Demonstrating the model nature of the 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>

Barišić, N.; Li, Yuan; Zhao, Xudong; Cho, Chae-Ryong; Chabot-Couture, Guillaume; Yu, Guichuan; Greven, M.

doi:10.1103/physrevb.78.054518

Cited by 73 publications

(104 citation statements)

References 43 publications

(32 reference statements)

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“…The Hg1201 single crystals used in this study were grown by a flux method [11] and heat-treated to the desired doping levels [12]. The total mosaic spread of the two primary samples, OP95 (mass ~ 2.0 g) and UD65 (~ 1.8 g), is ~2° FWHM.…”

Section: S2 Sample Preparationmentioning

confidence: 99%

“…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.).…”

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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: S2 Sample Preparationmentioning

confidence: 99%

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confidence: 99%

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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“…[3][4][5][6] However, there exists a substantial variation of VL properties among different compounds, including Bi 2. 15 . 10).…”

Section: Introductionmentioning

confidence: 99%

Magnetic vortex lattice in HgBa2CuO4+δobserved by small-angle neutron scattering

Egetenmeyer

Gavilano

et al. 2011

Phys. Rev. B

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We report the direct observation of the magnetic vortex lattice in the model high-temperature superconductor HgBa2CuO 4+δ . Using small-angle neutron scattering on high-quality crystals, we observe two equal domains of undistorted triangular vortex lattices well-aligned with the tetragonal crystallographic axes. The signal decreases rapidly with increasing magnetic field and vanishes above 0.4 Tesla, which we attribute to a crossover from a three-dimensional to a two-dimensional vortex system, similar to previous results for the more anisotropic compound Bi2.15Sr1.95CaCu2O 8+δ . Our result indicates that a triangular vortex lattice (with or without distortion) at low magnetic fields is a generic property of cuprates with critical temperatures above 80 K.

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“…We argue below that this new component is likely a generic property of all cuprates and is connected to the newly identified anisotropic susceptibility 6 . Two new HgBa 2 CuO 4+δ single crystals with T c =45 K (UN45) and 85 K (OV85) were prepared following the method described previously 10,11 . The experimental details of exciting, recording and referencing the 63 Cu NMR signals are identical to those in Ref.…”

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Electronic spin susceptibilities and superconductivity inHgBa2CuO4+δfrom nuclear magnetic resonance

Rybicki¹,

Kohlrautz²,

Haase³

et al. 2015

Phys. Rev. B

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Nuclear magnetic resonance (NMR) experiments on single crystals of HgBa2CuO 4+δ are presented that identify two distinct temperature-dependent spin susceptibilities: one is due to a spin component that is temperature-dependent above the critical temperature for superconductivity (Tc) and reflects pseudogap behavior; the other is Fermi-liquid-like in that it is temperature independent above Tc and vanishes rapidly below Tc. In addition, we demonstrate the existence of a third, hitherto undetected spin susceptibility: it is temperature independent at higher temperatures, vanishes at lower temperatures (below T0 ≠ Tc), and changes sign near optimal doping. This susceptibility either arises from the coupling between the two spin components, or it could be given by a distinct third spin component.

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Demonstrating the model nature of the high-temperature superconductorHgBa2CuO4+δ

Cited by 73 publications

References 43 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

Magnetic vortex lattice in HgBa2CuO4+δobserved by small-angle neutron scattering

Electronic spin susceptibilities and superconductivity inHgBa2CuO4+δfrom nuclear magnetic resonance

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