Magnetic resonance in the model high-temperature superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>HgBa</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>CuO</mml:mtext></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Yu, Guichuan; Li, Y.; Motoyama, E. M.; Zhao, Xudong; Barišić, N.; Cho, Chae-Ryong; Bourgès, Philippe; Hradil, K.; Mole, R. A.; Greven, M.

doi:10.1103/physrevb.81.064518

Cited by 42 publications

(46 citation statements)

References 42 publications

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“…The resonance peak is centered at q AF and does not extend to q = 0 (momentum width consistent with those in YBCO and Tl2201, see discussion in Ref. 17). At energies above and below 56 meV, a weak signal centered at q AF is observed, which is similar to the situation near the resonance in other cuprates, and which might be the counterpart of the 'hourglass' excitations in Hg1201.…”

Section: S8 the Resonance At Q Af In Hg1201mentioning

confidence: 83%

“…The weak dispersion (<10%) and the strong response at the 2D zone center q = 0 drastically differ from the characteristics of the well-known antiferromagnetic response near q AF [14,15]. Remarkably, the dispersion of the excitation, which is already present well above T c , reaches its maximum at the same point in energy-momentum-space as the so-called magnetic resonance [16], which in OP95 clearly occurs only below T c [17]. This is further demonstrated in Fig.…”

mentioning

confidence: 93%

“…Intensity difference between low and high temperatures reveals the magnetic signal (see Ref. 17 for the raw data). A polarized measurement at this Q-position was inconclusive due to the weakness of magnetic signal.…”

Section: S5 Unpolarized Measurements Of the Dispersionmentioning

confidence: 99%

“…First, at optimal doping, the temperature dependence of the signal away from q AF (Fig. 3a) is distinctly different from that of the resonance [17] (Fig. 2a inset).…”

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confidence: 99%

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Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

Balédent

et al. 2010

Nature

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The elucidation of the pseudogap phenomenon of the cuprates, a set of anomalous physical properties below the characteristic temperature T * and above the superconducting transition temperature T c , has been a major challenge in condensed matter physics for the past two decades [1]. Following initial indications of broken time-reversal symmetry in photoemission experiments [2], recent polarized neutron diffraction work demonstrated the universal existence of an unusual magnetic order below T * [3,4]. These findings have the profound implication that the pseudogap regime constitutes a genuine new phase of matter rather than a mere crossover phenomenon. They are furthermore consistent with a particular type of order involving circulating orbital currents, and with the notion that the phase diagram is controlled by a quantum critical point [5]. Here we report inelastic neutron scattering results for HgBa 2 CuO 4+δ (Hg1201) that reveal a fundamental collective magnetic mode associated with the unusual order, and that further support this picture. The mode's intensity rises below the same temperature T * and its dispersion is weak, as expected for an Ising-like order parameter [6]. Its energy of 52-56 meV and its enormous integrated spectral weight render it a new candidate for the hitherto unexplained ubiquitous electron-boson coupling features observed in spectroscopic studies [7][8][9][10].Inelastic neutron scattering (INS) is the most direct probe of magnetic excitations in solids. In the present work, we employed both spin-polarized and unpolarized INS measurements. The use of spin-polarized neutrons was crucial to unambiguously identify the magnetic response reported here, because such neutrons are separately collected according to whether their spins have or have not been flipped in the scattering process, which renders magnetic and nuclear scattering clearly distinguishable (Supplementary Information Section 1). Our measurements were carried out on three samples made of co-aligned crystals, which were grown by a self-flux method [11] and free from substantial macroscopic impurity phases and inhomogeneity (SI Section 2). Hg1201 exhibits the highest value of T c of all cuprates with one copper-oxygen plane per unit cell, has a simple tetragonal structure, and is furthermore thought to be relatively free of disorder effects [12,13]. The scattering wave vector is quoted as Q = Ha* + Kb* + Lc* ≡ (H,K,L) in reciprocal lattice units (r.l.u.). Neutron intensities are presented in normalized units in most figures to facilitate a direct comparison of the intensity among the measurements (SI Section 3).Spin-polarized INS data ( Fig. 1) demonstrate the existence of a magnetic excitation throughout the two-dimensional (2D) Brillouin zone in a nearly-optimally-doped sample (T c = 94.5 ± 2 K, denoted as OP95). Energy scans in the spin-flip channel reveal a resolution-limited feature at low temperatures, with a weak dispersion and a maximum of 56 meV at the 2D zone-corner q AF (H = K = 0.5). The feature cannot be due to a p...

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Section: S8 the Resonance At Q Af In Hg1201mentioning

confidence: 83%

mentioning

confidence: 93%

Section: S5 Unpolarized Measurements Of the Dispersionmentioning

confidence: 99%

“…First, at optimal doping, the temperature dependence of the signal away from q AF (Fig. 3a) is distinctly different from that of the resonance [17] (Fig. 2a inset).…”

mentioning

confidence: 99%

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Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

Balédent

et al. 2010

Nature

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109

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“…This excitation is observed below the superconducting critical temperature, T c , by inelastic neutron scattering, as a strong enhancement of the spin susceptibility around the antiferromagnetic vector Q = (π/a,π/a). First discovered in YBa 2 Cu 3 O 6+x (Y-123) 17,18 at an energy s = 41 meV, it was later observed in most cuprates, including the singlelayer compounds HgBa 2 CuO 4+δ 19 and Tl 2 Ba 2 CuO 6+δ , 20 the two-layer Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212), [21][22][23] and the electrondoped material Pr 0.88 LaCe 0.12 CuO 4−δ . 24 The (π,π) resonance energy ranges from 10 to 60 meV, roughly correlated with T c as s ≈ 5.3k B T c .…”

Section: Introductionmentioning

confidence: 99%

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B

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We study a series of spectra measured in the superconducting state of optimally doped Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ (Bi-2223) by scanning tunneling spectroscopy. Each spectrum, as well as the average of spectra presenting the same gap, is fitted using a strong-coupling model taking into account the band structure, the BCS gap, and the interaction of electrons with the spin resonance. After describing our measurements and the main characteristics of the strong-coupling model, we report the whole set of parameters determined from the fits, and we discuss trends as a function of the gap magnitude. We also simulate angle-resolved photoemission spectra, and compare with recent experimental results.

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Spin Fluctuations and High-Temperature Superconductivity in Cuprates

Плакида

2014

J Supercond Nov Magn

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To describe the cuprate superconductors, models of strongly correlated electronic systems, such as the Hubbard or t-J models, are commonly employed. To study these models, projected (Hubbard) operators have to be used. Due to the unconventional commutation relations for the Hubbard operators, a specific kinematical interaction of electrons with spin and charge fluctuations emerges. The interaction is induced by the intraband hopping with a coupling parameter of the order of the kinetic energy of electrons W which is much larger than the antiferromagnetic exchange interaction J induced by the interband hopping. This review presents a consistent microscopic theory of spin excitations and superconductivity for cuprates where these interactions are taken into account within the Hubbard operator technique. The low-energy spin excitations are considered for the t-J model, while the electronic properties are studied using the two-subband extended Hubbard model where the intersite Coulomb repulsion V and electron-phonon interaction are taken into account.

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Magnetic resonance in the model high-temperature superconductorHgBa2CuO4+δ

Cited by 42 publications

References 42 publications

Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B

Spin Fluctuations and High-Temperature Superconductivity in Cuprates

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Magnetic resonance in the model high-temperature superconductorHgBa2CuO4+δ

Cited by 42 publications

References 42 publications

Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

Hidden magnetic excitation in the pseudogap phase of a high-Tc superconductor

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2CuBerthod1, Fasano2, Maggio-Aprile3 et al. 2013Phys. Rev. B

Spin Fluctuations and High-Temperature Superconductivity in Cuprates

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Product

Resources

About

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2Cu
Berthod
¹
,
Fasano
²
,
Maggio-Aprile
³

et al. 2013
Phys. Rev. B