Fermi surface changes due to localized–delocalized f-state transitions in Ce-115 and Pu-115 compounds

Oppeneer, Peter M.; Elgazzar, S.; Shick, A. B.; Opahle, Ingo; Rusz, Ján; Hayn, R.

doi:10.1016/j.jmmm.2006.10.763

Cited by 16 publications

(16 citation statements)

References 54 publications

(106 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FSs shown in Fig. 4 can directly be compared to the published results 38 obtained with the f-delocalized approach for CeCoIn 5 and the f-localized approach for CeRhIn 5 ͑not shown here͒. The FS sheets computed for CeCo͑In 1−x Cd x ͒ 5 with x = 0.1 are comparable to those of pure CeCoIn 5 except for some changes.…”

Section: Modified Vca Calculationsmentioning

confidence: 65%

“…A recent two-fluid analysis 40 of transport data of CeCoIn 5 predicts that a crossover from single-ion Kondo behavior, characterized by localized f electrons, to Kondo lattice behavior, characterized by the development of lattice coherence and delocalization of the f electrons, starts to happen below 45 K. At low temperatures ͑Ͻ500 mK͒, de Haas-van Alphen experiments on CeCoIn 5 , in conjunction with ab initio calculations support a large degree of f delocalization. [36][37][38]47 In contrast, in CeRhIn 5 , the f electron is localized even at low temperatures as follows from low-temperature de Haas-van Alphen and neutronscattering experiments. 15,37,52,53 The situation for CeIrIn 5 is more complex.…”

Section: Discussionmentioning

confidence: 93%

“…For CeRhIn 5 the f electron is known to be localized, a finding which was concluded from neutron scattering and de Haas-van Alphen experiments. 11,15,[36][37][38] The f-localized description works very well for the NQR frequencies and asymmetry parameter of CeRhIn 5 . Neither GGA or GGA+ U gets close to the experimental values.…”

Section: ͒mentioning

confidence: 84%

See 2 more Smart Citations

Probing the electronic structure of pure and dopedCeMIn5(M=Co,Rh<

et al. 2008

View full text Add to dashboard Cite

We report calculations of the electric-field gradients ͑EFGs͒ in pure and doped CeMIn 5 ͑M = Co, Rh, and Ir͒ compounds and compare with experiment. The degree to which the Ce 4f electron is localized is treated within various models: the local-density approximation, generalized gradient approximation ͑GGA͒, GGA+ U, and 4f-core approaches. We find that there is a correlation between the observed EFG and whether the 4f electron participates in the band formation or not. We also find that the EFG evolves linearly with Sn doping in CeRhIn 5 , suggesting the electronic structure is modified by doping. In contrast, the observed EFG in CeCoIn 5 doped with Cd changes little with doping. These results indicate that nuclear quadrupolar resonance is a sensitive probe of electronic structure.

show abstract

Section: Modified Vca Calculationsmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 93%

See 1 more Smart Citation

Probing the electronic structure of pure and dopedCeMIn5(M=Co,Rh<

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Previous theoretical calculations, quantum oscillation, and angle resolved photoemission spectroscopy measurements have shown CeCoIn 5 to have a complex three-dimensional (3D) band structure, with the α and β bands being the most relevant near E F (Fig. 2e) [21][22][23] . Our previous QPI measurements on surface A show features that are most consistent with 2k F scattering originating from the α band.…”

mentioning

confidence: 96%

Visualizing nodal heavy fermion superconductivity in CeCoIn5

et al. 2013

View full text Add to dashboard Cite

Understanding the origin of superconductivity in strongly correlated electron systems continues to be at the forefront of the unsolved problems of physics 1 . Among the heavy f-electron systems, CeCoIn 5 is one of the most fascinating, as it shares many of the characteristics of correlated d-electron high-T c cuprate and pnictide superconductors 2-4 , including competition between antiferromagnetism and superconductivity 5 . Although there has been evidence for unconventional pairing in this compound 6-11 , high-resolution spectroscopic measurements of the superconducting state have been lacking. Previously, we have used high-resolution scanning tunnelling microscopy (STM) techniques to visualize the emergence of heavy fermion excitations in CeCoIn 5 and demonstrate the composite nature of these excitations well above T c (ref. 12). Here we extend these techniques to much lower temperatures to investigate how superconductivity develops within a strongly correlated band of composite excitations. We find the spectrum of heavy excitations to be strongly modified just before the onset of superconductivity by a suppression of the spectral weight near the Fermi energy (E F ), reminiscent of the pseudogap state 13,14 in the cuprates. By measuring the response of superconductivity to various perturbations, through both quasiparticle interference (QPI) and local pair-breaking experiments, we demonstrate the nodal d-wave character of superconducting pairing in CeCoIn 5 .CeCoIn 5 undergoes a superconducting transition at 2.3 K. Despite evidence of unconventional pairing, consensus on the mechanism of pairing and direct experimental verification of the order parameter symmetry are still lacking [6][7][8][9]11 . Moreover, experiments have suggested that superconductivity in this compound emerges from a state of unconventional quasiparticle excitations with a pseudogap phase similar to that found in underdoped high-T c cuprates [15][16][17] . Previously, we demonstrated that scanning tunnelling spectroscopic techniques can be used to directly visualize the emergence of heavy fermion excitations in CeCoIn 5 and their quantum critical nature 12 . Through these measurements, we also demonstrated the composite nature of heavy quasiparticles and showed their band formation as the f -electrons hybridize with the spd-electrons starting at 70 K, well above T c (ref. 12). This previous breakthrough, together with our recent development of high-resolution millikelvin STM, offers a unique opportunity to measure how superconductivity emerges in a heavy electron system. Figure 1 shows STM topographs of the two commonly observed atomically ordered surfaces of CeCoIn 5 produced after the cleaving of single crystals in situ in the ultra-high vacuum environment 1 Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA, 2 Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. † These authors contributed equally to this work. *e-mail: yazdani@pr...

show abstract

“…Although understanding details of the QPI in Fig. 4 requires detailed modelling of the band structure of the 115 compounds, the square-like patterns observed in the data correspond to scattering wavevectors that can be identified from the calculated local-density approximation (LDA) band structure 46 (see Supplementary Information section V). We find that analysing the features of the energy-resolved DFT maps provides direct evidence for mass enhancement of quasiparticles, in unison with related signatures in the tunnelling spectra.…”

Section: Visualizing Quasiparticle Mass Enhancementmentioning

confidence: 99%

Visualizing heavy fermions emerging in a quantum critical Kondo lattice

Aynajian

Neto

Gyenis

et al. 2012

Nature

206

211

View full text Add to dashboard Cite

In solids containing elements with f orbitals, the interaction between f-electron spins and those of itinerant electrons leads to the development of low-energy fermionic excitations with a heavy effective mass. These excitations are fundamental to the appearance of unconventional superconductivity and non-Fermi-liquid behaviour observed in actinide- and lanthanide-based compounds. Here we use spectroscopic mapping with the scanning tunnelling microscope to detect the emergence of heavy excitations with lowering of temperature in a prototypical family of cerium-based heavy-fermion compounds. We demonstrate the sensitivity of the tunnelling process to the composite nature of these heavy quasiparticles, which arises from quantum entanglement of itinerant conduction and f electrons. Scattering and interference of the composite quasiparticles is used to resolve their energy-momentum structure and to extract their mass enhancement, which develops with decreasing temperature. The lifetime of the emergent heavy quasiparticles reveals signatures of enhanced scattering and their spectral lineshape shows evidence of energy-temperature scaling. These findings demonstrate that proximity to a quantum critical point results in critical damping of the emergent heavy excitation of our Kondo lattice system.Comment: preprint version, 26 pages, 6 figures. Supplementary: 15 pages, 14 figure

show abstract

Fermi surface changes due to localized–delocalized f-state transitions in Ce-115 and Pu-115 compounds

Cited by 16 publications

References 54 publications

Probing the electronic structure of pure and dopedCeMIn5(M=Co,Rh<

Probing the electronic structure of pure and dopedCeMIn5(M=Co,Rh<

Visualizing nodal heavy fermion superconductivity in CeCoIn5

Visualizing heavy fermions emerging in a quantum critical Kondo lattice

Contact Info

Product

Resources

About