<scp>F</scp>ermi Surfaces in Strongly Correlated Electron Systems

Ōnuki, Yoshichika; Goto, T.; Kasuya, T.

doi:10.1002/9783527603978.mst0037

Cited by 3 publications

(6 citation statements)

References 182 publications

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“…Magnetic moment oscillations are measured as a function of the magnetic field for different orientations of the sample, and from the angular dependence of the dHvA frequency f, obtained by fast Fourier transformation (FFT) of the oscillation curves, the topology of the Fermi surface can be determined with the help of energy-band calculations. The dHvA effect was first studied for the s and p electron systems, then for interacting electron systems based on the transition metal compounds, and eventually extended to strongly correlated electron systems of rare earth, uranium, and transuranium compounds [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Fermi surface, magnetic, and superconducting properties in actinide compounds

Ōnuki

Settai

Haga

et al. 2014

Comptes Rendus. Physique

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The de Haas-van Alphen effect, which is a powerful method to explore Fermi surface properties, has been observed in cerium, uranium, and nowadays even in neptunium and plutonium compounds. Here, we present the results of several studies concerning the Fermi surface properties of the heavy fermion superconductors UPt 3 and NpPd 5 Al 2 , and of the ferromagnetic pressure-induced superconductor UGe 2 , together with those of some related compounds for which fascinating anisotropic superconductivity, magnetism, and heavy fermion behavior has been observed.

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Section: Introductionmentioning

confidence: 99%

Fermi surface, magnetic, and superconducting properties in actinide compounds

Ōnuki

Settai

Haga

et al. 2014

Comptes Rendus. Physique

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“…[1][2][3] In the Kondo lattice compounds, ground-state properties are determined by the competition between the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction and the Kondo interaction. The energy scales of both interactions are related to the effective hybridization strength, jJ cf jDð" F Þ, between 4f or 5f electrons and conduction electrons, i.e., T RKKY / J 2 cf Dð" F Þ and T K / exp½À1=ðjJ cf jDð" F ÞÞ.…”

Section: Introductionmentioning

confidence: 99%

“…At very low temperatures, some compounds show interesting non-BCS superconducting properties based on magnetically mediated pairing mechanisms. [1][2][3] On the other hand, Yb-based compounds have been extensively investigated since Yb has one 4f -hole and are considered as a countersystem to one-4f -electron Ce-based compounds. The electron-hole analogy between the Yb 3þ (4f 13 ) and Ce 3þ (4f 1 ) electronic configurations tends to induce the localization of 4f electrons, enhancing a magnetically ordered state when pressure is applied to nonmagnetic Yb-based compounds.…”

Section: Introductionmentioning

confidence: 99%

Field-Induced Quadrupolar Ordered Phase for H∥<111> in Heavy-Fermion Compound YbCo₂Zn₂₀

et al. 2011

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Magnetic susceptibility, high-field magnetization up to 500 kOe, and specific heat in a wide temperature range from 0.06 to 300 K were measured for single crystals of the cubic heavy-fermion compound YbCo 2 Zn 20 in order to elucidate the electronic states of the compound at low temperatures. A strong increase in the magnetic specific heat in the form of C mag =T below $1 K is approximately explained by the resonant level model for S ¼ 1=2 with the Kondo temperature T K ¼ 1 K, and an extremely large C mag =T ' 8 J/(K 2 Ámol) below about 0.2 K is explained by considering the magnetic entropy of the doublet ground state in the 4f crystalline electric field (CEF) scheme of an Yb 3þ ion, which corresponds to an extremely large electronic specific heat coefficient. The field-induced ordered phase for H k h111i, which has recently been found by low-temperature magnetization measurements, was precisely studied by electrical resistivity and specific heat measurements, and was observed in a limited angular range around the h111i direction. On the basis of CEF analyses, the level crossing of the two lowest CEF states is essentially important to understand the field-induced ordered phase, which can be reduced to a field-induced antiferro-quadrupolar ordering based on the À 3 -type quadrupole moment O 0 2 .

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“…Superconductivity is found below 0.48 K in a wide pressure region from 4 to 10 GPa. The upper critical field H c2 (0) is about 2 T, indicating heavy fermion superconductivity.In cerium and uranium compounds, the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction and the Kondo effect compete with each other [1,2]. The competition between the RKKY interaction and the Kondo effect was discussed by Doniach [3] as a function of |J cf |D(ε F ), where |J cf | is the magnitude of the magnetic exchange interaction and D(ε F ) is the electronic density of states at the Fermi energy ε F .…”

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“…On the other hand, some cerium compounds such as CeCu 6 and CeRu 2 Si 2 show no longrange magnetic ordering, because the Kondo effect overcomes the RKKY interaction. These compounds are called heavy fermion compounds since they have an extremely large electronic specific heat coefficient γ : γ 10 4 /T K (mJ K −2 mol −1 ), where T K is called the Kondo temperature: T K = 5 K in CeCu 6 , for example [1,2]. In fact, a large cyclotron effective mass of 120 m 0 was detected in the de Haas-van Alphen oscillation in CeRu 2 Si 2 [4].…”

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High-pressure effect on the electronic state in CeNiGe₃: pressure-induced superconductivity

Nakashima

Tabata

Thamizhavel

et al. 2004

J. Phys.: Condens. Matter

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We have measured the electrical resistivity of an antiferromagnetic Kondo compound CeNiGe 3 under pressure. The Néel temperature initially increases with pressure P up to 3 GPa, then decreases rather steeply with further increasing pressure, and becomes zero at a critical pressure P c 5.5 GPa. The A and ρ 0 values of the resistivity ρ = ρ 0 + AT 2 in the Fermi liquid relation become maximum around P c , the A value attaining an extremely large value which is comparable with that in a heavy fermion superconductor CeCu 2 Si 2. Superconductivity is found below 0.48 K in a wide pressure region from 4 to 10 GPa. The upper critical field H c2 (0) is about 2 T, indicating heavy fermion superconductivity. In cerium and uranium compounds, the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction and the Kondo effect compete with each other [1, 2]. The competition between the RKKY interaction and the Kondo effect was discussed by Doniach [3] as a function of |J cf |D(ε F), where |J cf | is the magnitude of the magnetic exchange interaction and D(ε F) is the electronic density of states at the Fermi energy ε F. Most cerium compounds order magnetically when the RKKY interaction overcomes the Kondo effect at low temperatures. The magnetic ordering is formed by the localized-4f moments of Ce 3+. The topology of the Fermi surface for the conduction electrons is therefore quite similar to that of the corresponding non-4f lanthanum compounds, although the cyclotron mass of the cerium compounds is typically one to two orders of magnitude larger than that of the lanthanum compounds.

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Fermi Surfaces in Strongly Correlated Electron Systems

Cited by 3 publications

References 182 publications

Fermi surface, magnetic, and superconducting properties in actinide compounds

Fermi surface, magnetic, and superconducting properties in actinide compounds

Field-Induced Quadrupolar Ordered Phase for H∥<111> in Heavy-Fermion Compound YbCo₂Zn₂₀

High-pressure effect on the electronic state in CeNiGe₃: pressure-induced superconductivity

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Fermi Surfaces in Strongly Correlated Electron Systems

Cited by 3 publications

References 182 publications

Fermi surface, magnetic, and superconducting properties in actinide compounds

Fermi surface, magnetic, and superconducting properties in actinide compounds

Field-Induced Quadrupolar Ordered Phase for H∥<111> in Heavy-Fermion Compound YbCo2Zn20

High-pressure effect on the electronic state in CeNiGe3: pressure-induced superconductivity

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Product

Resources

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Field-Induced Quadrupolar Ordered Phase for H∥<111> in Heavy-Fermion Compound YbCo₂Zn₂₀

High-pressure effect on the electronic state in CeNiGe₃: pressure-induced superconductivity