Fluctuations in the microwave conductivity of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals in zero dc magnetic field

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.2792· OSTI ID:278715

Anlage, S M; Mao, J; Booth, J C; Wu, D H; Peng, J L ^[1]

---

1. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)

We present a quantitative analysis of finite frequency fluctuation conductivity above and below {ital T}{sub {ital c}} in cuprate superconductors in zero dc magnetic field. In a YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} crystal showing a linear in temperature increase of the penetration depth at low temperatures, we find that two-dimensional (2D) finite frequency Gaussian conductivity fluctuations above {ital T}{sub {ital c}} cross over into a slower divergence of the conductivity as {ital T}{sub {ital c}} is approached from above. We find that the critical regime above {ital T}{sub {ital c}} is less than about 0.6 K wide. At and below {ital T}{sub {ital c}}, 3D fluctuations dominate the conductivity, with evidence of 3D {ital XY} critical scaling of the imaginary part of the conductivity down to 5 K below {ital T}{sub {ital c}}. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 278715
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
PENETRATION DEPTH
SCALING
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
YTTRIUM OXIDES