Phase-sensitive evidence for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>d</mml:mi><mml:mrow><mml:msup><mml:mi>x</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>−</mml:mo><mml:msup><mml:mi>y</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:mrow></mml:msub></mml:math>-pairing symmetry in the parent-structure high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>cuprate supercond

Tomaschko, J.; Scharinger, S.; Leca, V.; Nagel, J.; Kemmler, M.; Selistrovski, T.; Koelle, D.; Kleiner, R.

doi:10.1103/physrevb.86.094509

Cited by 11 publications

(8 citation statements)

References 43 publications

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“…Because the momentum range spanned by the electron pockets is narrow, we do not observe any substantial gap anisotropy, nor can we unequivocally rule out the possibility of s-wave SC. However, a recent phase-sensitive measurement of SLCO shows a d x 2 −y 2 symmetry of the SC order parameter [30]. Our results demonstrate that cuprate high-T c SC can occur in a material with only electron-like carriers, coexistent AF, and without d-wave nodal QPs.…”

mentioning

confidence: 52%

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−x
Harter
¹
,
Maritato
²
,
Shai
³

et al. 2012
Phys. Rev. Lett.
50
3
34
0
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The asymmetry between electron and hole doping remains one of the central issues in high-temperature cuprate superconductivity, but our understanding of the electron-doped cuprates has been hampered by apparent discrepancies between the only two known families: Re(2-x)Ce(x)CuO4 and A(1-x)La(x)CuO2. Here we report in situ angle-resolved photoemission spectroscopy measurements of epitaxially stabilized Sr(1-x)La(x)CuO2 thin films synthesized by oxide molecular-beam epitaxy. Our results reveal a strong coupling between electrons and (π, π) antiferromagnetism that induces a Fermi surface reconstruction which pushes the nodal states below the Fermi level. This removes the hole pocket near (π/2, π/2), realizing nodeless superconductivity without requiring a change in the symmetry of the order parameter and providing a universal understanding of all electron-doped cuprates.

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mentioning

confidence: 52%

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−x
Harter
¹
,
Maritato
²
,
Shai
³

et al. 2012
Phys. Rev. Lett.
50
3
34
0
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“…The first results, on the half-flux quantum effect (discussed below, see also Figs. 17 and 18, with the hole doped cuprates where the technique was first employed), were performed by Tsuei and Kirtley [339] on NCCO, Tc=22-25 K, and Pr1.85Ce0.15CuO4- , Tc=22-23 K. Later work has been performed in La1.895Ce0.105CuO4, Tc=29 K (Chesca et al [340] and in the infinite layer Sr0.85La0.15CuO2, Tc=18 K (Tomaschko et al [341]). These works offer convincing proof of dx2-y2 pairing symmetry.…”

Section: Phase Sensitive Experimentsmentioning

confidence: 99%

Unconventional superconductivity

Stewart

2017

Advances in Physics

221

165

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Abstract:"Conventional" superconductivity, as used in this review, refers to electron-phonon coupled superconducting electron pairs described by BCS theory. Unconventional superconductivity refers to superconductors where the Cooper pairs are not bound together by phonon-exchange but instead by exchange of some other kind, e. g. spin fluctuations in a superconductor with magnetic order either coexistent or nearby in the phase diagram. Such unconventional superconductivity has been known experimentally since heavy fermion CeCu2Si2, with its strongly correlated 4f electrons, was discovered to superconduct below 0.6 K in 1979. Since the discovery of unconventional superconductivity in the layered cuprates in 1986, the study of these materials saw Tc jump to 164 K by 1994. Further progess in high temperature superconductivity would be aided by understanding the cause of such unconventional pairing. This review compares the fundamental properties of 9 unconventional superconducting classes of materialsfrom 4f-electron heavy fermions to organic superconductors to classes where only three known members exist to the cuprates with over 200 examples -with the hope that common features will emerge to help theory explain (and predict!) these phenomena. In addition, three new emerging classes of superconductors (topological, interfacial -e. g. FeSe on SrTiO3, and H2S under high pressure) are briefly covered, even though their "conventionality" is not yet fully determined.

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“…The order parameter in cuprate high-temperature superconductors (HTSs) is generally considered to be of pure d-wave symmetry. Pertinent evidence for this assumption for both the electron-and the hole-doped classes of HTSs stems from experiments where mainly surface phenomena are probed (e.g., angular resolved photoemission [1][2][3][4] or tricrystal experiments [5][6][7][8]). On the other hand, experimental data obtained by using techniques that probe the bulk of the material, such as nuclear magnetic resonance [9], Raman scattering [10,11], neutron crystal-field spectroscopy [12][13][14], and muon-spin rotation/relaxation (µSR) [15][16][17] provide strong evidence for the presence of a substantial s-wave component in the order parameter.…”

Section: Introductionmentioning

confidence: 99%

Suppression of the s-Wave Order Parameter Near the Surface of the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

et al. 2020

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The temperature dependencies of the in-plane (λab) and out-of-plane (λc) components of the magnetic field penetration depth were investigated near the surface and in the bulk of the electron-doped superconductor Sr0.9La0.1CuO2 by means of magnetization measurements. The measured λab(T) and λc(T) were analyzed in terms of a two-gap model with mixed s+d-wave symmetry of the order parameter. λab(T) is well described by an almost pure anisotropic d-wave symmetry component (≃96%), mainly reflecting the surface properties of the sample. In contrast, λc(T) exhibits a mixed s+d-wave order parameter with a substantial s-wave component of more than 50%. The comparison of λab−2(T) measured near the surface with that determined in the bulk by means of the muon-spin rotation/relaxation technique demonstrates that the suppression of the s-wave component of the order parameter near the surface is associated with a reduction of the superfluid density by more than a factor of two.

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Phase-sensitive evidence fordx2−y2-pairing symmetry in the parent-structure high-Tccuprate supercond

Cited by 11 publications

References 43 publications

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−x
Harter
¹
,
Maritato
²
,
Shai
³

et al. 2012
Phys. Rev. Lett.
50
3
34
0
View full text Add to dashboard Cite

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−x
Harter
¹
,
Maritato
²
,
Shai
³

et al. 2012
Phys. Rev. Lett.
50
3
34
0
View full text Add to dashboard Cite

Unconventional superconductivity

Suppression of the s-Wave Order Parameter Near the Surface of the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

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Phase-sensitive evidence fordx2−y2-pairing symmetry in the parent-structure high-Tccuprate supercond

Cited by 11 publications

References 43 publications

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−xHarter1, Maritato2, Shai3 et al. 2012Phys. Rev. Lett.503340View full textAdd to dashboardCite

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−xHarter1, Maritato2, Shai3 et al. 2012Phys. Rev. Lett.503340View full textAdd to dashboardCite

Unconventional superconductivity

Suppression of the s-Wave Order Parameter Near the Surface of the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

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Product

Resources

About

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−x
Harter
¹
,
Maritato
²
,
Shai
³

et al. 2012
Phys. Rev. Lett.
50
3
34
0
View full text Add to dashboard Cite

Nodeless Superconducting Phase Arising from a Strong (π,π) Antiferromagnetic Phase in the Infinite-Layer Electron-DopedSr1−x
Harter
¹
,
Maritato
²
,
Shai
³

et al. 2012
Phys. Rev. Lett.
50
3
34
0
View full text Add to dashboard Cite