Calorimetric investigation of CeRu2Ge2 up to 8 GPa

Bouquet, F.; Wang, Y.; Wilhelm, H.; Jaccard, D.; Junod, A.

doi:10.1016/s0038-1098(99)00505-0

Cited by 32 publications

(36 citation statements)

References 20 publications

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“…Based on these results as well as earlier transport [16,17] and calorimetric measurements [18] a (T, p) phase diagram of CeRu 2 Ge 2 can be drawn (Fig. 3).…”

Section: Fig 2)supporting

confidence: 55%

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High-pressure transport properties of CeRu₂Ge₂

Wilhelm

Jaccard

Zlatič

et al. 2005

J. Phys.: Condens. Matter

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The pressure-induced changes in the temperature-dependent thermopower S(T ) and electrical resistivity ρ(T ) of CeRu2Ge2 are described within the single-site Anderson model. The Ce-ions are treated as impurities and the coherent scattering on different Ce-sites is neglected. Changing the hybridisation Γ between the 4f-states and the conduction band accounts for the pressure effect. The transport coefficients are calculated in the non-crossing approximation above the phase boundary line. The theoretical S(T ) and ρ(T ) curves show many features of the experimental data. The seemingly complicated temperature dependence of S(T ) and ρ(T ), and their evolution as a function of pressure, is related to the crossovers between various fixed points of the model.

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“…Based on these results as well as earlier transport [16,17] and calorimetric measurements [18] a (T, p) phase diagram of CeRu 2 Ge 2 can be drawn (Fig. 3).…”

Section: Fig 2)supporting

confidence: 55%

“…Detailed (T, p) phase diagram of CeRu2Ge2 as obtained from electrical resistivity [16,17], calorimetric [18], and the combined ρ(T ) and S(T ) (bold symbols) measurements [10]. The long-range magnetic order (TN and TL: antiferromagnetic, TC : ferromagnetic) is suppressed at pc ≈ 7.8 GPa.…”

Section: Fig 2)mentioning

confidence: 99%

High-pressure transport properties of CeRu₂Ge₂

Wilhelm

Jaccard

Zlatič

et al. 2005

J. Phys.: Condens. Matter

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show abstract

“…A major step towards measuring C(T ) under extreme conditions has been achieved by implementing the actechnique in a Bridgman-type of pressure cell suited for 10 GPa [14]. The sample was embedded in a soft mineral (steatite) and an ac-current was supplied to a heater close to the sample.…”

Section: Introductionmentioning

confidence: 99%

Calorimetric and transport investigations ofCePd2+xGe2−x
Wilhelm
¹
,
Jaccard²
2002
Phys. Rev. B
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The influence of pressure on the magnetically ordered CePd2.02Ge1.98 has been investigated by a combined measurement of electrical resistivity, ρ(T ), and ac-calorimetry, C(T ), for temperatures in the range 0.3 K < T < 10 K and pressures, p, up to 22 GPa. Simultaneously CePd2Ge2 has been examined by ρ(T ) down to 40 mK. In CePd2.02Ge1.98 and CePd2Ge2 the magnetic order is suppressed at a critical pressure pc = 11.0 GPa and pc = 13.8 GPa, respectively. In the case of CePd2.02Ge1.98 not only the temperature coefficient of ρ(T ), A, indicates the loss of magnetic order but also the ac-signal 1/Vac ∝ C/T recorded at low temperature. The residual resistivity is extremely pressure sensitive and passes through a maximum and then a minimum in the vicinity of pc. The (T, p) phase diagram and the A(p)-dependence of both compounds can be qualitatively understood in terms of a pressure-tuned competition between magnetic order and the Kondo effect according to the Doniach picture. The temperature-volume (T, V ) phase diagram of CePd2Ge2 combined with that of CePd2Si2 shows that in stoichiometric compounds mainly the change of interatomic distances influences the exchange interaction. It will be argued that in contrast to this the much lower pc-value of CePd2.02Ge1.98 is caused by an enhanced hybridization between 4f and conduction electrons.

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“…Two independent experiments [15,16,17] using the same compound but in different pressure devices and pressure transmitting media provide experimental information about the cut-off frequency. Both investigations explored pressures up to 8 GPa and temperatures in the range 1.5 K< T < 10 K. Figure 3 shows the pressure chamber of the Bridgman cell before closing the device.…”

Section: Ac-calorimetry In Different Pressure Environmentsmentioning

confidence: 99%

AC-Calorimetry at High Pressure and Low Temperature

Wilhelm

2003

Advances in Solid State Physics

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Recent developments of the AC-calorimetric technique adapted for the needs of high pressure experiments are discussed. A semi-quantitative measurement of the specific heat with a Bridgman-type of pressure cell as well as a diamond anvil cell is possible in the temperature range 0.1 K < T < 10 K. The pressure transmitting medium used to ensure good pressure conditions determines to a great extent via its thermal conductivity the operating frequency and thus the accessible temperature range. Investigations with different pressure transmitting media for T > 1.5 K reveal for solid He a cut-off frequency which is considerably higher than for steatite. Experiments below 1 K and pressures above 10 GPa clearly show that the pressure dependence of the linear temperature coefficient of the specific heat can be measured. It is in qualitative agreement to a related quantity obtained quasi-simultaneously by electrical resistivity measurements on the same sample.Comment: 14 pages, 7 figures. The manuscript with high resoultion figures (pdf-file, about 1Mb) can be downloaded from http://www.cpfs.mpg.de/~wilhelm

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Calorimetric investigation of CeRu2Ge2 up to 8 GPa

Cited by 32 publications

References 20 publications

High-pressure transport properties of CeRu₂Ge₂

High-pressure transport properties of CeRu₂Ge₂

Calorimetric and transport investigations ofCePd2+xGe2−x
Wilhelm
¹
,
Jaccard²
2002
Phys. Rev. B
Self Cite

AC-Calorimetry at High Pressure and Low Temperature

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Calorimetric investigation of CeRu2Ge2 up to 8 GPa

Cited by 32 publications

References 20 publications

High-pressure transport properties of CeRu2Ge2

High-pressure transport properties of CeRu2Ge2

Calorimetric and transport investigations ofCePd2+xGe2−xWilhelm1, Jaccard2 2002Phys. Rev. BSelf Cite

AC-Calorimetry at High Pressure and Low Temperature

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High-pressure transport properties of CeRu₂Ge₂

High-pressure transport properties of CeRu₂Ge₂

Calorimetric and transport investigations ofCePd2+xGe2−x
Wilhelm
¹
,
Jaccard²
2002
Phys. Rev. B
Self Cite