Kaczorowski<i>et al.</i>Reply:

Kaczorowski, D.; Pikul, Adam; Gnida, D.; Tran, V.H.

doi:10.1103/physrevlett.104.059702

Cited by 43 publications

(72 citation statements)

References 5 publications

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“…A broad peak is found at T coh ¼ 25 K, which is attributed to a crossover between incoherent scattering at high temperature and the development of a coherent heavy-fermion state at lower temperatures. The curve is very smooth below 20 K, suggesting that there are no impurity phases, especially for the antiferromagnetic CeIn 3 with T N $ 10 K [29,30]. In Fig.…”

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“…It can be viewed as a periodic stacking of two layers of CeIn 3 on a layer of PdIn 2 . To avoid the impurity phase of CeIn 3 [30], very thin crystals were selected for this study, with the typical thickness 40 m. Contacts were made with soldered indium, which were used for both resistivity and thermal conductivity measurements. The resulting contact resistance is $5 m at 1.5 K. In-plane thermal conductivity was measured in a dilution refrigerator, using a standard four-wire steady-state method with two RuO 2 chip thermometers, calibrated in situ against a reference RuO 2 thermometer.…”

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Field-Induced Quantum Critical Point and Nodal Superconductivity in the Heavy-Fermion SuperconductorCe2PdIn8

et al. 2011

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The in-plane resistivity and thermal conductivity of the heavy-fermion superconductor Ce 2 PdIn 8 single crystals were measured down to 50 mK. A field-induced quantum critical point, occurring at the upper critical field H c2 , is demonstrated from the ðTÞ $ T near H c2 and ðTÞ $ T 2 when further increasing the field. The large residual linear term 0 =T at zero field and the rapid increase of ðHÞ=T at low field give evidence for nodal superconductivity in Ce 2 PdIn 8 . The jump of ðHÞ=T near H c2 suggests a first-order-like phase transition at low temperature. These results mimic the features of the famous CeCoIn 5 superconductor, implying that Ce 2 PdIn 8 may be another interesting compound to investigate for the interplay between magnetism and superconductivity. The interplay between magnetism and superconductivity has been a central issue for heavy-fermion superconductors [1], high-T c cuprates [2], and iron pnictides [3]. Among them, one particularly interesting case is the heavy-fermion superconductor CeCoIn 5 , with T c ¼ 2:3 K at ambient pressure [4]. Its superconducting gap has d-wave symmetry [5,6]. While there is no static magnetism in CeCoIn 5 at zero field, a field-induced antiferromagnetic (AF) quantum critical point (QCP) has been clearly demonstrated by resistivity and specific heat measurements [7,8]. Initially, it was very puzzling why the AF QCP is located right at the upper critical field H c2 .Meanwhile, the observations of first-order phase transition at low temperature and H c2 and a second magnetization and specific heat anomaly well inside the superconducting state have been interpreted as the signature of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state [5,[9][10][11][12]. The novel FFLO state with broken spatial symmetry was predicted in the 1960s [13,14], but it has never been experimentally verified before. The possible FFLO state at the low-temperaturehigh-field (LTHF) corner of the H À T phase diagram of CeCoIn 5 has stimulated extensive studies [15].More recently, NMR, neutron scattering, and muon spin rotation ( SR) experiments have provided clear evidence for a field-induced magnetism in this LTHF part of the phase diagram [16][17][18][19][20][21]. It was identified as a spin-density wave (SDW) order with an incommensurate modulation Q ¼ ð0:44; 0:44; 0:5Þ. Interestingly, this SDW order disappears in the normal state above H c2 , showing that magnetic order and superconductivity in CeCoIn 5 are directly coupled [16,17]. While this has nicely explained the field-induced AF QCP at H c2 [7,8], the physical origin of this LTHF superconducting Q phase is still under debate. For example, Yanase and Sigrist have suggested that the incommensurate SDW order is stabilized in the FFLO state by the appearance of the Andreev bound state localized around the zeros of the FFLO order parameter [22]. Aperis, Varelogiannis, and Littlewood have argued that the Q phase is a pattern of coexisting condensates: a d-wave singlet superconducting state, a staggered -triplet superconducting s...

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Field-Induced Quantum Critical Point and Nodal Superconductivity in the Heavy-Fermion SuperconductorCe2PdIn8

et al. 2011

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“…Ce 2 PdIn 8 was first reported by Shepa et al [13], while an independent study has shown a non-Fermi liquid behaviour [14] and HF SC where the SC emerges out of the long-range AF state at T c = 0.68 K and coexist with the AF at ambient-pressure [15]. Based on our results and because the reported Néel temperature equals to the Néel temperature of CeIn 3 , we have ascribed the AF origin to the intergrowth of CeIn 3 phase into Ce 2 PdIn 8 [16].…”

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Solution growth of Ce–Pd–In single crystals: Characterization of the heavy-fermion superconductor Ce2PdIn8

et al. 2010

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Solution growth of single crystals of the recently reported new compound Ce 2 PdIn 8 was investigated. When growing from a stoichiometry in a range 2:1:20 -2:1:35, single crystals of CeIn 3 covered by a thin (~50 μm) single-crystalline layer of Ce 2 PdIn 8 were mostly obtained. Using palladium richer compositions the thickness of the Ce 2 PdIn 8 layers were increased, which allowed mechanical extraction of single-phase slabs of the desired compound suitable for a thorough study of magnetism and superconductivity. In some solution growth products also CePd 3 In 6 (LaNi 3 In 6 -type of structure) and traces of phases with the stoichiometry CePd 2 In 7 , Ce 1.5 Pd 1.5 In 7 (determined only by EDX) have been identified. Magnetic measurements of the Ce 2 PdIn 8 single crystals reveal paramagnetic behaviour of the Ce 3+ ions with significant magnetocrystalline anisotropy. Above 70 K the magnetic susceptibility follows the Curie-Weiss law with considerably different values of the paramagnetic Curie temperature, for the magnetic field applied along the a-(-90 K) and c-(-50 K) axis. Below the reported critical temperature for superconductivity T c (0.69 K) the electrical resistivity drops to zero. Comparative measurements of the electrical resistivity, heat capacity and AC susceptibility of several crystals reveal that the superconducting transition is strongly sample-dependent. IntroductionIn some Ce-based compounds, the interaction of the Ce ions with the conduction electrons often leads to a large enhancement of the effective electron mass. These socalled heavy-fermion (HF) compounds exhibit attractive electronic properties, such as strongly enhanced paramagnetism, non-Fermi liquid behaviour, interplay between magnetism and superconductivity (SC), etc. During the last decade, the attention of many researchers has been focused on the series of HF materials of the general chemical formula Ce m T n In 3m+2n where m, n = 1 or 2 and T = Co, Rh, Ir. These compounds crystallize in the Ho m Co n Ga 3m+2n -type tetragonal structures with the space group P4/mmm. These structures are built by n layers of distorted cuboctahedra [CeIn 3 ] and one monolayer of rectangular parallelepipeds [TIn 2 ] stacked sequentially in the [001] direction [1] making the structure to be quasi-2D. The main building block of these compounds, the cubic CeIn 3 , is a heavy-fermion antiferromagnet (AF) with a Néel temperature T N = 10.2 K [2] and becomes superconducting (SC) under pressure [3]. The whole Ce m T n In 3m+2n series is characterized by interplay between magnetism and unconventional superconductivity, which makes these compounds suitable for thorough studies of varieties of the two cooperative phenomena in strongly correlated electron systems. The quasi-2D R m T n In 3m+2n crystal structure provides investigation of the effect of varying dimensionality on magnetism and unconventional superconductivity because

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“…In contrast to Ce 2 RhIn 8 , Ce 2 PdIn 8 is an ambient-pressure HF superconductor with a sample dependent SC transition temperature with the highest value of T c ~ 0.7 K [15][16][17]. No indications of magnetic ordering have been found.…”

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