The Low-Temperature Transport Properties of NbSe2

Lee, H. N. S.; McKinzie, H.; Tannhauser, D. S.; Wold, A.

doi:10.1063/1.1657440

Cited by 92 publications

(53 citation statements)

References 10 publications

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“…All of them exceed the θ D = 150 K of the NbSe 2 single crystal30. Furthermore, Debye temperatures of about 200 K are typical for MLCs containing Nb X 2 20232526 and 240(3) K has been reported for the (SnSe) 1.16 (NbSe 2 ) ferecrystal31.…”

Section: Discussionmentioning

confidence: 88%

Superconducting ferecrystals: turbostratically disordered atomic-scale layered (PbSe)1.14(NbSe2)n thin films

Grosse

Alemayehu

Falmbigl

et al. 2016

Sci Rep

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Hybrid electronic heterostructure films of semi- and superconducting layers possess very different properties from their bulk counterparts. Here, we demonstrate superconductivity in ferecrystals: turbostratically disordered atomic-scale layered structures of single-, bi- and trilayers of NbSe2 separated by PbSe layers. The turbostratic (orientation) disorder between individual layers does not destroy superconductivity. Our method of fabricating artificial sequences of atomic-scale 2D layers, structurally independent of their neighbours in the growth direction, opens up new possibilities of stacking arbitrary numbers of hybrid layers which are not available otherwise, because epitaxial strain is avoided. The observation of superconductivity and systematic Tc changes with nanostructure make this synthesis approach of particular interest for realizing hybrid systems in the search of 2D superconductivity and the design of novel electronic heterostructures.

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Section: Discussionmentioning

confidence: 88%

Superconducting ferecrystals: turbostratically disordered atomic-scale layered (PbSe)1.14(NbSe2)n thin films

Grosse

Alemayehu

Falmbigl

et al. 2016

Sci Rep

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“…Given the multiband nature of the system, this is likely to indicate significant removal of DOS at the Fermi surface upon the magnetic ordering, leaving only small patches of hole character below T N . Similarly, drastic removals of DOS with associated sign changes in R H was observed at the CDW transitions in NbSe 2 (8) and α-U (29).…”

Section: Resultsmentioning

confidence: 99%

“…They are a common aspect in cuprate superconductors (1,2), itinerant transition-metal magnets (3,4), and rare-earth compounds (5-7), as well as low-dimensional charge-ordered materials (8,9) and perovskite manganites (10,11). In contrast with commensurate density waves, the incommensurate states are often electronically soft (11), and many spin and charge orders in metals are continuously tunable (9,12).…”

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confidence: 99%

Incommensurate antiferromagnetism in a pure spin system via cooperative organization of local and itinerant moments

Feng

Wang

Silevitch

et al. 2013

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

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Materials with strong correlations are prone to spin and charge instabilities, driven by Coulomb, magnetic, and lattice interactions. In materials that have significant localized and itinerant spins, it is not obvious which will induce order. We combine electrical transport, X-ray magnetic diffraction, and photoemission studies with band structure calculations to characterize successive antiferromagnetic transitions in GdSi. GdSi has both sizable local moments and a partially nested Fermi surface, without confounding contributions from orbital effects. We identify a route to incommensurate order where neither type of moment dominates, but is rooted in cooperative feedback between them. The nested Fermi surface of the itinerant electrons induces strong interactions between local moments at the nesting vector, whereas the ordered local moments in turn provide the necessary coupling for a spindensity wave to form among the itinerant electrons. This mechanism echoes the cooperative interactions between electrons and ions in charge-density-wave materials, and should be germane across a spectrum of transition-metal and rare-earth intermetallic compounds.itinerant magnetism | RKKY interaction | asymmetric line shape I ncommensurate density waves emerge in a wide variety of correlated electron systems. They are a common aspect in cuprate superconductors (1, 2), itinerant transition-metal magnets (3, 4), and rare-earth compounds (5-7), as well as low-dimensional charge-ordered materials (8, 9) and perovskite manganites (10, 11). In contrast with commensurate density waves, the incommensurate states are often electronically soft (11), and many spin and charge orders in metals are continuously tunable (9, 12). Furthermore, the incommensurate structures are often only weakly coupled to other degrees of freedom in the underlying lattice, giving rise to the rare possibility of direct theoretical modeling of a variety of experimentally accessible material systems, spanning from functional materials of technological importance (10, 11) to fundamental topics of emergent states in quantum critical phenomena (9, 12).Spin states with long-range incommensurate magnetic order may be stabilized by itinerant electrons through two distinct mechanisms. If the Fermi surface has well-nested regions, the itinerant electrons themselves typically become unstable toward the formation of a spin-density wave (SDW) (13). A prominent example of this class of materials is elemental chromium (4,13,14). Alternatively, in the presence of local magnetic moments, the itinerant electrons may form screening clouds which mediate magnetic interactions between the local moments and cause them to order through the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction (5, 15).To form a nesting-driven SDW or charge-density wave (CDW) (13), it is necessary to have a nonzero coupling between itinerant electron states on opposing portions of the nested Fermi surface. In the presence of a perfectly nested Fermi surface, the required coupling strength may be inf...

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“…The ratio ρ ab (300 K)/ρ ab (7.5 K) = 43, is close to the ones found in the best crystals. 15 The inplane electronic mean free path close to T C0 , ℓ ab ≈ 1830 A, was estimated from the in-plane residual resistivity and from the carriers concentration 15 by using a Drudemodel relation. The resistivity anisotropy is found to be ρ c /ρ ab ∼ 10 2 , which leads to an electronic mean free path in the c direction of ℓ c ∼ 20Å.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

In-plane and transverse superconducting fluctuation diamagnetism in the presence of charge-density waves in2H−NbSe2single crystals

et al. 2007

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The fluctuation-diamagnetism (FD) above the superconducting transition was measured in 2H-NbSe2 single crystals. The moderate uniaxial anisotropy of this compound, and some experimental improvements, allowed to measure the superconducting fluctuation effects in the two main crystallographic directions. These results reveal that the nonlocal electrodynamic effects on the FD are highly anisotropic, and they also discard a possible contribution to the FD coming from the charge-density waves (CDW) appearing below TCDW > TC in 2H-NbSe2, in agreement with a phenomenological estimate.

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The Low-Temperature Transport Properties of NbSe2

Abstract: The resistivity and Hall effect of single crystals of the two-layer structure of NbSe2 were measured from about 5° to 300°K. A sign change was observed in the Hall coefficient at about 26°K; above this temperature the samples were p type, and below, n type.

Cited by 92 publications

References 10 publications

Superconducting ferecrystals: turbostratically disordered atomic-scale layered (PbSe)1.14(NbSe2)n thin films

Superconducting ferecrystals: turbostratically disordered atomic-scale layered (PbSe)1.14(NbSe2)n thin films

Incommensurate antiferromagnetism in a pure spin system via cooperative organization of local and itinerant moments

In-plane and transverse superconducting fluctuation diamagnetism in the presence of charge-density waves in2H−NbSe2single crystals

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