Thermoelectric power in (, Ni; , Ga) compounds

Toliński, T.; Zlatič, V.; Kowałczyk, A.

doi:10.1016/j.jallcom.2009.10.028

Cited by 27 publications

(19 citation statements)

References 23 publications

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“…CeCu 4 Ga is a heavy fermion compound and is nonmagnetic down to 30 mK as was found in the studies of the magnetic, transport and thermodynamic properties [1][2][3][4][5][6][7][8]. The electronic specific heat coefficient reaches a value of about 3.3 Jmol À 1 K À 2 for extrapolation of the low temperatures range [8] and the Kondo temperature is about 2.4 K. It has also been shown that the crystal electric field (CEF) effects play important role in this compound [7].…”

Section: Introductionmentioning

confidence: 83%

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X-ray photoemission and magnetometric studies of valence changes in Ce(Cu1−xNix)4Ga

Toliński

Chełkowska

Falkowski

et al. 2011

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 83%

“…The electronic specific heat coefficient reaches a value of about 3.3 Jmol À 1 K À 2 for extrapolation of the low temperatures range [8] and the Kondo temperature is about 2.4 K. It has also been shown that the crystal electric field (CEF) effects play important role in this compound [7].…”

Section: Introductionmentioning

confidence: 99%

X-ray photoemission and magnetometric studies of valence changes in Ce(Cu1−xNix)4Ga

Toliński

Chełkowska

Falkowski

et al. 2011

Journal of Magnetism and Magnetic Materials

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“…We have recently assumed [18] that for the energy scale dominated by the crystal electric field the linewidth in Eq. (1) is determined mainly by T CEF , i.e., W f = πT CEF /N f .…”

Section: Transport and Thermal Propertiesmentioning

confidence: 99%

Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi2(Si1-yGey)2

et al. 2017

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We report our studies of the intermediate compositions between CeNi 2 Si 2 and CeNi 2 Ge 2 , i.e., the alloys CeNi 2 (Si 1-y Ge y ) 2 by means of the thermopower, electrical resistivity, specific heat, magnetic susceptibility, and X-ray photoemission measurements. CeNi 2 Si 2 is a fluctuating valence system and CeNi 2 Ge 2 is known to show the heavy fermion behaviour. The change of the temperature dependence of the resistivity towards the typical metallic behaviour occurs below y 0.25. The transition between CeNi 2 Si 2 and CeNi 2 Ge 2 is discussed in the frames of competition between the crystal electric field and Kondo interactions. It is found that valence stabilisation occurs for Ge content y [ 0.25. The hybridization energy Δ determined from the XPS Ce 3d spectrum reflects well the behaviour of the parameter E ex obtained from the analysis of the magnetic susceptibility by the interconfiguration fluctuation model. It has been also shown that thermopower data can be successfully described employing the single ion model for 0.6 \ y \ 1.0 and two-band model including the crystal electric field splitting for y ≤ 0.25.

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“…CeCu 4 Ga has been already widely studied [1][2][3][4][5][6][7][8] and it was verified that it is non-magnetic down to 30 mK with the Kondo temperature T K ¼ 2.4 K. The HF state is evidenced by the large value of the electronic specific heat coefficient g ¼ 3.3 J mol À1 K À2 [7]. Our previous studies of the thermopower have revealed the presence of a large positive peak at 28 K that has been ascribed to the crystal electric field (CEF) effect leading to an average split of the ground state of the order of D ¼ 64 K [8].…”

mentioning

confidence: 99%

“…Our previous studies of the thermopower have revealed the presence of a large positive peak at 28 K that has been ascribed to the crystal electric field (CEF) effect leading to an average split of the ground state of the order of D ¼ 64 K [8]. The gradual substitution of Cu with Ni reveals a fluctuating valence (FV) in the final composition CeNi 4 Ga, which has been shown in our X-ray photoemission spectroscopy (XPS) measurements on the Ce(Cu 1Àx Ni x ) 4 Ga alloys by observation of the evolution of the Ce 3d states and the valence band [9].…”

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confidence: 99%

Specific heat of the Ce(Cu_1−xNi_x)₄Ga alloys

Synoradzki

Kowałczyk

Toliński

2015

Physica Status Solidi (b)

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The influence of the modification of the 3d electronic states in the heavy fermion compound CeCu4Ga by substitution of Cu by Ni is reported. It has been verified that the crystallographic structure is hexagonal of the CaCu5 type and is preserved for all the x values in the alloys Ce(Cu1−xNix)4Ga. The measurements of the specific heat Cp(T) have revealed that the huge electronic specific coefficient γ = 3.3 J mol−1 K−2 for CeCu4Ga is reduced with the progressive Ni addition and follows the behavior of the hybridization parameter of the Ce f states with the conduction electrons. The analysis of the specific heat of the non‐magnetic reference compound LaCu4Ga has shown that including the mass correction corresponding to the change of Ce by La and Cu by Ni does not provide a correct estimation of the phonon term in the Ce(Cu1−xNix)4Ga alloys.

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Thermoelectric power in (, Ni; , Ga) compounds

Cited by 27 publications

References 23 publications

X-ray photoemission and magnetometric studies of valence changes in Ce(Cu1−xNix)4Ga

X-ray photoemission and magnetometric studies of valence changes in Ce(Cu1−xNix)4Ga

Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi2(Si1-yGey)2

Specific heat of the Ce(Cu_1−xNi_x)₄Ga alloys

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Thermoelectric power in (, Ni; , Ga) compounds

Cited by 27 publications

References 23 publications

X-ray photoemission and magnetometric studies of valence changes in Ce(Cu1−xNix)4Ga

X-ray photoemission and magnetometric studies of valence changes in Ce(Cu1−xNix)4Ga

Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi2(Si1-yGey)2

Specific heat of the Ce(Cu1−xNix)4Ga alloys

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Specific heat of the Ce(Cu_1−xNi_x)₄Ga alloys