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Moreno, N. O.; Bauer, E. D.; Sarrao, J. L.; Hundley, M. F.; Thompson, J. D.; Fisk, Z.

doi:10.1103/physrevb.72.035119

Cited by 33 publications

(25 citation statements)

References 41 publications

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“…The electron-phonon and spin-fluctuation coupling strength can be extracted from the slope of the self-energy in the low-energy region as ReAE n ½k; n ðk F Þ ¼ À n ðk F Þ. measured Sommerfeld coefficient with respect to its noninteracting value % ð1 þ Þ 0 . The reported measured values of are between ¼ 10 and 21 mJ=mol K 2 [5,7]. Our GGA calculated value of 0 ¼ 5:8 mJ=mol K 2 agrees well with the literature [36,37] and thus gives an experimental estimate of exp % 0:7-2:6.…”

Section: Numerical Calculationssupporting

confidence: 89%

“…So far, it has been thought that this physics is not at play in UCoGa 5 with a tetragonal crystal structure and metallic ground state [2]. In fact, it has been dubbed a vegetable, because of its lack of heavy mass [3,4], other competing orders [2,[5][6][7], and showing of a spinlattice relaxation rate that obeys the Korringa law of a conventional Fermi liquid at low temperatures [8]. However, at approximately 75 K, it violates the Korringa law by exhibiting a quadratic-temperature dependence without any sign of magnetic ordering.…”

Section: Introductionmentioning

confidence: 99%

“…The effective Coulomb repulsion U of the 5f electrons is not strong enough to localize all of them, yet it is sufficient to slow them down so they acquire a moderately increased mass near the Fermi level. The central puzzle is how this common low-lying heavy electronic state transforms into stable ground states that differ dramatically within the family [7,13,14]. An understanding of these differences hinges on knowing the nature of the exchanged bosons that dress the bare electrons to become heavy quasiparticles and ultimately drive the system into a particular stable ground state.…”

Section: Introductionmentioning

confidence: 99%

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Imaging the Formation of High-Energy Dispersion Anomalies in the ActinideUCoGa5

et al. 2012

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We use angle-resolved photoemission spectroscopy to image the emergence of substantial dispersion and spectral-weight anomalies in the electronic renormalization of the actinide compound UCoGa 5 that was presumed to belong to a conventional Fermi-liquid family. Kinks or abrupt breaks in the slope of the quasiparticle dispersion are detected both at low (approximately 130 meV) and high (approximately 1 eV) binding energies below the Fermi energy, ruling out any significant contribution of phonons. We perform numerical calculations to demonstrate that the anomalies are adequately described by coupling between itinerant fermions and spin fluctuations arising from the particle-hole continuum of the spin-orbit-split 5f states of uranium. These anomalies resemble the ''waterfall'' phenomenon of the high-temperature copper-oxide superconductors, suggesting that spin fluctuations are a generic route toward multiform electronic phases in correlated materials as different as high-temperature superconductors and actinides.

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Section: Numerical Calculationssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Imaging the Formation of High-Energy Dispersion Anomalies in the ActinideUCoGa5

et al. 2012

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“…Because of its larger ionic radius, In occupies the X site in the 115 compounds with larger unit cell volume, namely A = rare earths in most cases, while uranium with its small ionic radius forms 115 structures stable only when Ga occupies the X site. 10,11 Consistent with this, the Fermi surfaces of the uranium 115 compounds experimentally determined by means of de Haas-van Alphen (dHvA) or angular-resolved photoemission (ARPES) are well explained by band calculations where 5f electrons are treated as band electrons, namely 5f electrons can be regarded as itinerant. [12][13][14][15][16][17][18] Among them, URhGa 5 is a nonmagnetic metal with semimetallic behavior.…”

Section: Introductionmentioning

confidence: 59%

Single-crystal growth and physical properties of URhIn5

et al. 2013

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We have grown the uranium compound URhIn 5 with the tetragonal HoCoGa 5 -type by the In self-flux method. In contrast to the nonmagnetic ground state of the isoelectronic analog URhGa 5 , URhIn 5 is an antiferromagnet with antiferromagnetic transition temperature T N = 98 K. The moderately large electronic specific heat coefficient γ = 50 mJ/K 2 mol demonstrates the contribution of 5f electrons to the conduction band. On the other hand, magnetic susceptibility in the paramagnetic state roughly follows a Curie-Weiss law with a paramagnetic effective moment corresponding to a localized uranium ion. The crossover from localized to itinerant character at low temperature may occur around the characteristic temperature 150 K where the magnetic susceptibility and electrical resistivity show a marked anomaly.

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“…Interesting physical phenomena may arise from this interplay, such as heavy fermion (HF) behavior and unconventional superconductivity in UBe 13 , quadrupolar ordering in UPd 3 , and antiferromagnetism (AFM) in UNiGa 5 [1][2][3]. Unveiling the role of each interaction on the ground state is a non-trivial task which constantly motivates further research.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Kondo behavior inUAuBi2single crystals

Rosa¹,

Luo²,

Bauer³

et al. 2015

Phys. Rev. B

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We combine magnetization, pressure dependent electrical resistivity, and heat capacity measurements to investigate the physical properties of the novel compound UAuBi2. Our single crystals, grown by the self-flux method, share the same tetragonal HfCuSi2-type structure of their Ce-based counterparts. UAuBi2 shows ferromagnetic ordering at Tc = 22.5 K, in contrast with the antiferromagnetic transition found in CeAuBi2 (TN = 12 K) but closely related to UAuSb2 (Tc = 31 K). Despite the differences, all compounds display an easy-axis of magnetization along the c-axis and a large magnetocrystalline anisotropy. Heat capacity and pressure dependent resistivity suggest that UAuBi2 exhibits moderately heavy fermion behavior (γ ∼ 100 mJ/mol.K 2 ) with strongly localized 5f electrons. An intricate competition between crystalline electric field (CEF) effects and two anisotropic exchange interactions (JRKKY) persists in the 5f system, which leads to the striking difference between ground states. The systematic analysis of our macroscopic data using a mean field model including anisotropic JRKKY interactions and the tetragonal CEF Hamiltonian allows us to extract the CEF scheme and the values of JRKKY. Our results suggest a general trend in this family of compounds and shed light on the similarities and differences between 4f and 5f members.

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Thermodynamic and transport properties of single-crystallineUMGa5(M=Fe,

Cited by 33 publications

References 41 publications

Imaging the Formation of High-Energy Dispersion Anomalies in the ActinideUCoGa5

Imaging the Formation of High-Energy Dispersion Anomalies in the ActinideUCoGa5

Single-crystal growth and physical properties of URhIn5

Ferromagnetic Kondo behavior inUAuBi2single crystals

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