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Maeda, Akiko; Iino, Yoichi; Hanaguri, T.; Motohira, N.; Kishio, K.; Fukase, Tetsuo

doi:10.1103/physrevlett.74.1202

Cited by 63 publications

(35 citation statements)

References 19 publications

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“…1 , 2 , 3 Many experiments have been conducted to observe this effect in high-T c superconductors (HTSC). 4,5,6,7,8 Some of this work observed a linear-magnetic-fielddependent penetration depth at low temperature, in agreement with theory. 1,2 However, the quantitative, and some qualitative, details of the NLME signals in these experiments did not agree with the theory.…”

supporting

confidence: 86%

Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tcsuperconductors

et al. 2005

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We measure the local harmonic generation from superconducting thin films at microwave frequencies to investigate the intrinsic nonlinear Meissner effect near T c in zero magnetic field. Both second and third harmonic generation are measured to identify time-reversal symmetry breaking (TRSB) and time-reversal symmetric (TRS) nonlinearities. We perform a systematic doping-dependent study of the nonlinear response and find that the TRS characteristic nonlinearity current density scale follows the doping dependence of the de-pairing critical current density. We also extract a spontaneous TRSB characteristic current density scale that onsets at T c , grows with decreasing temperature, and systematically decreases in magnitude (at fixed T/T c ) with under-doping. The origin of this current scale could be Josephson circulating currents or the spontaneous magnetization associated with a TRSB order parameter.

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supporting

confidence: 86%

Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tcsuperconductors

et al. 2005

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“…Support for the d-wave symmetry also arises from specific heat measurements 3 and the recent observation of a nonlinear Meisner effect. 4 Photoemission studies,…”

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confidence: 99%

“…We discuss some of the general properties of this free energy and derive the corresponding GL differential equations as well as an expression for the supercurrent. In doing this, and throughout the entire paper, we restrict ourselves to the simple case of tetragonal symmetry, described by the point group D 4 .…”

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confidence: 99%

Vortex state in ad-wave superconductor

et al. 1996

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We discuss the physics of the vortex state in a d-wave superconductor, using the phenomenological Ginzburg-Landau theory, where many novel phenomena arise from the small admixture of the s-wave component induced by spatial variations in the dominant d-wave. Properties of an isolated vortex and of the Abrikosov vortex lattice are studied by means of analytic and numerical methods. An isolated vortex has a considerable structure, with four "extra" nodes in the s-wave order parameter symmerically placed around the core and an amplitude forming a four-lobe profile decaying as 1/r 2 at large distances. The supercurrent and magnetic field distributions are also calculated. The Abrikosov lattice is in general oblique with the precise shape determined by the magnetic field and sd mixing parameter ǫv. The magnetic field distribution in the Abrikosov state has two nonequivalent saddle points resulting in the prediction of a double peak line shape in µSR and NMR experiments as a test of a d-wave symmetry. Detailed comparison is made with existing experimental data and new experiments are proposed to test for the predicted effects.

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“…Early experiments to detect the aNLME of cuprates through transverse magnetization [8,9], magnetic penetration depth [10][11][12], and surface impedance [13] measurements did not establish conclusive evidence of the effect [7]. Later, sensitive nonlinear microwave measurement techniques established the existence of the NLME in cuprates from the temperature dependence of the intermodulation power at low temperatures [14][15][16], although the anisotropy of the effect was not measured.…”

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confidence: 99%

Imaging the Anisotropic Nonlinear Meissner Effect in NodalYBa2Cu3O7−δThin-Film Superconductors

et al. 2013

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We have directly imaged the anisotropic nonlinear Meissner effect in an unconventional superconductor through the nonlinear electrodynamic response of both (bulk) gap nodes and (surface) Andreev bound states. A superconducting thin film is patterned into a compact self-resonant spiral structure, excited near resonance in the radio-frequency range, and scanned with a focused laser beam perturbation. At low temperatures, direction-dependent nonlinearities in the reactive and resistive properties of the resonator create photoresponse that maps out the directions of nodes, or of bound states associated with these nodes, on the Fermi surface of the superconductor. The method is demonstrated on the nodal superconductor YBa2Cu3O 7−δ and the results are consistent with theoretical predictions for the bulk and surface contributions.Introduction -The Meissner effect is the spontaneous exclusion of magnetic flux from the bulk of a superconductor and is one of the hallmarks of superconductivity. In the presence of a magnetic field, a superconductor must invest kinetic energy in a supercurrent flow to screen out the applied field. This reduces the free energy difference between the superconducting and normal states, resulting in a reduction in magnitude of the superconducting order parameter. This in turn leads to a field-and current-dependent magnetic penetration depth, diamagnetic moment, etc. and is referred to as the nonlinear Meissner effect (NLME). Microscopically the NLME arises when Cooper pairs at the leading edge of the current-carrying Fermi surface can de-pair into available quasi-particle states at the back-end and create a quasi-particle backflow current [1]. Conventional (fully gapped) superconductors show the strongest nonlinearities near T c , and have exponentially suppressed nonlinear response at low temperatures, T ≪ T c . Unconventional superconductors with nodes in the superconducting energy gap are expected to have a strong nonlinear Meissner effect at low temperatures, due to the nodal excitations out of the superconducting ground state [2]. In addition this nonlinear response should be anisotropic, reflecting the locations of nodes of the gap on the Fermi surface.

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Magnetic Field Dependence of the London Penetration Depth ofBi2Sr2Ca
Akiko Maeda
¹
,
Yoichi Iino
²
,
T. Hanaguri
³

et al.

Cited by 63 publications

References 19 publications

Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tcsuperconductors

Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tcsuperconductors

Vortex state in ad-wave superconductor

Imaging the Anisotropic Nonlinear Meissner Effect in NodalYBa2Cu3O7−δThin-Film Superconductors

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Magnetic Field Dependence of the London Penetration Depth ofBi2Sr2CaAkiko Maeda1, Yoichi Iino2, T. Hanaguri3 et al.

Cited by 63 publications

References 19 publications

Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tcsuperconductors

Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tcsuperconductors

Vortex state in ad-wave superconductor

Imaging the Anisotropic Nonlinear Meissner Effect in NodalYBa2Cu3O7−δThin-Film Superconductors

Contact Info

Product

Resources

About

Magnetic Field Dependence of the London Penetration Depth ofBi2Sr2Ca
Akiko Maeda
¹
,
Yoichi Iino
²
,
T. Hanaguri
³

et al.