Heavy Fermion State Based on the Kondo Effect in EuNi<sub>2</sub>P<sub>2</sub>

Hiranaka, Yuichi; Nakamura, Ai; Hedo, Masato; Takeuchi, Tetsuya; Mori, Atsunobu; Hirose, Yusuke; Mitamura, Katsuya; Sugiyama, Kiyohiro; Hagiwara, Masayuki; Nakama, Takao; Ōnuki, Yoshichika

doi:10.7566/jpsj.82.083708

Cited by 86 publications

(68 citation statements)

References 13 publications

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“…Using the values w = 8 and p H = √ 63, we obtain p eff = 7.48 µ B , which is in good agreement with the experimental value 7.4 µ B [11].…”

Section: Susceptibilitysupporting

confidence: 87%

“…It should be noted however that the relation (8) does not necessarily mean that the Schottky-like anomaly is visible in the experimental data of specific heat C v , though the data of the volume expansion coefficient show a clear anomaly around 40 K [11]. In order to see this point, we consider here a simple Debye model as a lattice contribution C v .…”

Section: Specific Heatmentioning

confidence: 98%

“…at 300 K [11] in the calculations. With use of a characteristic temperature T v = ∆E/k B = 150 K, we find that the formula (3) explains the overall feature of the experimental thermal expansion.…”

Section: Thermal Expansion and Scaling Relationmentioning

confidence: 99%

“…al. [11] grew the single crystalline EuNi 2 P 2 and carried out systematic measurements of resistivity, specific heat, susceptibility, and thermal expansion. The low-temperature data of resistivity and specific heat show the heavy-fermion behavior with a large electronic specific heat coefficient γ = 93 mJ/(K 2 · mol).…”

Section: Introductionmentioning

confidence: 99%

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Two-state Weiss model for the anomalous thermal expansion in EuNi2P2

Kakehashi

Chandra

2014

Physica B: Condensed Matter

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It has recently been found that the single crystalline EuNi 2 P 2 shows an anormalous thermal expansion and its scaling relation to the average 4f electron number. We point out that a phenomenological 2-state Weiss model can explain these behaviors. We also show that the model leads to the observed effective Bohr magneton number per atom (7.4 µ B ) in the high-temperature limit, and is consistent with the temperature dependence of experimental susceptibility. Moreover the model predicts that the 4f contribution to the thermal expansion coefficient is in proportional to that of the specific heat. The results suggest that the strong temperature dependence found in these experimental data originates in the excitations from the heavy-fermion ground state to the independent 4f 7 atomic states.

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“…Using the values w = 8 and p H = √ 63, we obtain p eff = 7.48 µ B , which is in good agreement with the experimental value 7.4 µ B [11].…”

Section: Susceptibilitysupporting

confidence: 87%

Section: Specific Heatmentioning

confidence: 98%

Section: Thermal Expansion and Scaling Relationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Two-state Weiss model for the anomalous thermal expansion in EuNi2P2

Kakehashi

Chandra

2014

Physica B: Condensed Matter

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“…The linear decrease of the unit cell volume with decreasing temperature below T c is qualitatively similar to the one observed in CeRu 2 Si 2 , a compound where the Kondo screening (changing the 4f 1 localized state to a non-magnetic 4f-itinerant state) is accompanied by a volume contraction below the Kondo temperature T K = 20 K [25,26]. In that case, the phenomenon can be interpreted in the framework of a theory describing critical valence fluctuations involving 4f…”

Section: Discussionsupporting

confidence: 48%

Thermal expansion of the heavy-fermion superconductor PuCoGa5

Eloirdi¹,

Giacobbe²,

Celdran³

et al. 2017

Phys. Rev. B

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We have performed high-resolution powder x-ray diffraction measurements on a sample of 242 PuCoGa5, the heavy-fermion superconductor with the highest critical temperature Tc = 18.7 K. The results show that the tetragonal symmetry of its crystallographic lattice is preserved down to 2 K. Marginal evidence is obtained for an anomalous behaviour below Tc of the a and c lattice parameters. The observed thermal expansion is isotropic down to 150 K, and becomes anisotropic for lower temperatures. This gives a c/a ratio that decreases with increasing temperature to become almost constant above ∼150 K. The volume thermal expansion coefficient αV has a jump at Tc, a factor ∼20 larger than the change predicted by the Ehrenfest relation for a second order phase transition. The volume expansion deviates from the curve expected for the conventional anharmonic behaviour described by a simple Grüneisen-Einstein model. The observed differences are about ten times larger than the statistical error bars but are too small to be taken as an indication for the proximity of the system to a valence instability that is avoided by the superconducting state.PACS numbers:

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Large magnetoresistance of EuPtP_1−xAs_x

Sugishima

Wada

Mitsuda

et al. 2015

Physica Status Solidi (b)

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High-field magnetization and magnetoresistance of EuPtP 1Àx As x with 0.55 x 0.70 have been studied. Large negative magnetoresistance associated with the field-induced valence transition was observed. Based on the results, we discuss the nature of the valence transition caused by high magnetic fields. Besides, the compounds exhibit substantial negative magnetoresistance in the low field region below 10 T. It is found that the magnetoresistance is proportional to the square of magnetization. The origin of magnetoresistance in the low field region is also discussed.

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Heavy Fermion State Based on the Kondo Effect in EuNi₂P₂

Cited by 86 publications

References 13 publications

Two-state Weiss model for the anomalous thermal expansion in EuNi2P2

Two-state Weiss model for the anomalous thermal expansion in EuNi2P2

Thermal expansion of the heavy-fermion superconductor PuCoGa5

Large magnetoresistance of EuPtP_1−xAs_x

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Heavy Fermion State Based on the Kondo Effect in EuNi2P2

Cited by 86 publications

References 13 publications

Two-state Weiss model for the anomalous thermal expansion in EuNi2P2

Two-state Weiss model for the anomalous thermal expansion in EuNi2P2

Thermal expansion of the heavy-fermion superconductor PuCoGa5

Large magnetoresistance of EuPtP1−xAsx

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Product

Resources

About

Heavy Fermion State Based on the Kondo Effect in EuNi₂P₂

Large magnetoresistance of EuPtP_1−xAs_x