Ac impedance at the superconducting vortex glass transition (invited) (abstract)

Journal Article · Fri Nov 15 04:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349990· OSTI ID:5053755

Olsson, H K ^[1]; Koch, R H; Eidelloth, W; Robertazzi, R P ^[2]

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1. Physics Department, Chalmers University of Technology, S-41296 Goeteborg (Sweden)
2. IBM Research Division, Yorktown Heights, New York (USA)

We find scaling behavior of the linear ac impedance consistent with a transition into a vortex glass state in measurements on cuprate YBaCuO superconducting thin films in large magnetic fields, {ital H}{gt}{ital H}{sub cl}. The films were measured in the frequency range from 100 kHz to 500 MHz. At the vortex glass transition temperature, {ital T}{sub {ital g}}, and in the ac linear regime we find scaling behavior of the impedance amplitude, {vert bar}{ital Z}{vert bar}{proportional to}{omega}{sup 0.83}, and a frequency-independent phase, {phi}=74{degree}. The measured frequency dependence, {vert bar}{ital Z}{vert bar}{proportional to}{omega}{sup (2{minus}{ital d}+{ital z})/{ital z}}, and phase {phi}=({pi}/2)(2{minus}{ital d}+{ital z})/{ital z} is consistent within experimental error of the value of the critical exponent {ital z} obtained from dc current-voltage measurements on the same sample. At higher temperatures and still in the linear regime, we find scaling behavior of a temperature-dependent crossover frequency to the critical regime, {Omega}({ital T}{minus}{ital T}{sub {ital g}}), and at {ital T}{sub {ital g}}, scaling behavior of a current density which sets the size of the linear regime, {ital J}{sub 0}({omega}, {ital T}={ital T}{sub {ital g}}). Within experimental error, all of these results are in excellent agreement with predictions for the ac impedance of the vortex glass phase transition in large magnetic fields.

• OSTI ID: 5053755
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CURRENT DENSITY
FILMS
FREQUENCY DEPENDENCE
FREQUENCY RANGE
HIGH-TC SUPERCONDUCTORS
IMPEDANCE
KHZ RANGE
KHZ RANGE 01-100
KHZ RANGE 100-1000
MHZ RANGE
MHZ RANGE 100-1000
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VORTICES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES