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[[Image:Classickondo.png|thumb|320px|Kondo effect: How gold with a small amount of what were probably iron impurities behaves at low temperatures]]
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In physics, the '''Kondo effect''' describes the scattering of conduction electrons in a metal due to magnetic impurities, resulting in a characteristic change in electrical resistivity with temperature.<ref>{{cite web |first=Alex C |last=Hewson |coauthors=[[Jun Kondo]] |year=2009 |title=Kondo effect |publisher=[[Scholarpedia]] |volume=4 |number=3 |page=7529 |doi=10.4249/scholarpedia.7529 |url=http://www.scholarpedia.org/article/Kondo_effect |accessdate=2009-12-18}}</ref>
 
The effect was first described by [[Jun Kondo]], who applied third-order perturbation theory to the problem, which predicted that the scattering rate of conduction electrons of the magnetic impurity should diverge as the temperature approaches 0 K.<ref>{{cite journal|doi=10.1143/PTP.32.37|format=free access|title=Resistance Minimum in Dilute Magnetic Alloys|year=1964|last1=Kondo|first1=Jun|journal=Progress of Theoretical Physics|volume=32|pages=37|bibcode = 1964PThPh..32...37K }}</ref> The temperature dependence of the resistivity including the Kondo effect is written as:
 
<math>\rho(T) = \rho_0 + aT^2 + c_m \ln\frac{\mu}{T} + bT^5,</math>
 
where ρ<sub>0</sub> is the residual resistance, aT<sup>2</sup> shows the contribution from the Fermi liquid properties, and the term bT<sup>5</sup> is from the lattice vibrations; a, b and c<sub>m</sub> are constants. Jun Kondo derived the third term of the logarithmic dependence.
Later calculations refined this result to produce a finite resistivity but retained the feature of a resistance minimum at a non-zero temperature. One defines the '''Kondo temperature''' as the energy scale limiting the validity of the Kondo results. The [[Anderson impurity model]] and accompanying [[renormalization]] theory were an important contribution to understanding the underlying physics of the problem.<ref>{{cite journal|doi=10.1103/PhysRev.124.41|url=http://cos.cumt.edu.cn/jpkc/dxwl/zl/zl1/Physical%20Review%20Classics/condensed/061.pdf|title=Localized Magnetic States in Metals|year=1961|last1=Anderson|first1=P.|journal=Physical Review|volume=124|pages=41|bibcode = 1961PhRv..124...41A }}</ref>
 
[[Image:kscheme.jpg|thumb|320px|Schematic of the weakly coupled high temperature situation in which the magnetic moments of conduction electrons in the metal host pass by the impurity magnetic moment at speeds of v<sub>F</sub>, the Fermi velocity, experiencing only a mild antiferromagnetic correlation in the vicinity of the impurity. In contrast, as the temperature tends to zero the impurity magnetic moment and one conduction electron moment bind very strongly to form an overall non-magnetic state.]]
 
The Kondo effect can be considered as an example of [[asymptotic freedom]], i.e. a situation where the coupling becomes non-perturbatively strong at low temperatures and low energies. In the Kondo problem, the coupling refers to the interaction between the localized magnetic impurities and the itinerant electrons.
 
Extended to a lattice of ''magnetic impurities'', the Kondo effect likely explains the formation of [[heavy fermion|''heavy fermions'']] and [[Kondo insulator|''Kondo insulators'']] in intermetallic compounds, especially those involving rare earth elements like [[cerium]], [[praseodymium]], and [[ytterbium]], and actinide elements like [[uranium]]. In [[heavy fermion]] materials, the nonperturbative growth of the interaction leads to quasi-electrons with masses up to thousands of times the free electron mass, i.e., the electrons are dramatically slowed by the interactions. In a number of instances they actually are [[superconductors]]. More recently, it is believed that a manifestation of the Kondo effect is necessary for understanding the unusual metallic delta-phase of [[plutonium]].
 
More recently the Kondo effect has been observed in quantum dot systems.<ref>{{cite journal|doi=10.1126/science.281.5376.540|first=Sara M.|last=Cronenwett|year=1998 |title=A Tunable Kondo Effect in Quantum Dots|journal=Science|volume=281|number=5376|page=540-544|url=http://www.sciencemag.org/content/281/5376/540.abstract|arxiv = cond-mat/9804211 |bibcode = 1998Sci...281..540C }}</ref> In such systems, a quantum dot with at least one unpaired electron behaves as a magnetic impurity, and when the dot is coupled to a metallic conduction band, the conduction electrons can scatter off the dot. This is completely analogous to the more traditional case of a magnetic impurity in a metal.
 
==Notes==
{{Reflist}}
 
==External links==
*[http://www.aist.go.jp/aist_j/information/emeritus_advisor/index.html Jun Kondo's web page]
*[http://jpsj.ipap.jp/journal/JPSJ-74-1.html#Special Kondo Effect - 40 Years after the Discovery] - special issue of the Journal of the Physical Society of Japan
*''The Kondo Problem to Heavy Fermions'' - Monograph on the Kondo effect by A.C. Hewson (ISBN 0-521-59947-4)
*''Exotic Kondo Effects in Metals'' - Monograph on newer versions of the Kondo effect in non-magnetic contexts especially (ISBN 0-7484-0889-4)
*[http://www.nature.com/nature/journal/v410/n6830/abs/410793a0.html ''Correlated electrons in δ-plutonium within a dynamical mean-field picture''], Nature '''410''', 793 (2001). Nature article exploring the links of the Kondo effect and plutonium
 
[[Category:Condensed matter physics]]
[[Category:Electric and magnetic fields in matter]]
[[Category:Physical phenomena]]

Latest revision as of 22:21, 27 December 2014

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