G. W. Crabtree

Argonne National Laboratory

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W. K. Kwok

Argonne National Laboratory

U. Welp

Argonne National Laboratory

V. M. Vinokur

Terra Quantum (Switzerland)

L. M. Paulius

Western Michigan University

K. G. Vandervoort

California State Polytechnic University

Zhili Xiao

Argonne National Laboratory

J. A. Fendrich

University of Illinois Urbana-Champaign

A. Umezawa

University of Wisconsin–Madison

J.W. Downey

Enterprise Ireland

V. Tobos

Lawrence Technological University

Cooperative Institutions

Argonne National Laboratory

121

Northwestern University

Los Alamos National Laboratory

University of Illinois Urbana-Champaign

University of Illinois Chicago

Northern Illinois University

University of Chicago

University of California, San Diego

United States Department of Energy

Centre National de la Recherche Scientifique

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Superconducting energy gap and normal-state conductivity of a single-domainYBa2Cu3

Physical Review Letters (1990)

Z. Schlesinger R. T. Collins F. Holtzberg C. Feild S. H. Blanton

Using polarized reflectivity measurements of single-domain crystals, we are able to distinguish chain and plane contributions to the infrared conductivity of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$. A substantial chain contribution to \ensuremath{\sigma}(\ensuremath{\omega}) persisting to low frequency and temperature is observed. For the intrinsic conductivity of the ${\mathrm{CuO}}_{2}$ planes a superconducting energy gap of 500 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ (2\ensuremath{\Delta}/${\mathit{kT}}_{\mathit{c}}$\ensuremath{\simeq}8) is evident in the infrared data, while the normal-state conductivity drops much more slowly with \ensuremath{\omega} than the ordinary Drude form, and can be described in terms of a scattering rate \ensuremath{\Elzxh}/${\mathrm{\ensuremath{\tau}}}^{\mathrm{*}}$\ensuremath{\sim}kT+\ensuremath{\Elzxh}\ensuremath{\omega} at low frequency. The former result (2\ensuremath{\Delta}/${\mathit{kT}}_{\mathit{c}}$\ensuremath{\simeq}8) suggests suppression of ${\mathit{T}}_{\mathit{c}}$; the latter, that ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ is not an ordinary Fermi liquid.

Optical conductivity

10.1103/physrevlett.65.801

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Citations (440)

Angular Dependence of the Lower Critical Point of the First Order Vortex Melting Line in YBCO Single Crystals

APS March Meeting Abstracts (2000)

L. M. Paulius V. Tobos A. M. Petrean W. K. Kwok G. W. Crabtree

Line (geometry)

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Direct observation of dissipative flux motion and pinning by twin boundaries in YBa_{2}Cu_{3}O_{7-δ} single crystals

Physical Review Letters (1990)

W. K. Kwok U. Welp G. W. Crabtree K. G. Vandervoort R. Hulscher

We present the first direct observation of Lorentz-force-induced dissipative flux motion and the effect of twin boundaries as pinning centers in a single crystal of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ with twin planes oriented in a single direction.

10.1103/physrevlett.64.966

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Citations (357)

Initial magnetization and magnetic relaxation in a single crystal of Bi sub 2 Sr sub 2 CaCu sub 2 O sub x

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (1991)

Ming Xu A. Umezawa G. W. Crabtree

The initial magnetization and the magnetic relaxation in a single crystal of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} over a wide range of temperatures and fields have been measured. The results show that the initial magnetization varies with the measuring time at a given temperature and the relaxation is logarithmic in our measuring windows. 3 refs., 3 figs.

Magnetic Relaxation

Crystal (programming language)

Atmospheric temperature range

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Vortex Melting and the Liquid State in Yba2Cu3Ox

Springer eBooks (1999)

G. W. Crabtree W. K. Kwok U. Welp Daniel López J. A. Fendrich

Liquid state

10.1007/978-94-011-4558-9_17

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Vortex melting and the liquid state in YBa{sub 2}Cu{sub 3}O{sub x}.

G. W. Crabtree

The experimental vortex phase diagram of YBa{sub 2}Cu{sub 3}O{sub x} is reviewed, with emphasis on first order vortex melting, the upper and lower critical points on the melting line, and the effect of disorder arising from twin boundary and point defect pinning.

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First Order Vortex Melting in Twinned YBCO Single Crystals

APS March Meeting Abstracts (2001)

L. M. Paulius V. Tobos A. M. Petrean W. K. Kwok G. W. Crabtree

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A generalized ray expansion method for analyzing the EM scattering by open-ended waveguide cavities

Prabhakar H. Pathak Robert J. Burkholder R. Chou G. W. Crabtree

The high-frequency scattering from the interior of a relatively arbitrarily shaped open-ended waveguide cavity in free space is analyzed by a generalized ray expansion (GRE) method, when the cavity is terminated within by a planar boundary and illuminated by an external EM plane wave. In the GRE method, the aperture at the open end of the cavity is first divided into subapertures, and a cone of rays (or a fan of rays in the 2-D case) is shot within the cavity from each subaperture. The initial amplitudes of these rays can be found from the radiated far-field patterns of each of the subapertures in the absence of the slowly varying cavity walls. These rays, based on the GRE, implicitly contain the effects of the waves diffracted into the cavity via the edges at the open end without having to explicitly track the more cumbersome edge diffracted rays into the interior cavity region. The difference between the manner in which the GRE and the conventional geometrical optics methods launch rays within the cavity is illustrated.< >

Waveguide

Aperture (computer memory)

10.1109/aps.1989.134823

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Citations (5)

Flux jumps in Y-123 and La-214

Physica C Superconductivity (1997)

Ming Xu K. Zhang Heinrich M. Jaeger D. G. Hinks G. W. Crabtree

Crystal (programming language)

10.1016/s0921-4534(97)01311-7

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Citations (2)

Oxygen vacancy ordering and superconductivity in YBa/sub 2/Cu/sub 3/O/sub 7-x/

J. D. Jorgensen H. Shaked D. G. Hinks B. Da̧browski B. W. Veal

The superconducting properties of YBa/sub 2/Cu/sub 3/O/sub 7-x/ have been shown to depend markedly on the overall oxygen stoichiometry and on the ordering of oxygen vacancies on the available sites. YBa/sub 2/Cu/sub 3/O/sub 7-x/ has been studied in situ by high-temperature neutron powder diffraction in controlled oxygen atmospheres in order to learn the structural properties of the system in thermodynamic equilibrium. Additionally, metastable, oxygen-deficient samples produced by quenching into liquid nitrogen from high temperature and various oxygen partial pressures have been studied at room temperature or low temperature in order to correlate the structural and superconducting properties. Such experiments have shown that a systematic relationship exists between the superconducting transition temperature, T/sub c/, the number of oxygen vacancies, and the degree of oxygen vacancy ordering. This brief paper reviews our work in these areas. 3 figs., 10 refs.

Stoichiometry

Transition temperature

Metastability

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