Model for the neutron resonance in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>HgBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Montiel, X.; Pépin, C.

doi:10.1103/physrevb.96.094529

Cited by 8 publications

(7 citation statements)

References 79 publications

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“…The pseudogap phase is then the phase in which the composite order parameter has a finite length but fluctuates between the two states. It was shown to agree with a range of experimental responses, including ARPES [38], Raman scattering [39], inelastic neutron scattering [40], transport measurements [41] and high magnetic field studies [42].…”

Section: Introductionmentioning

confidence: 75%

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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Section: Introductionmentioning

confidence: 75%

Collective mode in the SU(2) theory of cuprates

2018

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“…Fluctuations associated with this symmetry are described by a non linear sigma model. 66 This SU(2) theory is successful in describing some of the phenomenological aspects [67][68][69][70][71][72] of the much debated pseudogap phase. A similar non linear sigma model describing the fluctuating CO and SC was also studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of the underdoped cuprates at high magnetic field

2018

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The experimentally measured phase diagram of cuprate superconductors in the temperature-applied magnetic field plane illuminates key issues in understanding the physics of these materials. At low temperature, the superconducting state gives way to a long-range charge order with increasing magnetic field; both the orders coexist in a small intermediate region. The charge order transition is strikingly insensitive to temperature, and quickly reaches a transition temperature close to the zero-field superconducting Tc. We argue that such a transition along with the presence of the coexisting phase cannot be described simply by a competing orders formalism. We demonstrate that for some range of parameters there is an enlarged symmetry of the strongly coupled charge and superconducting orders in the system depending on their relative masses and the coupling strength of the two orders. We establish that this sharp switch from the superconducting phase to the charge order phase can be understood in the framework of a composite SU(2) order parameter comprising the charge and superconducting orders. Finally, we illustrate that there is a possibility of the coexisting phase of the competing charge and superconducting orders only when the SU(2) symmetry between them is weakly broken due to biquadratic terms in the free energy. The relation of this sharp transition to the proximity to the pseudogap quantum critical doping is also discussed. arXiv:1802.10122v1 [cond-mat.supr-con]

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“…So, one-electron experimental probes, such as angle-resolved photoemission spectroscopy (ARPES) or scanning tunneling spectroscopy (STS), will not detect the induced PDW. However, twoelectron response functions, will have signatures of these PDW correlations, [129][130][131][132][133] and even be able to distinguish oddfrequency components. For example, the imaginary part of the density response function χ (q, Ω) can characterize various bosonic excitations or correlations at different momentum (q) and energies or frequencies (Ω) depending on the experimental probe.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Odd-frequency pair density wave correlations in underdoped cuprates

Chakraborty,

Black-Schaffer

2020

Preprint

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Pair density waves, identified by Cooper pairs with finite center-of-mass momentum, have recently been observed in copper oxide based high Tc superconductors (cuprates). A charge density modulation or wave is also ubiquitously found in underdoped cuprates. Within a general mean-field one-band model we show that the coexistence of charge density waves and superconductivity in d-wave superconductors like cuprates, generates an odd-frequency spin-singlet pair density wave, in addition to the even-frequency counterparts. The strength of the induced odd-frequency pair density wave depends on the modulation wave vector of the charge density wave, with the odd-frequency pair density waves even becoming comparable to the even-frequency ones in parts of the Brillouin zone. The odd-frequency component of the pair density waves also gets enhanced when the charge density wave is uni-axial. Such a coexistence of superconductivity and uni-axial charge density wave has already been experimentally verified at high magnetic fields in underdoped cuprates. We further discuss the possibility of an odd-frequency spin-triplet pair density wave generated in the coexistence regime of superconductivity and spin density waves, applicable to the iron-based superconductors. Our work thus presents a route to bulk odd-frequency superconductivity in high Tc superconductors.

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Model for the neutron resonance in HgBa2CuO4+δ

Cited by 8 publications

References 79 publications

Collective mode in the SU(2) theory of cuprates

Collective mode in the SU(2) theory of cuprates

Phase diagram of the underdoped cuprates at high magnetic field

Odd-frequency pair density wave correlations in underdoped cuprates

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