Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>1.895</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>0.105</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Superconductor

Chang, J.; Schnyder, Andreas P.; Gilardi, R.; Rønnow, Henrik M.; Pailhés, S.; Christensen, Niels Bech; Niedermayer, Ch.; McMorrow, D. F.; Hiess, A.; Stunault, A.; Enderle, M.; Lake, B.; Sobolev, Oleg; Momono, N.; Oda, Masahiro; Ido, M.; Mudry, Christopher; Mesot, J.

doi:10.1103/physrevlett.98.077004

Cited by 36 publications

(30 citation statements)

References 33 publications

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“…Indeed, such speculation is also consistent with the data in LSCO, where one finds a clean spin gap and incommensurate "resonance" -or more precisely, susceptibility gain below T c -near optimal Sr-doping in the metallic phase 12,13,38 but fails to detect any signature of a clean spin gap or resonance in underdoped materials in the insulating-like phase 17,18,39 .…”

Section: Discussionsupporting

confidence: 82%

Quantum spin excitations through the metal-to-insulator crossover inYBa2Cu3O6+y

Yamani

Kang

et al. 2008

Phys. Rev. B

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We use inelastic neutron scattering to study the temperature dependence of the spin excitations of a detwinned superconducting YBa2Cu3O6.45 (Tc = 48 K). In contrast to earlier work on YBa2Cu3O6.5 (Tc = 58 K), where the prominent features in the magnetic spectra consist of a sharp collective magnetic excitation termed "resonance" and a large (hω ≈ 15 meV) superconducting spin gap, we find that the spin excitations in YBa2Cu3O6.45 are gapless and have a much broader resonance. Our detailed mapping of magnetic scattering along the a * /b * -axis directions at different energies reveals that spin excitations are unisotropic and consistent with the "hourglass"-like dispersion along the a * -axis direction near the resonance, but they are isotropic at lower energies. Since a fundamental change in the low-temperature normal state of YBa2Cu3O6+y when superconductivity is suppressed takes place at y ∼ 0.5 with a metal-to-insulator crossover (MIC), where the ground state transforms from a metallic to an insulating-like phase, our results suggest a clear connection between the large change in spin excitations and the MIC. The resonance therefore is a fundamental feature of metallic ground state superconductors and a consequence of high-Tc superconductivity.

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Section: Discussionsupporting

confidence: 82%

Quantum spin excitations through the metal-to-insulator crossover inYBa2Cu3O6+y

Yamani

Kang

et al. 2008

Phys. Rev. B

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“…Such a central peak has just been reported by J. Tranquada at this conference [11], as "gapless magnetic excitations." It appears [11] that such a peak has been noticed in earlier work, where it was interpreted as a gap with unexpected behavior, becoming smaller with underdoping [12]. We note that Fig.…”

Section: The Central Peaksupporting

confidence: 75%

Multiband Responses in High-T c Cuprate Superconductors

Nikšić

Kupčić

Barišić

et al. 2013

J Supercond Nov Magn

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We report on the interplay of localized and extended degrees of freedom in the metallic state of high-temperature superconductors in a multiband setting. Various ways in which the bare magnetic response may become incommensurate are measured against both phenomenological and theoretical requirements. In particular, the pseudogap temperature is typically much higher than the incommensurability temperature. When microscopic strong-coupling effects with real-time dynamics between copper and oxygen sites are included, they tend to restore commensurability. Quantum transport equations for low-dimensional multiband electronic systems are used to explain the linear doping dependence of the dc conductivity and the doping and temperature dependence of the Hall number in the underdoped LSCO compounds. Coulomb effects of dopands are inferred from the doping evolution of the Hartree-Fock model parameters.

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“…2(b) and 3 is a common feature observed throughout the doping range in LSCO. 23,26,35 We observe a peak in S(Q IC ,ω,T ) at temperatures close to T c . The peak shifts towards higher temperatures as the energy transfer,hω, increases.…”

Section: A Freezing and Glassinessmentioning

confidence: 76%

“…Conversely, when the magnetic ordering/freezing tendencies are weakened by moving to away from x max , the low-energy dynamics can be expected to become dominated by the physics of the superconductor with its superconducting spin gap opening at T c , rather than that of the insulator with its anisotropy gaps. This physical picture goes a long way towards reconciling the disagreements of interpretations between J. Chang et al 23 and M. Kofu et al 21 …”

Section: B Anisotropy Gapmentioning

confidence: 82%

“…These data were interpreted in terms of two components: a spin-gapped response similar to what is observed at optimal doping, 22 i.e., a gap caused by superconductivity, and a second component related to spin stripe-ordered or stripe-frozen domains. In contrast to this view, J. Chang et al 23 proposed that for x = 0.105 < x max magnetic order renormalizes the value of the superconductivity-related spin gap. The two-component view is also in contrast to what is observed at x = 0.145 > x max where the spin gap is found to close at the quantum critical point for the incommensurate spin order.…”

Section: Introductionmentioning

confidence: 94%

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Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4<

et al. 2013

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We present high-resolution triple-axis neutron scattering studies of the high-temperature superconductor La 1.88 Sr 0.12 CuO 4 (T c = 27 K). The temperature dependence of the low-energy incommensurate magnetic fluctuations reveals distinctly glassy features. The glassiness is confirmed by the difference between the ordering temperature T N T c inferred from elastic neutron scattering and the freezing temperature T f 11 K obtained from muon spin rotation studies. The magnetic field independence of the observed excitation spectrum as well as the observation of a partial suppression of magnetic spectral weight below 0.75 meV for temperatures smaller than T f , indicate that the stripe frozen state is capable of supporting a spin anisotropy gap, of a magnitude similar to that observed in the spin and charge stripe-ordered ground state of La 1.875 Ba 0.125 CuO 4 . The difference between T N and T f implies that the significant enhancement in a magnetic field of nominally elastic incommensurate scattering is caused by strictly inelastic scattering-at least in the temperature range between T f and T c -which is not resolved in the present experiment. Combining the results obtained from our study of La 1.88 Sr 0.12 CuO 4 with a critical reappraisal of published neutron scattering work on samples with chemical composition close to p = 0.12, where local probes indicate a sharp maximum in T f (p), we arrive at the view that the low-energy fluctuations are strongly dependent on composition in this regime, with anisotropy gaps dominating only sufficiently close to p = 0.12 and superconducting spin gaps dominating elsewhere.

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Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the UnderdopedLa1.895Sr0.105CuO4Superconductor

Cited by 36 publications

References 33 publications

Quantum spin excitations through the metal-to-insulator crossover inYBa2Cu3O6+y

Quantum spin excitations through the metal-to-insulator crossover inYBa2Cu3O6+y

Multiband Responses in High-T c Cuprate Superconductors

Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4<

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