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Xiao, Gang; Cieplak, Marta Z.; Xiao, John Q.; Chien, C. L.

doi:10.1103/physrevb.42.8752

Cited by 328 publications

(222 citation statements)

References 6 publications

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“…According to the Anderson's theorem, conventional isotropic s−wave superconductors are not affected by the potential (non-magnetic) scattering, but are sensitive to a spin -flip scattering on magnetic impurities [1]. In high−T c cuprates, both magnetic and non-magnetic impurities were found to cause a rapid suppression of the superconducting transition temperature, T c , strongly supporting d−wave pairing [9]. For an order parameter changing sign between the sheets of the Fermi surface (s ± symmetry), considered the most plausible pairing state in multi-band iron-based superconductors (FeSCs) [10][11][12], the response to non-magnetic scattering is expected to be significant and formally similar to the magnetic scattering in single band s−wave superconductors [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2
Cho
¹
,
Kończykowski
²
,
Murphy
³

et al. 2014
Phys. Rev. B
38
11
36
0
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Irradiation with 2.5 MeV electrons at doses up to 5.2 ×10 19 electrons/cm 2 was used to introduce point-like defects in single crystals of Ba1−xKxFe2As2 with x = 0.19 (Tc = 14 K), x = 0.26 (Tc = 32 K) and 0.34 (Tc = 39 K) to study the superconducting gap structure by probing the effect of non-magnetic scattering on electrical resistivity, ρ(T ), and London penetration depth, λ(T ). For all compositions, the irradiation suppressed the superconducting transition temperature, Tc and increased resistivity. The low -temperature behavior of λ(T ) is best described by the power -law function, ∆λ(T ) = A(T /Tc) n . While substantial suppression of Tc supports s± pairing mechanism, in samples close to the optimal doping, x = 0.26 and 0.34, the exponent n remained high (n ≥ 3) indicating robust full superconducting gaps. For the x = 0.19 composition, exhibiting coexistence of superconductivity and long -range magnetism, the suppression of Tc was much more rapid and the exponent n decreased toward dirty limit of n = 2. In this sample, the irradiation also suppressed the temperature of structural/magnetic transition, Tsm, from 103 K to 98 K consistent with the itinerant nature of the magnetic order. Our results suggest that underdoped compositions, especially in the coexisting regime are most susceptible to non-magnetic scattering and imply that in multi-band Ba1−xKxFe2As2 superconductors, the ratio of the inter-band to intra-band pairing strength, and associated gap anisotropy, increases upon the departure from the optimal doping.

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Section: Introductionmentioning

confidence: 99%

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2
Cho
¹
,
Kończykowski
²
,
Murphy
³

et al. 2014
Phys. Rev. B
38
11
36
0
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“…In these selected films superconductivity persists to y c = 0.055, while for larger resistivities T c vanishes earlier. In ceramic specimens y c = 0.03 [8].The increase in the residual resistivity, ∆ρ 0 , as a function of y is shown in the inset in Fig. 1.…”

mentioning

confidence: 99%

“…In these selected films superconductivity persists to y c = 0.055, while for larger resistivities T c vanishes earlier. In ceramic specimens y c = 0.03 [8].…”

mentioning

confidence: 99%

Metallic Nonsuperconducting Phase andD-Wave Superconductivity in Zn-SubstitutedLa1.85Sr0.15
Karpińska
¹
,
Cieplak²,
Guha³
et al. 2000
Phys. Rev. Lett.
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Measurements of the resistivity, magnetoresistance and penetration depth were made on films of La1.85Sr0.15CuO4, with up to 12 at.% of Zn substituted for the Cu. The results show that the quadratic temperature dependence of the inverse square of the penetration depth, indicative of dwave superconductivity, is not affected by doping. The suppression of superconductivity leads to a metallic nonsuperconducting phase, as expected for a pairing mechanism related to spin fluctuations. The metal-insulator transition occurs in the vicinity of kF l ≈ 1, and appears to be disorder-driven, with the carrier concentration unaffected by doping. 74.72.Dn, 74.76.Bz, 74.25.Fy, 74.20.Mn Although there is strong evidence for d-wave symmetry of the order parameter in high-T c superconductors [1], earlier experiments do not distinguish between mechanisms that lead to pure d x 2 −y 2 symmetry [2], and others that allow an admixture of s-wave pairing [3].In this letter we describe the suppression of superconductivity by disorder, with the conclusion that pure d-wave symmetry continues until the superconductivity disappears. The experiment is based on the fact that disorder strongly suppresses d-wave pairing, and may therefore lead to a transition from the superconducting state to a normal-metal state. Any s-wave pairing would be less strongly affected, so that in its presence superconductivity would be expected to persist until, with greater disorder, it is destroyed at the metal-insulator transition.Studies of the T c -suppression in electron-irradiated YBa 2 Cu 3 O 7−δ (YBCO) [3], or in Zn-doped YBCO and La 2−x Sr x CuO 4 (LSCO) [4] did not address the question of the nature of the nonsuperconducting phase. Our previous study showed the existence of a metallic nonsuperconducting phase in LSCO with variouys impurities [5], but was subject to criticism because it was done on polycrystalline, ceramic specimens.We studied a series of single-crystalline La 1.85 Sr 0.15 Cu 1−y Zn y O 4 films, with zinc content, y, from 0 to 0.12, and complete suppression of superconductivity for y > 0.055. We find that with increasing y the transition from the superconducting state is to a metallic state, with the carrier concentration unaffected by the addition of the zinc. This is in contrast with the carrier-driven transition that is observed with a change in the strontium content. We also measured the superconducting penetration depth (λ), and find that it remains proportional to T 2 when y is increased, suggesting that there is no s-wave component. As y increases to 0.12, the metal-insulator transition is approched in the vicinity of k F ℓ = 1, where k F is the Fermi wave vector and ℓ is the electronic mean free path, suggesting that the transition is disorder-driven.The c-axis oriented films, with thicknesses between 5000 and 9000Å , were grown by pulsed laser deposition on LaSrAlO 4 substrates. The films were patterned by photolithography and wires were attached with indium to evaporated silver pads. Standard six-probe geometry was used to meas...

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“…A small amount of Zn substituted for Cu is known to appreciably reduce the superconducting transition temperature. 9 Magnetic susceptibility data 9 for La 1.85 Sr 0.15 Cu 1−x Zn x O 4 and NMR data 10 for YBa 2 (Cu 1−x Zn x ) 3 O 7−δ provided evidences that Zn induces magnetic moments in the CuO 2 plane. However, not much attention has been paid to the effect of nonmagnetic impurities on optical conductivity of the cuprates.…”

Section: Introductionmentioning

confidence: 99%

Effects of nonmagnetic impurities on optical conductivity in strongly correlated systems

1999

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Effects of nonmagnetic impurities on optical conductivity in the systems of antiferromagnetically correlated electrons are examined based on the Lanczos exact diagonalization scheme. As a result of resonant scattering a lowfrequency peak in the optical conductivity is predicted to occur in the presence of the nonmagnetic impurities, which is consistent with the observed normalstate optical conductivity of YBa 2 (Cu 1−x Zn x ) 3 O 7−δ . In addition, a relatively high and broad peak is found to occur at a high frequency region as a consequence of the Heisenberg interaction between electrons, in agreement with observation in the peak position.

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Magnetic pair-breaking effects: Moment formation and critical doping level in superconductingLa1.85Sr0.15

Cited by 328 publications

References 6 publications

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2
Cho
¹
,
Kończykowski
²
,
Murphy
³

et al. 2014
Phys. Rev. B
38
11
36
0
View full text Add to dashboard Cite

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2
Cho
¹
,
Kończykowski
²
,
Murphy
³

et al. 2014
Phys. Rev. B
38
11
36
0
View full text Add to dashboard Cite

Metallic Nonsuperconducting Phase andD-Wave Superconductivity in Zn-SubstitutedLa1.85Sr0.15
Karpińska
¹
,
Cieplak²,
Guha³
et al. 2000
Phys. Rev. Lett.
Self Cite
28
3
23
0
View full text Add to dashboard Cite

Effects of nonmagnetic impurities on optical conductivity in strongly correlated systems

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Magnetic pair-breaking effects: Moment formation and critical doping level in superconductingLa1.85Sr0.15

Cited by 328 publications

References 6 publications

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2Cho1, Kończykowski2, Murphy3 et al. 2014Phys. Rev. B3811360View full textAdd to dashboardCite

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2Cho1, Kończykowski2, Murphy3 et al. 2014Phys. Rev. B3811360View full textAdd to dashboardCite

Metallic Nonsuperconducting Phase andD-Wave Superconductivity in Zn-SubstitutedLa1.85Sr0.15Karpińska1, Cieplak2, Guha3 et al. 2000Phys. Rev. Lett.Self Cite283230View full textAdd to dashboardCite

Effects of nonmagnetic impurities on optical conductivity in strongly correlated systems

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Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2
Cho
¹
,
Kończykowski
²
,
Murphy
³

et al. 2014
Phys. Rev. B
38
11
36
0
View full text Add to dashboard Cite

Effects of electron irradiation on resistivity and London penetration depth ofBa1−xKxFe2As2
Cho
¹
,
Kończykowski
²
,
Murphy
³

et al. 2014
Phys. Rev. B
38
11
36
0
View full text Add to dashboard Cite

Metallic Nonsuperconducting Phase andD-Wave Superconductivity in Zn-SubstitutedLa1.85Sr0.15
Karpińska
¹
,
Cieplak²,
Guha³
et al. 2000
Phys. Rev. Lett.
Self Cite
28
3
23
0
View full text Add to dashboard Cite