Comments on the Dense Kondo State

Yamada, Kōsaku; Yosida, Kei; Hanzawa, Katsurou

doi:10.1143/ptp.71.450

Cited by 152 publications

(47 citation statements)

References 5 publications

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“…Above 5.0 GPa, the ρ(T ) curves indicate a two-peak structure, revealing two peaks at T max 1 = 1.1 K and T max 2 = 8.1 K at 5.5 GPa. This is reminiscent of the temperature dependence of the electrical resistivity in cerium compounds due to the combined phenomena between the Kondo effect and the crystalline electric field effect [6]. The pressure dependence of the characteristic temperatures of T max , T max 1 , and T max 2 is plotted in Fig.…”

Section: Experimental Results and Analysesmentioning

confidence: 90%

Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr₂Zn₂₀

et al. 2012

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We studied an effect of pressure on the electronic state of YbIr 2 Zn 20 under magnetic fields. The heavy fermion state at ambient pressure is found to be changed into an antiferromagnetic state at pressures larger than a critical pressure P c 5.2 GPa, where the electronic state indicates a superheavy fermion state with an order of the electronic specific specific heat coefficient γ = 20 J/(K 2 ·mol). The temperature dependence of the electrical resistivity shows a characteristic two-peak structure above 5.0 GPa, implying the combined phenomena between the Kondo effect and the crystalline electric field effect. At 7.6 GPa, the magnetoresistance shows a broad maximum at a critical field H c , corresponding to a pressure-induced antiferromagnetic phase with the Néel temperature T N = 1.4 K. T N increases with further increasing pressure.

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Section: Experimental Results and Analysesmentioning

confidence: 90%

Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr₂Zn₂₀

et al. 2012

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“…We finish by explaining precisely the restoration of full coherence below the Kondo temperature. In order to do this, we set the temperature to zero and perform an exact low-energy solution of the system of equations (25)(26)(27)(28)(29)(30) (this was done in Appendix-C of [40]). This analysis, valid while δE = 0 for an arbitrary number of levels, leads to the following value of the zero temperature, zero frequency density of states in our approximation:…”

Section: Single Level Kondo Effect: Analytical Proofmentioning

confidence: 99%

“…The numerical solution of the set of self-consistent equations (25)(26)(27)(28)(29)(30) allows in principle to investigate all regimes of parameters. We will first concentrate on the gradual suppression of the Kondo effect with decreasing values of the single-level coupling Γ.…”

Section: Single Level Kondo Effect: Analytical Proofmentioning

confidence: 99%

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Coherence and Coulomb blockade in single-electron devices: A unified treatment of interaction effects

et al. 2003

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We study the interplay between Coulomb blockade and the Kondo effect in quantum dots. We use a self-consistent scheme which describes mesoscopic devices in terms of a collective phase variable (slave rotor) and quasiparticle degrees of freedom. In the strong Coulomb blockade regime, we recover the description of metallic islands in terms of a phase only action. For a dot with well-separated levels, our method leads to the Kondo effect. We identify the regime where a crossover between the Coulomb blockade regime at high temperatures and the formation of a Kondo resonance at lower temperature takes place. In addition, we find that for a dot with many overlapping resonances, an inverse crossover can take place. A Kondo resonance which involves many levels within the dot is first formed, and this coherent state is suppressed by correlation effects at lower temperatures. A narrower Kondo resonance, due to a single level in the dot can emerge at even lower temperatures.

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“…18 In CeCd 11 , E 1 = 17.5 K. 14,19 The CEF effect tends to reduce the single ion Kondo temperature by reducing the degeneracy of the ground state. [20][21][22] Given the low ordering temperature, as well as the low CEF splitting in CeZn 11 , pressure may result in significant changes in the low-temperature state, and ultimately is expected to lead to a quantum phase transition, possibly even a quantum critical point. In this paper, we present the results of measurements of electrical resistivity as a function of temperature and applied magnetic field under applied pressures up to 4.9 GPa.…”

Section: Introductionmentioning

confidence: 99%

Electrical resistivity study of CeZn11: Magnetic field and pressure phase diagram up to 5 GPa

et al. 2013

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Thorough resistivity measurements on single crystals of CeZn11 under pressure p and magnetic field H are presented. At ambient pressure, CeZn11 orders antiferromagnetically at TN=2 K. The pressure dependence of the resistivity reveals an increase of the Kondo effect. We determine the pressure evolution of the magnetic exchange interaction between conduction and localized 4f electrons. It qualitatively reproduces the pressure evolution of the magnetic ordering temperature TO1 (with TO1=TN at ambient pressure). In addition to TO1, a new anomaly TO2appears under pressure. Both anomalies are found to increase with applied pressure up to 4.9 GPa, indicating that CeZn11 is far from a pressure induced quantum critical point. Complex T-H phase diagrams are obtained under pressure which reveal the instability of the ground state in this compound. Keywords Physics and Astronomy Disciplines Condensed Matter Physics CommentsThis article is from Physical Review B 88 (2013) Thorough resistivity measurements on single crystals of CeZn 11 under pressure p and magnetic field H are presented. At ambient pressure, CeZn 11 orders antiferromagnetically at T N = 2 K. The pressure dependence of the resistivity reveals an increase of the Kondo effect. We determine the pressure evolution of the magnetic exchange interaction between conduction and localized 4f electrons. It qualitatively reproduces the pressure evolution of the magnetic ordering temperature T O 1 (with T O 1 = T N at ambient pressure). In addition to T O 1 , a new anomaly T O 2 appears under pressure. Both anomalies are found to increase with applied pressure up to 4.9 GPa, indicating that CeZn 11 is far from a pressure induced quantum critical point. Complex T -H phase diagrams are obtained under pressure which reveal the instability of the ground state in this compound.

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Comments on the Dense Kondo State

Cited by 152 publications

References 5 publications

Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr₂Zn₂₀

Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr₂Zn₂₀

Coherence and Coulomb blockade in single-electron devices: A unified treatment of interaction effects

Electrical resistivity study of CeZn11: Magnetic field and pressure phase diagram up to 5 GPa

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Comments on the Dense Kondo State

Cited by 152 publications

References 5 publications

Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr2Zn20

Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr2Zn20

Coherence and Coulomb blockade in single-electron devices: A unified treatment of interaction effects

Electrical resistivity study of CeZn11: Magnetic field and pressure phase diagram up to 5 GPa

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Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr₂Zn₂₀

Pressure-Induced Super Heavy Fermion State and Antiferromagnetism in YbIr₂Zn₂₀