Resistance oscillations and magnetic fingerprints in superconducting Au0.7In0.3 cylinders

Yu Zadorozhny, D. R. Herman, Ying Liu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Magnetoresistance of hollow Au0.7In0.3 cylinders of submicron diameter was measured in the superconducting transition regime. Depending on the amount of disorder present in the samples, resistance oscillations were either absent or found only below a certain temperature in the transition regime. For those samples where the resistance oscillations were completely suppressed, reproducible sample-specific magnetoresistance fluctuations (magnetic fingerprints) were observed, also in the low-temperature part of the transition regime. The amplitude of the conductance fluctuation exceeded that of the universal conductance fluctuation in normal metals by several orders of magnitude. The fluctuation disappeared as superconductivity in the samples was suppressed by increasing either temperature or magnetic field. Thermal cycling to temperatures much higher than the superconducting critical temperature resulted in irreversible changes in the fingerprint pattern. In addition, a negative magnetoresistance was found just above the transition temperature in some samples. The physical origin of these observations is discussed in the context of mesoscopic effects in disordered superconductors.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number14
DOIs
StatePublished - Mar 22 2001

Fingerprint

Magnetoresistance
oscillations
Temperature
Thermal cycling
Superconductivity
Superconducting materials
Superconducting transition temperature
Temperature distribution
Metals
Magnetic fields
hollow
critical temperature
temperature distribution
superconductivity
transition temperature
disorders
cycles
magnetic fields
metals
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "Magnetoresistance of hollow Au0.7In0.3 cylinders of submicron diameter was measured in the superconducting transition regime. Depending on the amount of disorder present in the samples, resistance oscillations were either absent or found only below a certain temperature in the transition regime. For those samples where the resistance oscillations were completely suppressed, reproducible sample-specific magnetoresistance fluctuations (magnetic fingerprints) were observed, also in the low-temperature part of the transition regime. The amplitude of the conductance fluctuation exceeded that of the universal conductance fluctuation in normal metals by several orders of magnitude. The fluctuation disappeared as superconductivity in the samples was suppressed by increasing either temperature or magnetic field. Thermal cycling to temperatures much higher than the superconducting critical temperature resulted in irreversible changes in the fingerprint pattern. In addition, a negative magnetoresistance was found just above the transition temperature in some samples. The physical origin of these observations is discussed in the context of mesoscopic effects in disordered superconductors.",
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Resistance oscillations and magnetic fingerprints in superconducting Au0.7In0.3 cylinders. / Zadorozhny, Yu; Herman, D. R.; Liu, Ying.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 63, No. 14, 22.03.2001.

Research output: Contribution to journalArticle

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AU - Liu, Ying

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N2 - Magnetoresistance of hollow Au0.7In0.3 cylinders of submicron diameter was measured in the superconducting transition regime. Depending on the amount of disorder present in the samples, resistance oscillations were either absent or found only below a certain temperature in the transition regime. For those samples where the resistance oscillations were completely suppressed, reproducible sample-specific magnetoresistance fluctuations (magnetic fingerprints) were observed, also in the low-temperature part of the transition regime. The amplitude of the conductance fluctuation exceeded that of the universal conductance fluctuation in normal metals by several orders of magnitude. The fluctuation disappeared as superconductivity in the samples was suppressed by increasing either temperature or magnetic field. Thermal cycling to temperatures much higher than the superconducting critical temperature resulted in irreversible changes in the fingerprint pattern. In addition, a negative magnetoresistance was found just above the transition temperature in some samples. The physical origin of these observations is discussed in the context of mesoscopic effects in disordered superconductors.

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