Fermi surfaces and electronic topological transitions in metallic solid solutions

Bruno, E.; Ginatempo, B.; Guiliano, E.S.; Ruban, Andrei V.; Vekilov, Yu. Kh.

doi:10.1016/0370-1573(94)90056-6

Cited by 79 publications

(56 citation statements)

References 146 publications

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“…The composition range in which the T c increases sharply in the Mo 1−x Re x alloys, corresponds to the same composition range where the existence of two electronic topological transitions (ETT) have been reported for the critical concentrations x c1 = 0.05 and x c2 = 0.11 [8,9,10,11,12,13,14]. The ETT is associated with the appearance or the disappearance of pockets of Fermi surface when an external parameter such as composition, pressure, and/or magnetic field is varied [15]. The coefficient of the thermoelectric power α/T in the zero temperature limit shows a giant enhancement around x C2 = 0.11 [8,11,12].…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy

Sundar¹,

Banik²,

Chandra³

et al. 2016

J. Phys.: Condens. Matter

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Abstract.We have studied the electronic structure of Mo rich Mo 1−x Re x alloys (0≤ x ≤0.4) using valence band photoemission spectroscopy in the photon energy range 23-70 eV and density of states calculations. Comparison of the photoemission spectra with the density of states calculations suggests that with respect to the Fermi level E F , the d states lie mostly in the range 0 to -6 eV binding energy whereas s states lie in the range -4 to -10 eV binding energy. We have observed two resonances in the photoemission spectra of each sample, one at about 35 eV photon energy and other at about 45 eV photon energy. Our analysis suggest that the resonance at 35 eV photon energy is related to the Mo 4p-5s transition and the resonance at 45 eV photon energy is related to the contribution from both the Mo 4p-4d transition (threshold: 42 eV) and Re 5p-5d transition (threshold: 46 eV). In the CIS plot, the resonance at 35 eV incident photon energy for binding energy features in the range of E F (B.E. = 0) to -5 eV becomes progressively less prominent with the increasing Re concentration x and vanishes for x > 0.2. The difference plots obtained by subtracting the valence band photoemission spectrum of Mo from that of Mo 1−x Re x alloys, measured at 47 eV photon energy, reveal that the Re d like states appear near E F when Re is alloyed with Mo. These results indicate that interband s-d interaction, which is weak in Mo, increases with the increasing x and influences the nature of superconductivity in the alloys with higher x.

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Section: Introductionmentioning

confidence: 99%

Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy

Sundar¹,

Banik²,

Chandra³

et al. 2016

J. Phys.: Condens. Matter

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“…solid solutions [38,40], semiconductors [38,41], and high-temperature superconductors [42,43]. However, these materials need to be tuned to the LT by external pressure or doping.…”

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confidence: 99%

Cascade of Magnetic-Field-Induced Lifshitz Transitions in the Ferromagnetic Kondo Lattice Material YbNi4P2

et al. 2017

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“…It changes sign with decreasing temperature at about 250 K and remains negative down to the 50 K with a minimum value of -1 μV/K at about 120 K. The reason of the sign reversal of S needs to be sought in the metal character of this sample. In solid solutions of metals containing transition metals, S changes sign with composition x at T = 0 K [7]. Theoretical studies relate this sign reversal in solid-solutions of metals to bandstructure effects, i.e.…”

Section: Introductionmentioning

confidence: 95%

Seebeck effect of as‐grown and micro‐structured metallic (Zn,Al)O

Homm

Teubert

Henning

et al. 2010

Phys. Status Solidi (c)

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We studied the Seebeck coefficient S of sputtered Zn0.98Al 0.02O samples with free carrier concentrations varying from 10 18 to 1021 cm-3. The temperature dependence of the Seebeck coefficient at low carrier concentrations exhibits typical semiconductor behavior (S < 0 and pronounced phonon drag below 80K) whereas the metallic as-grown Zn0.98Al0.02O shows a sign reversal of the Seebeck coefficient with decreasing temperature which is related to the not square-root-like density of states of this degenerately doped metallic material. Furthermore, metallic specimens were microstructured by photolithography and wet-chemical etching with a pattern based on a square grid with a unit cell consisting of a centered square-hole. The Seebeck coefficient changed systematically with decreasing size of the unit cell. The change of S is caused by a shift of the Fermi energy due to the creation of additional surface traps at the sidewalls of the micro holes

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Fermi surfaces and electronic topological transitions in metallic solid solutions

Cited by 79 publications

References 146 publications

Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy

Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy

Cascade of Magnetic-Field-Induced Lifshitz Transitions in the Ferromagnetic Kondo Lattice Material YbNi4P2

Seebeck effect of as‐grown and micro‐structured metallic (Zn,Al)O

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Fermi surfaces and electronic topological transitions in metallic solid solutions

Cited by 79 publications

References 146 publications

Electronic structure of Mo1−xRexalloys studied through resonant photoemission spectroscopy

Electronic structure of Mo1−xRexalloys studied through resonant photoemission spectroscopy

Cascade of Magnetic-Field-Induced Lifshitz Transitions in the Ferromagnetic Kondo Lattice Material YbNi4P2

Seebeck effect of as‐grown and micro‐structured metallic (Zn,Al)O

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Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy

Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy