Observation of Josephson pair tunneling between a high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>cuprate (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml

Sun, A. G.; Gajewski, D. A.; Maple, M. B.; Dynes, R. C.

doi:10.1103/physrevlett.72.2267

Cited by 439 publications

(239 citation statements)

References 16 publications

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“…We can thus safely conclude that the order parameter along the c-axis is isotropic s-wave. This conclusion is further supported by c-axis tunneling [24], bicristal twist Josephson junctions [25], optical pulsed probe [26], and optical reflectivity (see Fig. 4 in Ref.…”

Section: Is the Maximum Value Of The Gap And (T ϕ) = 0˜ (T /T C )Gmentioning

confidence: 58%

s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8

Khasanov

Shengelaya

Karpiński

et al. 2007

J Supercond Nov Magn

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To clarify the order parameter symmetry of cuprates, the magnetic penetration depth λ was measured along the crystallographic directions a, b, and c in single crystals of YBa 2 Cu 4 O 8 via muon spin rotation. This method is direct, bulk sensitive, and unambiguous. The temperature dependences of λ −2 a and λ −2 b exhibit an inflection point at low temperatures as is typical for two-gap superconductivity (TGS) with s + d-wave character in the planes. Perpendicular to the planes a pure s-wave gap is observed thereby highlighting the important role of c-axis effects. We conclude that these are generic and universal features in the bulk of cuprates. Recently, new muon spin rotation (μSR) investigations of single crystal La 1.83 Sr 0.17 CuO 4 detected an inflection point in the temperature dependence of the inverse-squared in-plane magnetic penetration depth λ −2 ab , which is a direct consequence of two superconducting gaps with largely different zero temperature gap values [14]. Since it is unclear whether these observations are a material specific property or generic and intrinsic to HTS, the previous μSR studies were extended to single crystal YBa 2 Cu 4 O 8 and were performed by applying a magnetic field along the crystallographic directions a, b, and c. Thereby we obtain the three principle components of the second moments of the local magnetic field distribution P (B) in the mixed state, which are related to the superfluid density, and reflect directly the corresponding penetration depths λ a , λ b , and λ c . While λ −2 a and λ −2 b vary almost linearly with temperature for 20 < T < 50 K, as is expected for a d-wave order parameter, the c-axis response (λ −2 c ) saturates below 30 K, as expected for a s-wave order parameter. In addition, λ −2 a and PACS

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Section: Is the Maximum Value Of The Gap And (T ϕ) = 0˜ (T /T C )Gmentioning

confidence: 58%

s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8

Khasanov

Shengelaya

Karpiński

et al. 2007

J Supercond Nov Magn

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“…The possibility of a mixed angular-momentum-state symmetry was suggested sometime ago by Ruckenstein et al and Kotliar [14,15]. There are experimental evidences based on Josephson supercurrent for tunneling between Pb and YBa 2 Cu 3 O 7 (YBCO) [16], and on photoemission studies on Bi 2 Sr 2 CaCu 2 O 8+x [17] among others which are difficult to reconcile employing a pure s-or d-wave order parameter. These observations suggest that a mixed [s + exp(iθ)d] symmetry is applicable in these cases [18,19].…”

mentioning

confidence: 99%

Phase transition from a dx2−y2 to dx2−y2+idxy superconductor

Ghosh

Adhikari

1998

Physica C: Superconductivity

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“…Second, unless strongly underdoped, YBCO appears to be more three-dimensional than are most other cuprates, so that J ⊥ = 0 might be large enough to cause an important modification to our results. Third, it is clear from many other experiments that YBCO also has a substantial s-wave component, 13,14 which has often been ignored by many workers. 1,9 In each twin domain, a purported dominant d-wave OP would have either a d + s or a d − s OP mix, and if the twin areas were equal, then one might expect the s-wave OP component to make a negligible contribution to the measured critical currents.…”

Section: Discussionmentioning

confidence: 99%

“…Low temperature T c-axis Josephson junctions between Pb and YBCO, Bi2212, and NCCO suggested varying amounts of an s-wave OP component. 13,14,15,16,17 More recently, three Bi2212 c-axis twist Josephson junction experiments showed that the OP has at least a substantial, and possibly a dominant s-wave component for T up to the transition temperature T c . 4,18,19,20,21 Here we search for a reason for these qualitative differences.…”

Section: Introductionmentioning

confidence: 99%

Josephson (001) tilt grain boundary junctions of high-temperature superconductors

Arnold

Klemm

2006

Philosophical Magazine

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We calculate the Josephson critical current Ic across in-plane (001) tilt grain boundary junctions of high temperature superconductors. We solve for the electronic states corresponding to the electrondoped cuprates, two slightly different hole-doped cuprates, and an extremely underdoped holedoped cuprate in each half-space, and weakly connect the two half-spaces by either specular or random Josephson tunneling. We treat symmetric, straight, and fully asymmetric junctions with s-, extended-s, or d x 2 −y 2 -wave order parameters. For symmetric junctions with random grain boundary tunneling, our results are generally in agreement with the Sigrist-Rice form for ideal junctions that has been used to interpret "phase-sensitive" experiments consisting of such in-plane grain boundary junctions. For specular grain boundary tunneling across symmetric junctions, our results depend upon the Fermi surface topology, but are usually rather consistent with the random facet model of Tsuei et al. [Phys. Rev. Lett. 73, 593 (1994)]. Our results for asymmetric junctions of electrondoped cuprates are in agreement with the Sigrist-Rice form. However, our results for asymmetric junctions of hole-doped cuprates show that the details of the Fermi surface topology and of the tunneling processes are both very important, so that the "phase-sensitive" experiments based upon in-plane Josephson junctions are less definitive than has generally been thought.

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Observation of Josephson pair tunneling between a high-Tccuprate (YBa2

Cited by 439 publications

References 16 publications

s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8

s-Wave Symmetry Along the c-Axis and s+d In-plane Superconductivity in Bulk YBa2Cu4O8

Phase transition from a dx2−y2 to dx2−y2+idxy superconductor

Josephson (001) tilt grain boundary junctions of high-temperature superconductors

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