Phase diagram of the underdoped cuprates at high magnetic field

Chakraborty, Debmalya; Morice, Corentin; Pépin, C.

doi:10.1103/physrevb.97.214501

Cited by 21 publications

(23 citation statements)

References 130 publications

(202 reference statements)

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“…140,145,161,168,169 There is substantial evidence that the competition between the d-SC and d-CDW is not of the usual Ginzburg Landau type with two independent energy scales. 170 Experiments also indicate a near degeneracy of the two orders through: (a) Similarity of T 3D co (transition temperature of high field 3D uniaxial long-range charge order 30,31,171 ) and T c . (b) Closeness of the pair breaking peaks in B 2g and B 1g Raman response.…”

Section: Competing Order Scenariosmentioning

confidence: 98%

Fractionalized pair density wave in the pseudogap phase of cuprate superconductors

et al. 2019

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The mysterious pseudo-gap (PG) phase of cuprate superconductors has been the subject of intense investigation over the last thirty years, but without a clear agreement about its origin. Owing to a recent observation in Raman spectroscopy, of a precursor in the charge channel, on top of the well known fact of a precursor in the superconducting channel, we present here a novel idea: the PG is formed through a Higgs mechanism, where two kinds of preformed pairs, in the particle-particle and particle-hole channels, become entangled through a freezing of their global phase. Remarkably, this entanglement is equivalent to fractionalizing a bond Cooper pair density wave (PDW) into its elementary parts; the particle-hole pair, giving rise to both density modulations and current modulations, and the particle-particle counterpart, leading to the formation of Cooper pairs. From this perspective, the "fractionalized PDW" becomes the central object around the formation of the pseudo-gap. The "locking" of phases between the charge and superconducting modes gives a unique explanation for the unusual global phase coherence of short-range charge modulations, observed below Tc on phase sensitive scanning tunneling microscopy (STM). A simple microscopic model enables us to estimate the mean-field values of the precursor gaps in each channel and the PG energy scale, and to compare them to the values observed in Raman scattering spectroscopy. We also discuss the possibility of a multiplicity of orders in the PG phase and give an overview of the phase diagram. arXiv:1906.01633v2 [cond-mat.supr-con]

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Section: Competing Order Scenariosmentioning

confidence: 98%

Fractionalized pair density wave in the pseudogap phase of cuprate superconductors

et al. 2019

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“…As such, it is a signature of the SU(2) order parameter. In the case where the two phases coexist, the η mode, which corresponds to a PDW, condenses and forms an ordered PDW state showing supersolidity [42].…”

Section: Non-linear σ-Modelmentioning

confidence: 99%

“…at low temperature it will lay in the n 1 -n 3 plane. The mass of the superconducting coordinates is renormalised by applied magnetic field [42], which eventually will make it equal to the mass of the charge order coordinate. Beyond this point, the system will prefer charge order at low temperature: there is a spin-flop transition from the superconducting "easy plane" to charge order.…”

Section: Non-linear σ-Modelmentioning

confidence: 99%

Collective mode in the SU(2) theory of cuprates

2018

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Recent advances in momentum-resolved electron energy-loss spectroscopy (MEELS) and resonant inelastic X-ray scattering (RIXS) now allow one to access the charge response function with unprecedented versatility and accuracy. This allows for the study of excitations which were inaccessible recently, such as low-energy and finite momentum collective modes. The SU(2) theory of the cuprates is based on a composite order parameter with SU(2) symmetry fluctuating between superconductivity and charge order. The phase where it fluctuates is a candidate for the pseudogap phase of the cuprates. This theory has a signature, enabling its strict experimental test, which is the fluctuation between these two orders, corresponding to a charge 2 spin 0 mode at the charge ordering wave-vector. Here we derive the influence of this SU(2) collective mode on the charge susceptibility in both strong and weak coupling limits, and discuss its relation to MEELS, RIXS and Raman experiments. We find two peaks in the charge susceptibility at finite energy, whose middle is the charge ordering wave-vector, and discuss their evolution in the phase diagram.

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“…We believe the results reported in this publicationwhich are unique given the considerable computational effort involved that requires robust computational resources -will encourage further theoretical and experimental investigations on fractionally-filled iridates [75][76][77][78][79] and also on other quasi-one dimensional materials with large spin-orbit coupling. While our model calculations cannot establish which precise material will realize the novel phase unveiled, we believe from now on the block condensate has to be considered among the candidate states when n = 3.5 materials are studied.…”

Section: Discussionmentioning

confidence: 99%

Block excitonic condensate at n=3.5 in a spin-orbit coupled t2g multiorbital Hubbard model

Kaushal¹,

Nocera²,

Álvarez³

et al. 2019

Phys. Rev. B

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Theoretical studies recently predicted the condensation of spin-orbit excitons at momentum q=π in t 4 2g spin-orbit coupled three-orbital Hubbard models at electronic density n = 4. In parallel, experiments involving iridates with non-integer valence states for the Ir ions are starting to attract considerable attention. In this publication, using the density matrix renormalization group technique we present evidence for the existence of a novel excitonic condensate at n = 3.5 in a one-dimensional Hubbard model with a degenerate t2g sector, when in the presence of spin-orbit coupling. At intermediate Hubbard U and spin-orbit λ couplings, we found an excitonic condensate at the unexpected momentum q=π/2 involving j eff = 3/2, m = ±1/2 and j eff = 1/2, m = ±1/2 bands in the triplet channel, coexisting with an also unexpected block magnetic order. We also present the entire λ vs U phase diagram, at a fixed and robust Hund coupling. Interestingly, this new "block excitonic phase" is present even at large values of λ, unlike the n = 4 excitonic phase discussed before. Our computational study helps to understand and predict the possible magnetic phases of materials with d 3.5 valence and robust spin-orbit coupling.arXiv:1901.05578v1 [cond-mat.str-el]

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Phase diagram of the underdoped cuprates at high magnetic field

Cited by 21 publications

References 130 publications

Fractionalized pair density wave in the pseudogap phase of cuprate superconductors

Fractionalized pair density wave in the pseudogap phase of cuprate superconductors

Collective mode in the SU(2) theory of cuprates

Block excitonic condensate at n=3.5 in a spin-orbit coupled t2g multiorbital Hubbard model

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