Maqola

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">a</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="italic">b</mml:mi></mml:math>Plane Microwave Surface Impedance of a High-Quality B<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">i</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>S<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">r</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>CaC<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">u</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Single Crystal

Shih-Fu LeeInterdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United KingdomD. C. MorganInterdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United KingdomR. J. OrmenoInterdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United KingdomD. M. BrounInterdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United KingdomR. A. DoyleInterdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United KingdomJ.R. WaldramInterdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United KingdomKazunori KadowakiInterdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom

1996lv

ABI

Annotatsiya

The $a\ensuremath{-}b$ plane microwave surface impedance of a high-quality B${\mathrm{i}}_{2}$S${\mathrm{r}}_{2}$CaC${\mathrm{u}}_{2}$${\mathrm{O}}_{8}$ single crystal $({T}_{c}\ensuremath{\approx}93\mathrm{K})$ has been measured at 14.4, 24.6, and 34.7 GHz. The surface resistance at low temperature is the lowest yet reported, is comparable with the best ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ data, and has a characteristic ${\ensuremath{\omega}}^{2}$ frequency dependence. The change in penetration depth, $\ensuremath{\Delta}{\ensuremath{\lambda}}_{\mathrm{ab}}(T)$, has a strong linear term at low temperature which is consistent with a gap with line nodes on the Fermi surface. The real part of the microwave conductivity displays a broad peak at low temperature, similar to that observed in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$.

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Identifikatorlar

DOI: 10.1103/physrevlett.77.735

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