Electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ce</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RhIn</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>: A two-dimensional heavy-fermion system studied by angle-resolved photoemission spectroscopy

Jiang, Rui; Mou, Daixing; Liu, Chang; Zhao, Xin; Yao, Yongxin; Ryu, Hyejin; Petrović, C.; Ho, Kai Ming; Kaminski, Adam

doi:10.1103/physrevb.91.165101

Cited by 12 publications

(11 citation statements)

References 23 publications

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“…While cubic CeIn 3 (n = 1, m = 0) is a completely isotropic system, the layered structures with m = 0 lead to strongly anisotropic properties and quasi-two-dimensional Fermi surfaces. Indeed, quasi-two-dimensional Fermi surface sheets were observed in both monolayer (n = 1, m = 1) systems CeCoIn 5 9,10 , CeIrIn 5 11 , CeRhIn 5 12,13 and bilayer (n = 2, m = 1) compounds Ce 2 RhIn 8 14,15 and Ce 2 PdIn 8 16 . The degree of two dimensionality is expected to increase with increasing the distance between CeIn 3 layers.…”

Section: Introductionmentioning

confidence: 99%

Specific heat in high magnetic fields and magnetic phase diagram ofCePt2In7

et al. 2016

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We report specific heat measurements on a high quality single crystal of the heavy-fermion compound CePt2In7 in magnetic fields up to 27 T. The zero-field specific heat data above the Néel temperature, TN , suggest a moderately enhanced value of the electronic specific heat coefficient γ = 180 mJ/K 2 mol. For T < TN , the data at zero applied magnetic field are consistent with the existence of an anisotropic spin-density wave opening a gap on almost entire Fermi surface, suggesting extreme two-dimensional electronic and magnetic structures for CePt2In7. TN is monotonically suppressed by magnetic field applied along the c-axis. When field is applied parallel to the a-axis, TN first increases at low field up to about 10 T and then decreases monotonically at higher field. Magnetic phase diagram based on specific heat measurements suggests that a field-induced quantum critical point is likely to occur slightly below 60 T for both principal orientations of the magnetic field.

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Section: Introductionmentioning

confidence: 99%

Specific heat in high magnetic fields and magnetic phase diagram ofCePt2In7

et al. 2016

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“…Low-dimensional Ce-based systems hold a promise for the successful angle-resolved photoemission spectroscopy (ARPES) exploration of the HF electronic structure with high momentum and energy resolution. Most prior ARPES investigations of Ce-based HFs have been done on 3D systems but significant k z broadening [10][11][12][13][14] limits the intrinsic accuracy of 3D band measurement. Low photon energies produce high-energy and in-plane momentum resolutions; however, the 4f signal is quite low and sits atop a relatively large background.…”

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confidence: 99%

Crystal electric field splitting and f -electron hybridization in heavy-fermion CePt2In7

et al. 2019

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We use high-resolution angle-resolved photoemission spectroscopy to investigate the electronic structure of the antiferromagnetic heavy fermion compound CePt2In7, which is a member of the CeIn3-derived heavy fermion material family. Weak hybridization among 4f electron states and conduction bands was identified in CePt2In7 at low temperature much weaker than that in the other heavy fermion compounds like CeIrIn5 and CeRhIn5. The Ce 4f spectrum shows fine structures near the Fermi energy, reflecting the crystal electric field splitting of the 4f 1 5/2 and 4f 1 7/2 states. Also, we find that the Fermi surface has a strongly three-dimensional topology, in agreement with density-functional theory calculations. PACS numbers: 74.25.Jb,71.18.+y,74.70.Tx, The physics underlying the formation of superconductivity from a coherent heavy fermion (HF) state has persisted as a central mystery despite more than four decades of intensive experimental and theoretical study [1,2]. HF superconductivity, similar to traditional Bardeen-Cooper-Schrieffer (BCS) superconductivity, is more likely to occur in compounds with particular crystal structures [3,4], and for magnetically mediated superconductivity, quasi-two-dimensional (2D) compounds are likely to have a higher transition temperature than a three-dimensional counterpart [5]. This expectation appears to be borne out in a family of tetragonal HF compounds Ce m M n In 3m+2n (M = Co, Rh, and Ir) in which the quasi-2D members with m=1, n=1 have T c 's [6] up to an order of magnitude higher than the maximum pressure-induced T c of 0.25 K found in cubic building block CeIn 3 [7]. Recent polarized soft x-ray absorption and nonresonant inelastic x-ray scattering experiments find that, in addition to the crystal structure, details of anisotropic hybridization of f and itinerant electrons play a nontrivial role in determining the ground state of the m=1, n=1 family members [8,9]. Understanding how superconductivity originates from a strongly correlated ground state which must be associated with structure, dimensionality, and orbital anisotropy requires detailed high-resolution techniques that allow studying quantitatively a system's electronic structure.Low-dimensional Ce-based systems hold a promise for the successful angle-resolved photoemission spectroscopy (ARPES) exploration of the HF electronic structure with high momentum and energy resolution. Most prior ARPES investigations of Ce-based HFs have been done on 3D systems but significant k z broadening [10-14] limits the intrinsic accuracy of 3D band measurement. Low photon energies produce high-energy and in-plane momentum resolutions; however, the 4f signal is quite low and sits atop a relatively large background. The part of the reciprocal-space spectrum where the nearly flat 4f bands, split by spin-orbit interaction, intersect with conduction bands is the site of interest for detailed inquiry. A Ce-based HF system, as close to 2D as possible, is needed to extract this information and that would provide a level of detail comparabl...

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“…In this material, no superconducting or magnetic order was found down to 50 mK 32 , but a non-Fermi-liquid behavior was observed in applied magnetic fields 33 . For all three compounds, quantumoscillation measurements and/or angle-resolved photoemission spectroscopy revealed quasi-2D FSs 31,[34][35][36] .…”

Section: Introductionmentioning

confidence: 94%

Fermi-surface topology of the heavy-fermion system Ce2PtIn8

et al. 2018

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Ce2PtIn8 is a recently discovered heavy-fermion system structurally related to the well-studied superconductor CeCoIn5. Here, we report on low-temperature de Haas-van Alphen-effect measurements in high magnetic fields in Ce2PtIn8 and Pr2PtIn8. In addition, we performed band-structure calculations for localized and itinerant Ce-4f electrons in Ce2PtIn8. Comparison with the experimental data of Ce2PtIn8 and of the 4f -localized Pr2PtIn8 suggests the itinerant character of the Ce-4f electrons. This conclusion is further supported by the observation of effective masses in Ce2PtIn8, which are strongly enhanced with up to 26 bare electron masses.

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Electronic structure ofCe2RhIn8: A two-dimensional heavy-fermion system studied by angle-resolved photoemission spectroscopy

Cited by 12 publications

References 23 publications

Specific heat in high magnetic fields and magnetic phase diagram ofCePt2In7

Specific heat in high magnetic fields and magnetic phase diagram ofCePt2In7

Crystal electric field splitting and f -electron hybridization in heavy-fermion CePt2In7

Fermi-surface topology of the heavy-fermion system Ce2PtIn8

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