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Isotope effect in superconducting n-doped SrTiO3.

A Stucky1, G W Scheerer1, Z Ren1

  • 1Department of Quantum Matter Physics, Université de Genève, CH-1211 Genève 4, Switzerland.

Scientific Reports
|November 29, 2016
PubMed
Summary

Replacing oxygen-16 with oxygen-18 in doped strontium titanate significantly enhances its superconducting critical temperature (Tc) and magnetic critical field (Hc2). This unprecedented isotope effect suggests strong electron-phonon coupling, potentially linked to ferroelectric soft modes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Strontium titanate (SrTiO3) is a material exhibiting superconductivity when doped.
  • The influence of oxygen isotopes on superconducting properties is a key area of research.
  • Understanding the mechanisms behind superconductivity in SrTiO3 can provide insights into novel electronic phenomena.

Purpose of the Study:

  • To investigate the effect of oxygen isotope substitution (16O vs. 18O) on the superconducting critical temperature (Tc) in doped SrTiO3.
  • To examine the impact of this substitution on the magnetic critical field (Hc2).
  • To explore the underlying mechanisms responsible for the observed superconductivity and isotope effects.

Main Methods:

  • Synthesis of doped SrTiO3 samples with natural (16O) and enriched (18O) oxygen isotopes.
  • Measurement of superconducting critical temperature (Tc) using electrical resistivity.
  • Determination of the magnetic critical field (Hc2) through magnetic susceptibility measurements.

Main Results:

  • A significant (~50%) enhancement of the superconducting critical temperature (Tc) was observed upon substitution of 16O with 18O.
  • The magnetic critical field (Hc2) increased by approximately a factor of 2 with the heavier oxygen isotope.
  • The observed isotope effect was unusually large and opposite in sign compared to conventional superconductors.

Conclusions:

  • The substantial oxygen isotope effect strongly suggests a significant role of electron-phonon coupling in the superconductivity of doped SrTiO3.
  • The findings support recent models attributing superconductivity to strong coupling with ferroelectric soft modes in SrTiO3.
  • This research highlights the potential for isotope engineering to tune and enhance superconducting properties in oxide materials.