scholarly journals Orbital symmetries of charge density wave order in YBa2Cu3O6+x

2020 ◽  
Vol 6 (45) ◽  
pp. eaay0345
Author(s):  
Christopher McMahon ◽  
A. J. Achkar ◽  
E. H. da Silva Neto ◽  
I. Djianto ◽  
J. Menard ◽  
...  
Keyword(s):  
Form Factor ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Charge Order ◽  
Orbital Symmetry ◽  
Pronounced Difference ◽  
Enhanced Sensitivity ◽  
X Ray Scattering ◽  
Underdoped Cuprates

Charge density wave (CDW) order has been shown to compete and coexist with superconductivity in underdoped cuprates. Theoretical proposals for the CDW order include an unconventional d-symmetry form factor CDW, evidence for which has emerged from measurements, including resonant soft x-ray scattering (RSXS) in YBa2Cu3O6+x (YBCO). Here, we revisit RSXS measurements of the CDW symmetry in YBCO, using a variation in the measurement geometry to provide enhanced sensitivity to orbital symmetry. We show that the (0 0.31 L) CDW peak measured at the Cu L edge is dominated by an s form factor rather than a d form factor as was reported previously. In addition, by measuring both (0.31 0 L) and (0 0.31 L) peaks, we identify a pronounced difference in the orbital symmetry of the CDW order along the a and b axes, with the CDW along the a axis exhibiting orbital order in addition to charge order.

Dynamics in the charge-density-wave systemNbSe3using inelastic x-ray scattering with meV energy resolution

2002 ◽  
Vol 66 (21) ◽  
Author(s):  
H. Requardt ◽  
J. E. Lorenzo ◽  
P. Monceau ◽  
R. Currat ◽  
M. Krisch
Keyword(s):  
Charge Density ◽  
Energy Resolution ◽  
Charge Density Wave ◽  
Density Wave ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Anomalous relaxation kinetics and charge-density-wave correlations in underdoped BaPb1−xBixO3

2017 ◽  
Vol 114 (34) ◽  
pp. 9020-9025 ◽  
Author(s):  
D. Nicoletti ◽  
E. Casandruc ◽  
D. Fu ◽  
P. Giraldo-Gallo ◽  
I. R. Fisher ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Short Range ◽  
Density Wave ◽  
Charge Order ◽  
Optical Excitation ◽  
Constant Density ◽  
Similar Response ◽  
Free Energy Barrier ◽  
Relaxation Kinetics

Superconductivity often emerges in proximity of other symmetry-breaking ground states, such as antiferromagnetism or charge-density-wave (CDW) order. However, the subtle interrelation of these phases remains poorly understood, and in some cases even the existence of short-range correlations for superconducting compositions is uncertain. In such circumstances, ultrafast experiments can provide new insights by tracking the relaxation kinetics following excitation at frequencies related to the broken-symmetry state. Here, we investigate the transient terahertz conductivity of BaPb1−xBixO3––a material for which superconductivity is “adjacent” to a competing CDW phase––after optical excitation tuned to the CDW absorption band. In insulating BaBiO3 we observed an increase in conductivity and a subsequent relaxation, which are consistent with quasiparticles injection across a rigid semiconducting gap. In the doped compound BaPb0.72Bi0.28O3 (superconducting below TC = 7 K), a similar response was also found immediately above TC. This observation evidences the presence of a robust gap up to T≃ 40 K, which is presumably associated with short-range CDW correlations. A qualitatively different behavior was observed in the same material for T≳ 40 K. Here, the photoconductivity was dominated by an enhancement in carrier mobility at constant density, suggestive of melting of the CDW correlations rather than excitation across an optical gap. The relaxation displayed a temperature-dependent, Arrhenius-like kinetics, suggestive of the crossing of a free-energy barrier between two phases. These results support the existence of short-range CDW correlations above TC in underdoped BaPb1−xBixO3, and provide information on the dynamical interplay between superconductivity and charge order.

scholarly journals X-ray-scattering measurements of the transient structure of a driven charge-density wave

1994 ◽  
Vol 50 (12) ◽  
pp. 8157-8165 ◽  
Author(s):  
E. Sweetland ◽  
A. C. Finnefrock ◽  
W. J. Podulka ◽  
M. Sutton ◽  
J. D. Brock ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Measurements ◽  
Transient Structure ◽  
Ray Scattering

scholarly journals Interplay between unidirectional and bidirectional charge-density-wave orders in underdoped cuprates

2015 ◽  
Vol 92 (24) ◽  
Author(s):  
Yuxuan Wang ◽  
Andrey V. Chubukov
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Underdoped Cuprates

High-resolution x-ray-scattering study of charge-density-wave modulation in chromium

1988 ◽  
Vol 37 (1) ◽  
pp. 562-564 ◽  
Author(s):  
Doon Gibbs ◽  
K. M. Mohanty ◽  
Jakob Bohr
Keyword(s):  
High Resolution ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
X Ray ◽  
Wave Modulation ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

Friedel oscillations and charge density wave pinning in quasi-one dimensional conductors: Thermal effects

2002 ◽  
Vol 12 (9) ◽  
pp. 9-14
Author(s):  
J.-P. Pouget ◽  
S. Ravy ◽  
S. Rouziere ◽  
S. Brazovskii
Keyword(s):  
Charge Density ◽  
Interference Effect ◽  
Charge Density Wave ◽  
Density Wave ◽  
Thermal Dependence ◽  
One Dimensional ◽  
X Ray ◽  
Friedel Oscillations ◽  
X Ray Scattering ◽  
Ray Scattering

An original interference effect observed in one-dimensional (1D) disordered conductors between X-ray scattering due to the disorder and the charge density wave (CDW)- periodic lattice modulation (PLD) allows to study the pinning of the modulation at local scale. We apply this effect to determine the phase of the CDW at the pinning centres and to show that the response of the CDW to the impurity potential leads to the formation of Friedel oscillations (FO). We report experimental determination and quantitative interpretation of the thermal evolution of both features. The thermal dependence of the interference effect allows one to determine the pinning energy of the 2kF-CDW in the V-and W-doped blue bronzes. We show in particular that in these compounds the regular CDW is pinned to the dopant dressed by its FO. In the organic charge transfer salts irradiation leads to an enhancement of the 2kF and 4kF X-ray scattering that we show, by its thermal dependence, to be due to the formation of FO.

Charge density wave formation in the low-temperature-tetragonal phase of cuprates

2002 ◽  
Vol 12 (9) ◽  
pp. 251-251
Author(s):  
C. Morais Smith ◽  
N. Hasselmann ◽  
A. H. Castro Neto
Keyword(s):  
Low Temperature ◽  
Charge Density ◽  
Tetragonal Phase ◽  
Charge Density Wave ◽  
Density Wave ◽  
Charge Order ◽  
High Tc ◽  
A Charge ◽  
High Tc Cuprates ◽  
Shed Light

We calculate the influence of transverse fluctuations on the longitudinal dynamics in the striped phase of cuprates by using the bosonization technique. We find that a charge density wave instability can arise if the stripe is quarter filled and the underlying lattice potential has a zig-zag symmetry. Our results shed light on the as yet not understood connection between the formation of a low temperature tetragonal phase and the subsequent appearance of charge order in high-Tc cuprates.

scholarly journals Charge-density-wave orderings inLaAgSb2:An x-ray scattering study

2003 ◽  
Vol 68 (3) ◽  
Author(s):  
C. Song ◽  
Jaehyun Park ◽  
Japil Koo ◽  
K.-B. Lee ◽  
J. Y. Rhee ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

scholarly journals X-ray scattering on charge-density-wave superconductor 2H-NbSe2

2009 ◽  
Vol 150 (4) ◽  
pp. 042029 ◽  
Author(s):  
V Eremenko ◽  
V Sirenko ◽  
V Ibulaev ◽  
M Shvedun ◽  
G Andre
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering
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