Antiferromagnetic order and 4f-instability of CePb3

Dürkop, D.; Braun, E.; Politt, B.; Schmidt, Helmut; Roden, B.; Wohlleben, D.

doi:10.1007/bf01312578

Cited by 21 publications

(4 citation statements)

References 10 publications

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“…This was e. g. also suggested 5 in case of CePb 3 which exhibits a magnetic anomaly very much reminiscent of the one observed here 63 . A coherence temperature of the order of T * = 25 K in the 4 u.c.…”

Section: −1 ||supporting

confidence: 84%

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Kondo screening and beyond: An x-ray absorption and dichroism study ofCePt5/Pt(111)

Praetorius

Fauth

2017

Phys. Rev. B

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We use x-ray absorption spectroscopy as well as its linear and circular magnetic dichroisms to characterize relevant interactions and energy scales in the surface intermetallic CePt5/Pt(111). The experiments provide insight into crystal field splitting, effective paramagnetic moments, their Kondo screening and mutual interactions and thus into many aspects which typically determine the low temperature behavior of correlated rare earth compounds. Exploiting the tuneability of Ce valence through the thickness dependent epitaxial strain at the CePt5/Pt(111) interface, we are able to systematically investigate the impact of hybridization strength on these interactions. Considerable Kondo screening is indeed observed at all CePt5 thicknesses, and found to be strongest in case of strongest hybridization. While the magnetic response is commensurate with an impurity Kondo scale of TK > ∼ 10 2 K for specimen temperatures T > ∼ 30 K, this is no longer the case at lower temperature. Its detailed study by XMCD at one specific thickness of CePt5 reveals an anomaly of the susceptibility at T * ≈ 25 K instead, which we tentatively associate with the onset of lattice coherence. At lowest temperature we observe paramagnetic saturation with a small Ce 4f saturation magnetization. Within the framework of itinerant 4f electrons, saturation is due to a field induced Lifshitz transition involving a very heavy band with correspondingly small degeneracy temperature of TF ≈ 7 K. This small energy scale results in the persistence of Curie-Weiss behavior across the entire range of experimentally accessible temperatures (T > ∼ 2 K). Our work highlights the potential of magnetic circular dichroism studies in particular for Kondo and heavy fermion materials, which so far has remained largely unexplored.

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Section: −1 ||supporting

confidence: 84%

“…Instead, we notice that a departure from Curie Weiss behavior may hint at emerging lattice coherence. This was e. g. also suggested 5 in case of CePb 3 which exhibits a magnetic anomaly very much reminiscent of the one observed here 63 . A coherence temperature of the order of T * = 25 K in the 4 u.c.…”

Section: E Low Temperature Behaviorsupporting

confidence: 84%

Kondo screening and beyond: An x-ray absorption and dichroism study ofCePt5/Pt(111)

Praetorius

Fauth

2017

Phys. Rev. B

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“…Our best fit gives f 0 ∼ 0.5 and θ ∼ 25 K and yields an entropy release of ∼ 0.62R ln 2 at T N , which is large compared to the experimental value of 0.32R ln 2, a discrepancy that is likely due to the rapid suppression of the magnetic entropy between ∼ 3 K and T N (see Fig. 8 in [40]).…”

Section: Cepbmentioning

confidence: 57%

“…The susceptibility of CePb 3 has a plateau below T * = 16 K, followed by a peak before the magnetic transition at T N = 1.1 K [40]. Our best fit gives f 0 ∼ 0.5 and θ ∼ 25 K and yields an entropy release of ∼ 0.62R ln 2 at T N , which is large compared to the experimental value of 0.32R ln 2, a discrepancy that is likely due to the rapid suppression of the magnetic entropy between ∼ 3 K and T N (see Fig.…”

Section: Cepbmentioning

confidence: 99%

Emergent states in heavy-electron materials

Yang

Pines

2012

Proc. Natl. Acad. Sci. U.S.A.

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We obtain the conditions necessary for the emergence of various low-temperature ordered states (local-moment antiferromagnetism, unconventional superconductivity, quantum criticality, and Landau Fermi liquid behavior) in Kondo lattice materials by extending the two-fluid phenomenological theory of heavy-electron behavior to incorporate the concept of hybridization effectiveness. We use this expanded framework to present a new phase diagram and consistent physical explanation and quantitative description of measured emergent behaviors such as the pressure variation of the onset of local-moment antiferromagnetic ordering at T N , the magnitude of the ordered moment, the growth of superconductivity within that ordered state, the location of a quantum critical point, and of a delocalization line in the pressure/temperature phase diagram at which local moments have disappeared and the heavy-electron Fermi surface has grown to its maximum size. We apply our model to CeRhIn 5 and a number of other heavy-electron materials and find good agreement with experiment.heavy fermion | kondo liquid | spin liquid H eavy-electron materials provide a unique f -electron laboratory for the study of the interplay between localized and itinerant behavior. At comparatively high temperatures, itinerancy emerges as the localized f -electrons collectively reduce their entropy by hybridizing with the conduction electrons to form a new state of matter, an itinerant heavy-electron Kondo liquid that displays scaling (non-Landau Fermi liquid) behavior (1-8). The emergent Kondo liquid coexists with the hybridized spin liquid that describes the lattice of local moments whose magnitude has been reduced by hybridization until one reaches the comparatively low temperatures at which unconventional superconductivity and hybridized local-moment antiferromagnetism compete to determine the ground state of the system over a wide regime of pressures. In practice, the phases often coexist, as experiments on the 115 [CeRhIn 5 (9-11) and CeCoIn 5 (12)] and 127 [CePt 2 In 7 (13)] Kondo lattice materials demonstrate. A major challenge for the heavy-electron community has been finding a consistent framework and simple phenomenological description of their measured emergent behaviors that include the pressure variation of the onset of antiferromagnetic ordering at T N , the growth of superconductivity within that ordered state, the onset of quantum critical behavior, and the growth of the heavy-electron Fermi surface.Although progress has been made on developing a phenomenological theory of Kondo lattice materials (6), we do not yet possess a microscopic theory of the emergence of the Kondo liquid as a new quantum state of matter that displays universal behavior below a characteristic temperature (1-3, 5), T Ã , or a satisfactory general framework for characterizing the conditions necessary for the emergence of the competing low-temperature ordered states, because experiments (4) have shown that the seminal phase diagram proposed by Doniach (14) does not apply t...

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Many‐body effects in antiferromagnetic 4f‐systems

Bulk

Nolting

1987

Physica Status Solidi (b)

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A many body approach is presented for the electronic excitation spectrum of an antiferromagnetic semiconductor with ABAB-sublattice structure. By use of the s-f model the sensitive dependencies of the quasiparticle density of states (Q-DOS) on the temperature T, the carrier concentration n, and the effective coupling constant g/ W is derived and discussed. The electronic spin polarization per sublattice is a direct consequence of this Q-DOS-behaviour. It increases for higher band occupations, lower temperatures and stronger couplings g/ W. The lower edge of the quasi-particle spectrum shifts with increasing n to higher energies showing for fixed n rather small blue shifts as function of decreasing temperature. E s wird eine Vielteilchennaherung fur das elektronische Anregungsspektrum eines antiferromagnetischen Halbleiters mit ABAB-Untergitterstruktur vorgestellt. Mit Hilfe des s-f-Modells werden die empfindlichen Abhiingigkeiten der Quasiteilchenzustandsdichte (Q-DOS) von derTemperatur T, der Ladungstragerkonzentration n und der effektiv enKopplungskonstante g/ W abgeleitet und diskutiert. Die elektronische Spinpolarisation pro Untergitter ist eine direkte Konsequenz dieses Q-DOS-Verhaltens. Sie nimmt fur hohere Bandbesetzungen, tiefere Temperaturen und starkere Kopplung g/ W zu. Die untere Kante des Quasiteilchenspektrums verschiebt sich mit wachsendem n zu hoheren Energien und zeigt fur festes n ziemlich geringe Blauverschiebungen als Funktion abnehmender Temperatur.

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Antiferromagnetic order and 4f-instability of CePb3

Cited by 21 publications

References 10 publications

Kondo screening and beyond: An x-ray absorption and dichroism study ofCePt5/Pt(111)

Kondo screening and beyond: An x-ray absorption and dichroism study ofCePt5/Pt(111)

Emergent states in heavy-electron materials

Many‐body effects in antiferromagnetic 4f‐systems

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