomena Benjamin, London, 1976.
M.E. Fisher and J.S. Langer, Phys. Rev. Lett. 20, 665 (1968).
R. Mallik, E.V. Sampathkumaran and P.L. Paulose, Solid State Commun. 106, 169 (1998); see references cited herein for a proposal of “magnetic polarons” for rare-earth-based semiconductors.
J. Deisenhofer, H.-A. Krug von Nidda, A. Loidl and E.V. Sampathkumaran, Solid State Commun., in press; arXiv: Cond-mat/0211587.
Y. Shimakawa, Y. Kubo and T. Manako, Nature (London) 379, 53 (1996).
M.A. Subramanian, B.H. Toby, A.P. Ramirez, W.J. Marshall, A.W. Sleight, and G.H. Kwei, Science 273, 81 (1996).
P. Majumdar and P.B. Littlewood, Nature 395, 479 (1998).
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Sampathkumaran, E.V., Mallik, R. (2003). Do We Understand Electron Correlation Effects in Gadolinium Based Intermetallic Compounds?. In: Hewson, A.C., Zlatić, V. (eds) Concepts in Electron Correlation. NATO Science Series, vol 110. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0213-4_35
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DOI: https://doi.org/10.1007/978-94-010-0213-4_35
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