Magnetic and superconducting phases of CePd2Si2

Grosche, F. M.; Julian, S. R.; Mathur, N. D.; Lonzarich, G. G.

doi:10.1016/0921-4526(96)00036-1

Cited by 235 publications

(192 citation statements)

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“…Indeed, quantum fluctuations in this family of heavy fermion superconductors are known to be suppressed by pressure because the AFM order in the Ce-lattice is suppressed. [34][35][36] Figure ure shows that from just above T c to about 4 K, the ρ a (T ) data follow very well a √ T dependence (solid lines are linear fits to the data with ρ a (P, T ) = ρ a0 (P ) + B * (P ) √ T ). The pressure dependence of the coefficient B * is shown in the inset to Fig.…”

Section: Resultsmentioning

confidence: 99%

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

et al. 2015

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Here we present our experimental and theoretical study of the effects of pressure on the transport properties of the heavy-fermion alloy Ce1−xYbxCoIn5 with actual concentration x ≈ 0.07. We specifically choose this value of ytterbium concentration because the magnetic-field-induced quantum critical point, which separates the antiferromagnetic and paramagnetic states at zero temperature, approaches zero, as has been established in previous studies. Our measurements show that pressure further suppresses quantum fluctuations in this alloy, just as it does in the parent compound CeCoIn5. In contrast, the square-root temperature dependent part of resistivity remains insensitive to pressure, indicating that the heavy-quasiparticles are not involved in the inelastic scattering processes leading to such a temperature dependent resistivity. We demonstrate that the growth of the coherence temperature with pressure, as well as the decrease of the residual resistivity, can be accurately described by employing the coherent potential approximation for a disordered Kondo lattice.

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Section: Resultsmentioning

confidence: 99%

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

et al. 2015

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“…Thus, it seems that the additional uniaxial stress is necessary to change the hybridization in an effective way. In CePd 2 Si 2 it shifts p c from 2.8 GPa to 3.9 GPa and leads to an increase in the superconducting transition temperature of about 40% [32] compared to values obtained from samples in a configuration where the crystallographic c-axis was perpendicular to the external force [3,4,29,30].…”

Section: Discussionmentioning

confidence: 97%

“…The electronic interactions in heavy-Fermion (HF) compounds can be influenced in such a way that high pressure favors the Kondo interaction in Ce-compounds [1,2,3,4,5,6,7,8,9] and the RKKY interaction in Yb-systems [10,11]. Thus, pressure suppresses (favors) long range magnetic order and enhances (weakens) the screening of the localized 4f -electrons.…”

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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“…The discovery of P -induced HF superconductors in Ce-based HF-AF compounds has stimulated further experimental works under P [4,5,6,7]. In order to gain profound insight into a relationship between magnetism and superconductivity in HF systems, systematic NMR/NQR experiments under P are important, since they can probe the evolution of the magnetic properties toward the onset of SC phase.Recently, Hegger et al found that a new HF material CeRhIn 5 consisting of alternating layers of CeIn 3 and RhIn 2 reveals an AF-to-SC transition at a relatively lower critical pressure P c = 1.63 GPa than in all previous examples [1,2,3]. The SC transition temperature T c = 2.2 K is the highest one to date among P -induced superconductors [4].…”

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“…Ha, 74.62.Fj, 74.70.Tx, 75.30.Kz, 76.60.Gv It has been reported that a superconducting (SC) order in cerium (Ce)-based heavy-fermion (HF) compounds takes place nearby the border at which an antiferromagnetic (AF) order is suppressed by applying pressure (P ) to the HF-AF compounds CeCu 2 Ge 2 ,[1] CePd 2 Si 2 [2] and CeIn 3 [3]. The superconductivity in these compounds, however, occurs only in extreme conditions where the pressure exceeds ∼ 2 GPa and temperature (T ) is cooled down below ∼ 1 K. Indeed the experiments were restricted mainly to transport measurements.…”

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Pressure-temperature phase diagram of antiferromagnetism and superconductivity inCeRhIn5andCeIn3

et al. 2001

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We report the novel pressure(P ) -temperature(T ) phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 revealed by the 115 In nuclear-spin-lattice-relaxation (T1) measurement. In the itinerant magnet CeRhIn5, we found that the Néel temperature TN is reduced at P ≥ 1.23 GPa with an emergent pseudogap behavior. In CeIn3, the localized magnetic character is robust against the application of pressure up to P ∼ 1.9 GPa, beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations.PACS numbers: PACS: 74.25. Ha, 74.62.Fj, 74.70.Tx, 75.30.Kz, 76.60.Gv It has been reported that a superconducting (SC) order in cerium (Ce)-based heavy-fermion (HF) compounds takes place nearby the border at which an antiferromagnetic (AF) order is suppressed by applying pressure (P ) to the HF-AF compounds CeCu 2 Ge 2 ,[1] CePd 2 Si 2 [2] and CeIn 3 [3]. The superconductivity in these compounds, however, occurs only in extreme conditions where the pressure exceeds ∼ 2 GPa and temperature (T ) is cooled down below ∼ 1 K. Indeed the experiments were restricted mainly to transport measurements. The discovery of P -induced HF superconductors in Ce-based HF-AF compounds has stimulated further experimental works under P [4,5,6,7]. In order to gain profound insight into a relationship between magnetism and superconductivity in HF systems, systematic NMR/NQR experiments under P are important, since they can probe the evolution of the magnetic properties toward the onset of SC phase.Recently, Hegger et al. found that a new HF material CeRhIn 5 consisting of alternating layers of CeIn 3 and RhIn 2 reveals an AF-to-SC transition at a relatively lower critical pressure P c = 1.63 GPa than in all previous examples [1,2,3]. The SC transition temperature T c = 2.2 K is the highest one to date among P -induced superconductors [4]. This finding has opened a way to investigate the P -induced evolution of both magnetic and SC properties over a wide P range. In the previous paper [7], the 115 In NQR study of CeRhIn 5 has clarified the P -induced anomalous magnetism and unconventional superconductivity. In the AF region, the Néel temperature T N exhibits a moderate variation, while the internal field H int at 115 In(1) site in the CeIn 3 plane due to the magnetic ordering is linearly reduced in P = 0 -1.23 GPa, extrapolated to zero at P * = 1.6 ± 0.1 GPa. This P * is comparable to P c = 1.63 GPa at which the SC signature appears [4], which was indicative of a second-order like AF-to-SC transition rather than the first-order one suggested previously [4]. At P = 2.1 GPa, it was found that the nuclear spin-lattice relaxation rate 1/T 1 reveals a T 3 dependence below the SC transition temperature T c , which shows the existence of line-nodes in the gap function [7]. It is, however, not yet clear how the electronic states change with P when the AF phase evolves into the SC phase.On the other hand, CeIn 3 c...

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Magnetic and superconducting phases of CePd2Si2

Cited by 235 publications

References 10 publications

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

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

Pressure-temperature phase diagram of antiferromagnetism and superconductivity inCeRhIn5andCeIn3

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Magnetic and superconducting phases of CePd2Si2

Cited by 235 publications

References 10 publications

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

Pressure studies of the quantum critical alloyCe0.93Yb0.07CoIn5

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

Pressure-temperature phase diagram of antiferromagnetism and superconductivity inCeRhIn5andCeIn3

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