Probing the lattice anharmonicity of superconducting 
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 via phonon harmonics

Ramos-Álvarez, A.; Fleischmann, Nina; Vidas, Luciana; Fernández‐Rodríguez, Alejandro; Palau, Anna; Wall, Simon

doi:10.1103/physrevb.100.184302

Cited by 9 publications

(13 citation statements)

References 27 publications

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“…4(e)]. The redshift in the wavelength maxima is an indicator that the 146 cm -1 mode shifts the charge transfer resonance that dominates the spectral window, as previously observed for the analogous mode in bilayer cuprates [27]. The mode amplitude saturation at moderate fluences is in good agreement with the saturation of the magnetic signal observed in Fig.…”

Section: Tracking the Lattice Degree Of Freedomsupporting

confidence: 86%

“…Both temperatures show a suppressed reflectivity at short wavelengths and an increase > ∼600 nm (see lineouts on the top panel) consistent with a photo-induced shift in the O 2p-Ir 5d charge transfer resonance [red line in Fig. 1(b)], like what is seen in the cuprates [27]. Moreover, both temperatures exhibit fast dynamics within the first picosecond, followed by a much slower plateau.…”

Section: Temperature and Light-induced Changes In Reflectivitysupporting

confidence: 64%

“…This agrees with the strong coupling of the mode to visible wavelengths, which probe the charge transfer resonance. Activation of this mode has strong implications for functionality control as, for example, in cuprates, the charge transfer is known to correlate with the superconductive state [27]. Specifically, for iridates, in our experiments, charge excitation shifts the phonon equilibrium position and quenches magnetization depending on the density of spin vacancies generated.…”

Section: Discussionmentioning

confidence: 69%

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Nonthermal breaking of magnetic order via photogenerated spin defects in the spin-orbit coupled insulator Sr3Ir2O7

et al. 2022

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In many strongly correlated insulators, antiferromagnetic order competes with exotic and technologically relevant phases, like superconductivity. While control of spin order is critical to stabilize different functional states, elucidating the mechanism of laser-induced demagnetization in complex oxides remains a challenge. It is unknown if the optical pulse can quench magnetization nonthermally or if it instead only acts as a heat source. Here, we use ultrafast, broadband, optical spectroscopy to track the responses of the electronic, lattice, and spin degrees of freedom and their relation to antiferromagnetism in the strongly spin-orbit coupled insulator Sr 3 Ir 2 O 7 . We find that magnetization can be rapidly and strongly suppressed on a sub-150 fs timescale. At low excitation fluences, the magnetic recovery is fast; however, the recovery time increases dramatically with the magnitude of demagnetization. At the same time, we show that the lattice, evidenced through the A g phonon frequencies, appears to remain below T N , suggesting that the system remains nonthermal during the optical modulation of spin order. We suggest that photogenerated spin defects are responsible for the long-lived demagnetized state and discuss its implications for optical control of solids.

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Section: Tracking the Lattice Degree Of Freedomsupporting

confidence: 86%

Section: Temperature and Light-induced Changes In Reflectivitysupporting

confidence: 64%

Section: Discussionmentioning

confidence: 69%

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Nonthermal breaking of magnetic order via photogenerated spin defects in the spin-orbit coupled insulator Sr3Ir2O7

et al. 2022

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“…6,7,12–14 It is widely accepted that even though electron–phonon coupling could induce high- T c superconductivity, the cuprates are still believed not to be determined as phonon-mediated. 13–25…”

Section: Introductionmentioning

confidence: 99%

“…6,7,[12][13][14] It is widely accepted that even though electron-phonon coupling could induce high-T c superconductivity, the cuprates are still believed not to be determined as phonon-mediated. [13][14][15][16][17][18][19][20][21][22][23][24][25] Machine learning (ML) has become an essential data-driven research approach that has been rapidly developed in recent years. 26 In contrast to traditional methods, ML does not rely on the development of any prior physical knowledge (e.g., Debye temperature or phonon dynamics properties) 27 but utilizes data to explore the physical rules, showing outstanding performances in scientic research and industrial design.…”

Section: Introductionmentioning

confidence: 99%

Cuprate superconducting materials above liquid nitrogen temperature from machine learning

Wang

Cui

et al. 2023

RSC Adv.

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Effects of li doping on superconducting properties of citrate-gel prepared Y1–xLixBa2Cu3O7–δ Compound

Amiri–Moghadam

Gashmard²,

Hosseini³

et al. 2022

Appl. Phys. A

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The Y 1-x Li x Ba 2 Cu 3 O 7-δ polycrystalline bulk superconductors doped with Li substituting at the Y site at different concentrations (x = 0, 0.01, 0.02, 0.1) were prepared using the citrate-gel method to study the effects of doping on the superconducting temperature and critical current density. The question was whether Li addition characterized by a high Debye frequency would have any positive effects on T c . The optimum citrate-gel and heat treatment conditions were identified as those yielding samples with a maximum grain size on the order of 50 μm (up to the optimum Li doping level, x = 0.01). Li substitution at the Y site was verified by structural, electrical, and magnetic measurements of the produced samples, whereas X-ray diffraction (XRD) analysis revealed the formation of a pure phase with no visible impurity phases. Moreover, AC magnetic susceptibility measurements showed no increase in the superconducting transition temperature T c , consistent with the predicted results obtained by machine learning method, although it was theoretically expected to increase owing to the high Debye frequency of Li. This observation is consistent with magnetic coupling models for pairing mechanism in cuprates. Finally, because of the optimum conditions of the preparation procedure, nearly identical values of the critical current density (J c ) were recorded for samples with different Li doping levels (up to the optimum Li doping level). It was found that improved compound preparation conditions would have a critical and extensive effect on J c enhancement, with nearly no T c suppression.

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Probing the lattice anharmonicity of superconducting YBa2Cu3O7−δ via phonon harmonics

Cited by 9 publications

References 27 publications

Nonthermal breaking of magnetic order via photogenerated spin defects in the spin-orbit coupled insulator Sr3Ir2O7

Nonthermal breaking of magnetic order via photogenerated spin defects in the spin-orbit coupled insulator Sr3Ir2O7

Cuprate superconducting materials above liquid nitrogen temperature from machine learning

Effects of li doping on superconducting properties of citrate-gel prepared Y1–xLixBa2Cu3O7–δ Compound

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