Dispersion, damping, and intensity of spin excitations in the monolayer 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mtext>Bi,Pb</mml:mtext><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mtext>Sr,La</mml:mtext><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:m

Peng, Yingying; Huang, Edwin W.; Fumagalli, R.; Minola, M.; Wang, Yao; Sun, Xuan; Ding, Ying; Kummer, K.; Zhou, Xianju; Brookes, N. B.; Moritz, Brian; Braicovich, L.; Devereaux, T. P.; Ghiringhelli, G.

doi:10.1103/physrevb.98.144507

Cited by 61 publications

(53 citation statements)

References 55 publications

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“…The observed doping dependence is consistent with spin dilution in a Mott insulator. This is in fact different from those observed in cuprates, in which the mode energy and spectral weight do not decrease with increasing doping [99]. The doping dependence of the magnetic excitations in cuprates has been attributed to the longer-range charge dynamics emergent with increasing hole doping, for example, the three site terms in a Hubbard model [100,101].…”

Section: Magnetic Excitations In Infinite-layer Nickelatescontrasting

confidence: 57%

Soft X-Ray Spectroscopy of Low-Valence Nickelates

2021

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Low-valence nickelates—including infinite-layer (IL) and trilayer (TL) compounds—are longstanding candidates for mimicking the high-temperature superconductivity of cuprates. A recent breakthrough in the field came with the discovery of superconductivity in hole-doped IL nickelates. Yet, the degree of similarity between low-valence nickelates and cuprates is the subject of a profound debate for which soft x-ray spectroscopy experiments at the Ni L- and O K-edge provided critical input. In this review, we will discuss the essential elements of the electronic structure of low-valance nickelates revealed by x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS). Furthermore, we will review magnetic excitations observed in the RIXS spectra of IL and TL nickelates, which exhibit characteristics that are partly reminiscent of those of cuprates.

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Section: Magnetic Excitations In Infinite-layer Nickelatescontrasting

confidence: 57%

Soft X-Ray Spectroscopy of Low-Valence Nickelates

2021

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“…We present LH data from the grazing-out orientation where the single magnon intensity is favoured 31,32 . Recent experiments with polarisation analysis 33 have established that this configuration is primarily sensitive to magnetic scattering. Samples were mounted on the sample holder in ultra-high vacuum and cooled to T 20 K. Magnetic excitations in doped cuprates are dispersive predominantly in the a-b plane of LSCO, allowing paths to be measured in the (h, k) plane by varying the sample orientation, and keeping the scattering angle 2θ fixed at 146 • and 149.5 • for I21 and ID32 respectively.…”

Section: Spectrometersmentioning

confidence: 99%

“…A damped harmonic oscillator (DHO) model may be used to describe a given spin-wave mode with wave vector Q. This approach has recently been taken in a number of RIXS studies 11,13,33,38 . The analogous mechanical DHO equation is 39ẍ…”

Section: Damped Harmonic Oscillator Modelmentioning

confidence: 99%

Anisotropic damping and wave vector dependent susceptibility of the spin fluctuations in La2−xSrxCuO4 studied by resonant inelastic x-ray scattering

et al. 2019

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We report high-resolution resonant inelastic x-ray scattering (RIXS) measurements of the collective spin fluctuations in three compositions of the superconducting cuprate system La2−xSrxCuO4. We have mapped out the excitations throughout much of the 2-D (h, k) Brillouin zone. The spin fluctuations in La2−xSrxCuO4 are found to be fairly well-described by a damped harmonic oscillator model, thus our data allows us to determine the full wavevector dependence of the damping parameter. This parameter increases with doping and is largest along the (h, h) line, where it is peaked near (0.2, 0.2). We have used a new procedure to determine the absolute wavevector-dependent susceptibility for the doped compositions La2−xSrxCuO4 (x = 0.12, 0.16) by normalising our data to La2CuO4 measurements made with inelastic neutron scattering (INS). We find that the evolution with doping of the intensity of high-energy excitations measured by RIXS and INS is consistent. For the doped compositions, the wavevector-dependent susceptibility is much larger at ( 1 4 , 1 4 ) than at ( 1 2 , 0). It increases rapidly along the (h, h) line towards the antiferromagnetic wavevector of the parent compound ( 1 2 , 1 2 ). Thus, the strongest magnetic excitations, and those predicted to favour superconductive pairing, occur towards the ( 1 2 , 1 2 ) position as observed by INS.

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“…What is missing is a spectroscopic analysis. Resonant inelastic x-ray scattering is ideally suited for this purpose, as it probes the crystal field (dd) excitations that are related to local coordination of the Cu ions [8][9][10], and the spin excitations (paramagnons) [11][12][13][14][15], whose dispersion is linked to the in-plane superexchange interaction. The latter is particularly significant for ultrathin films: is the antiferromagnetic short and medium range order preserved also in the single unit cell limit, where only 2 CuO 2 planes are present, or is the quasi-perfect two-dimensionality of the system an obstacle to such order?…”

Section: Introductionmentioning

confidence: 99%

Structural, Electronic and Magnetic Properties of a Few Nanometer-Thick Superconducting NdBa2Cu3O7 Films

et al. 2020

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Epitaxial films of high critical temperature ( T c ) cuprate superconductors preserve their transport properties even when their thickness is reduced to a few nanometers. However, when approaching the single crystalline unit cell (u.c.) of thickness, T c decreases and eventually, superconductivity is lost. Strain originating from the mismatch with the substrate, electronic reconstruction at the interface and alteration of the chemical composition and of doping can be the cause of such changes. Here, we use resonant inelastic x-ray scattering at the Cu L 3 edge to study the crystal field and spin excitations of NdBa 2 Cu 3 O 7 − x ultrathin films grown on SrTiO 3 , comparing 1, 2 and 80 u.c.-thick samples. We find that even at extremely low thicknesses, the strength of the in-plane superexchange interaction is mostly preserved, with just a slight decrease in the 1 u.c. with respect to the 80 u.c.-thick sample. We also observe spectroscopic signatures for a decrease of the hole-doping at low thickness, consistent with the expansion of the c-axis lattice parameter and oxygen deficiency in the chains of the first unit cell, determined by high-resolution transmission microscopy and x-ray diffraction.

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Dispersion, damping, and intensity of spin excitations in the monolayer (Bi,Pb)2(Sr,La)2CuO6+δ

Cited by 61 publications

References 55 publications

Soft X-Ray Spectroscopy of Low-Valence Nickelates

Soft X-Ray Spectroscopy of Low-Valence Nickelates

Anisotropic damping and wave vector dependent susceptibility of the spin fluctuations in La2−xSrxCuO4 studied by resonant inelastic x-ray scattering

Structural, Electronic and Magnetic Properties of a Few Nanometer-Thick Superconducting NdBa2Cu3O7 Films

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