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Lee, Shih-Fu; Morgan, D. C.; Ormeno, R. J.; Broun, D. M.; Doyle, R. A.; Waldram, J.R.; Kadowaki, Kazunori

doi:10.1103/physrevlett.77.735

Cited by 190 publications

(147 citation statements)

References 28 publications

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“…Some high-T c superconductors, such as Bi 2 Sr 2 Ca 2 Cu 2 O 8+δ , absorb very strongly in the microwave regime even at temperatures T far below T c [1,2]. At a fixed frequency as a function of T , the real conductivity typically has two features: a sharp peak near T c , and a broad, frequency-dependent background extending to quite low T .…”

Section: Introductionmentioning

confidence: 99%

Models for enhanced absorption in inhomogeneous superconductors

Barabash

Stroud

2003

Phys. Rev. B

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We discuss the low-frequency absorption arising from quenched inhomogeneity in the superfluid density ρ s of a model superconductor. Such inhomogeneities may arise in a high-T c superconductor from a wide variety of sources, including quenched random disorder and static charge density waves such as stripes. Using standard classical methods for treating randomly inhomogeneous media, we show that both mechanisms produce additional absorption at finite frequencies. For a two-fluid model with weak mean-square fluctuations (δρ s ) 2 in ρ s and a frequency-independent quasiparticle conductivity, the extra absorption has oscillator strength proportional to the quantity (δρ s ) 2 /ρ s , as observed in some experiments. Similar behavior is found in a two-fluid model with anticorrelated fluctuations in the superfluid and normal fluid densities. The extra absorption typically occurs as a Lorentzian centered at zero frequency. We present simple model calculations for this extra absorption under conditions of both weak and strong fluctuations. The relation between our results and other model calculations is briefly discussed.

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Section: Introductionmentioning

confidence: 99%

Models for enhanced absorption in inhomogeneous superconductors

Barabash

Stroud

2003

Phys. Rev. B

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“…In recent years, many experiments have been designed to test the order parameter (OP) symmetry in the cuprate superconductors. However, contradictory conclusions have been drawn from different experimental techniques [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], which can be classified into being bulk-sensitive and surface-sensitive. For example, the magnetic penetration depth measurements and polarized Raman scattering experiments are bulk-sensitive.…”

Section: Introductionmentioning

confidence: 99%

Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extendedswave with eight line nodes

Zhao

2001

Phys. Rev. B

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we identify the intrinsic bulk pairing symmetry for both electron and hole-doped cuprates from the existing bulk-and nearly bulk-sensitive experimental results such as magnetic penetration depth, Raman scattering, single-particle tunneling, Andreev reflection, nonlinear Meissner effect, neutron scattering, thermal conductivity, specific heat, and angle-resolved photoemission spectroscopy. These experiments consistently show that the dominant bulk pairing symmetry in hole-doped cuprates is of extended s-wave with eight line nodes, and of anisotropic s-wave in electron-doped cuprates. The proposed pairing symmetries do not contradict some surface-and phase-sensitive experiments which show a predominant d-wave pairing symmetry at the degraded surfaces. We also quantitatively explain the phase-sensitive experiments along the c-axis for both Bi2Sr2CaCu2O8+y and YBa2Cu3O7−y.

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“…Here we call attention to the fact that similar maxima were observed by many authors in the microwave frequency range for different high-T c cuprate superconductors: YBCO [16][17][18], Bi 2 Sr 2 CaCu 2 O 8+ [19], and Tl 2 Ba 2 CuO 6+ [20]. Mainly, these maxima are interpreted as a result of the increase in the conductivity due to the fluctuations.…”

Section: Discussionmentioning

confidence: 88%

“…Namely, we used 0 = 40 c T The similar maxima in the ac absorption were observed in many microwave experiments (see, e.g., Refs. 8, [16][17][18][19][20][21]. The authors of the majority of these experiments discuss the results of the surface impedance measurements in terms of the complex highfrequency conductivity 12 .…”

Section: Vortex State Nonlocal Effectsmentioning

confidence: 99%

Response of HTS tapes to a parallel ac magnetic field in the vicinity of the superconducting transition

Fisher

Voloshin

Yampol’skiı̆

2013

Low Temperature Physics

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We have studied the temperature dependence of the ac magnetic susceptibility (T) = (T) + i (T) of YBCO tapes in a parallel magnetic field in both the Meissner and vortex states. For the vortex state, we have observed two maxima in the (T) dependence. The position and the magnitude of one of these maxima are described well by the nonlocal critical state model. The second maximum and corresponding kink in the function (T) observed close to the temperature T c of the superconducting transition are unexpected. The origin of this maximum cannot be explained within the usual notions of the high-temperature superconductivity. We suppose that it is related to some magnetic restructuring in the superconducting layer just above T c . Our results put a question on the correctness of the interpretation of some previous microwave experiments. PACS: 74.25

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a−bPlane Microwave Surface Impedance of a High-Quality Bi2S
Shih-Fu Lee
¹
,
D. C. Morgan
²
,
R. J. Ormeno
³

et al.

Cited by 190 publications

References 28 publications

Models for enhanced absorption in inhomogeneous superconductors

Models for enhanced absorption in inhomogeneous superconductors

Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extendedswave with eight line nodes

Response of HTS tapes to a parallel ac magnetic field in the vicinity of the superconducting transition

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a−bPlane Microwave Surface Impedance of a High-Quality Bi2SShih-Fu Lee1, D. C. Morgan2, R. J. Ormeno3 et al.

Cited by 190 publications

References 28 publications

Models for enhanced absorption in inhomogeneous superconductors

Models for enhanced absorption in inhomogeneous superconductors

Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extendedswave with eight line nodes

Response of HTS tapes to a parallel ac magnetic field in the vicinity of the superconducting transition

Contact Info

Product

Resources

About

a−bPlane Microwave Surface Impedance of a High-Quality Bi2S
Shih-Fu Lee
¹
,
D. C. Morgan
²
,
R. J. Ormeno
³

et al.