STM evidence of room-temperature charge instabilities in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Prodan, A.; Ramšak, N.; Marinković, V.; Hla, Saw‐Wai; Boswell, F.W.; Bennett, J.C.; Böhm, Horst

doi:10.1103/physrevb.54.10370

Cited by 8 publications

(3 citation statements)

References 48 publications

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“…Such pictures were obtained for many systems, for example layered dichalcogenides 1T -TaS 2−x Se x [246,247] and 2H -NbSe 2 [248], quasi-1D NbTe 4 [249], NbSe 3 [211,250], as well as for the high-T c oxide YBa 2 Cu 3 O 7−y [251][252][253][254]. At the same time the application Figure 1.…”

Section: Cdw Superconductorsmentioning

confidence: 93%

Charge- and spin-density-wave superconductors

Gabovich

Войтенко

Annett

et al. 2001

Supercond. Sci. Technol.

171

147

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This review deals with the properties of superconductors with competing electron spectrum instabilities, namely, charge-density waves (CDWs) and spin-density waves (SDWs). The underlying reasons of the electron spectrum instability may be either Fermi surface nesting or the existence of Van Hove saddle points for lower dimensionalities. CDW superconductors include layered dichalcogenides, NbSe 3 , and compounds with the A15 and C15 structures among others. There is much evidence to show that high-T c oxides may also belong to this group of materials. The SDW superconductors include URu 2 Si 2 and related heavy-fermion compounds, Cr-Re alloys and organic superconductors. We review the experimental evidence for CDW and SDW instabilities in a wide range of different superconductors, and assess the competition between these instabilities of the Fermi surface and the superconducting gap. Issues concerning the superconducting order parameter symmetry are also touched upon. The accent is put on establishing a universal framework for further theoretical discussions and experimental investigations based on an extensive list of available and up-to-date references.

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Section: Cdw Superconductorsmentioning

confidence: 93%

Charge- and spin-density-wave superconductors

Gabovich

Войтенко

Annett

et al. 2001

Supercond. Sci. Technol.

171

147

View full text Add to dashboard Cite

show abstract

“…Before our present work only one STM experiment was performed under UHV conditions, but at room temperature, i.e., in the normal state. 21 In this study, we have investigated both q 1 and q 2 charge density wave states taking place in NbSe 3 , in the temperature range between 5 and 140 K, by low-temperature scanning tunneling microscopy under ultrahigh vacuum on the in situ cleaved ͑b , c͒ surface. A preliminary report of the STM images at 5 K appeared.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1and
Brun
¹
,
Wang
²
,
Monçeau
³

2009
Phys. Rev. B

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We have investigated both q 1 and q 2 charge density wave ͑CDW͒ states taking place in NbSe 3 by means of low-temperature scanning tunneling microscopy ͑STM͒ under ultrahigh vacuum on the in situ cleaved ͑b , c͒ surface. High-resolution topographical images with atomic lattice resolution were obtained in the temperature range between 5 and 140 K. The careful and thorough analysis of the dependence of the STM images on bias polarity, energy, and temperature allowed us to identify unambiguously the three different types of chains composing the NbSe 3 unit cell at all temperatures, resolving contradictions from previous STM results. From two-dimensional Fourier transform of the STM images, we show that at the surface plane both CDW's wave vectors are in very good agreement with bulk reported values projected on the ͑b , c͒ plane. The q 1 CDW has, for wave vector, q 1 = 0.24b ‫ء‬ . Spatially, the q 1 modulation is essentially developed on type III chains with a weak contribution on type II neighboring chains. The q 2 CDW has, for wave vector, the projected value q 2p = 0.26b ‫ء‬ + 0.5c ‫ء‬ . This modulation is mainly developed on type I chains but surprisingly has an important contribution on type III chains with an amplitude similar to the q 1 contribution on these chains. This simultaneous double modulation on chain III leads to a beating phenomenon between the q 1 and q 2p periodicities and gives rise to a new domain superstructure developed along the chain axis which is characterized by the vector u =2ϫ ͑q 2p − q 1 ͒ − c ‫ء‬ =2ϫ ͑0.26− 0.24͒b ‫ء‬ . We believe that these new features give a clue of the coupling between the q 1 and q 2 CDWs in the pinned regime. Whereas most studies investigated the various characteristics of both CDWs by probing the Nb atoms properties, our results are consistent with the interpretation according to which the electronic local density of states probed by STM is mostly that of the surface Se atoms.

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“…3b (see Supplemental Material for details including Refs. [30][31][32]). The CDW potential opens gaps at momenta connected by the ordering vectors.…”

mentioning

confidence: 99%

Dimensional Crossover in a Charge Density Wave Material Probed by Angle-Resolved Photoemission Spectroscopy

et al. 2017

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High-resolution angle-resolved photoemission spectroscopy data reveal evidence of a crossover from one-dimensional (1D) to three-dimensional (3D) behavior in the prototypical charge density wave (CDW) material NbSe 3 . In the low-temperature 3D regime, gaps in the electronic structure are observed due to two incommensurate CDWs, in agreement with x-ray diffraction and electronic-structure calculations. At higher temperatures we observe a spectral weight depletion that approaches the power-law behavior expected in one dimension. From the warping of the quasi-1D Fermi surface at low temperatures, we extract the energy scale of the dimensional crossover. This is corroborated by a detailed analysis of the density of states, which reveals a change in dimensional behavior dependent on binding energy. Our results offer an important insight into the dimensionality of excitations in quasi-1D materials.

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STM evidence of room-temperature charge instabilities inNbSe3

Cited by 8 publications

References 48 publications

Charge- and spin-density-wave superconductors

Charge- and spin-density-wave superconductors

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1and
Brun
¹
,
Wang
²
,
Monçeau
³

2009
Phys. Rev. B

Dimensional Crossover in a Charge Density Wave Material Probed by Angle-Resolved Photoemission Spectroscopy

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STM evidence of room-temperature charge instabilities inNbSe3

Cited by 8 publications

References 48 publications

Charge- and spin-density-wave superconductors

Charge- and spin-density-wave superconductors

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1andBrun1, Wang2, Monçeau3 2009Phys. Rev. B

Dimensional Crossover in a Charge Density Wave Material Probed by Angle-Resolved Photoemission Spectroscopy

Contact Info

Product

Resources

About

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1and
Brun
¹
,
Wang
²
,
Monçeau
³

2009
Phys. Rev. B