Sign reversal of the oxygen isotope effect on T c in Sr 2 RuO 4

Zhiqiang Mao, Y. Maeno, Y. Mori, S. Sakita, S. Nimori, M. Udagawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We investigated the oxygen isotope effect (IE) on the transition temperature T c in the spin-triplet superconductor Sr 2 RuO 4 (with the intrinsic T c0 =1.5 K). A clear IE shift in T c was observed. Moreover, we found that the IE coefficient alpha exhibits an unusual variation with T c . For lower-T c crystals containing impurities and defects, α is positive and increases with decreasing T c ; α(T c ) is described well by the universal behavior expected theoretically. However, for crystals with T c approaching T c0 , α deviates from the universal α(T c ) and becomes negative. We discuss its possible mechanism on the basis of existing models.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number14
DOIs
StatePublished - Mar 20 2001

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Oxygen Isotopes
oxygen isotopes
Isotopes
isotope effect
Crystals
Oxygen
Superconducting materials
Impurities
Defects
Superconducting transition temperature
crystals
transition temperature
impurities
shift
defects
coefficients

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Mao, Zhiqiang ; Maeno, Y. ; Mori, Y. ; Sakita, S. ; Nimori, S. ; Udagawa, M. / Sign reversal of the oxygen isotope effect on T c in Sr 2 RuO 4 In: Physical Review B - Condensed Matter and Materials Physics. 2001 ; Vol. 63, No. 14.
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Sign reversal of the oxygen isotope effect on T c in Sr 2 RuO 4 . / Mao, Zhiqiang; Maeno, Y.; Mori, Y.; Sakita, S.; Nimori, S.; Udagawa, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 63, No. 14, 20.03.2001.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Mao, Zhiqiang

AU - Maeno, Y.

AU - Mori, Y.

AU - Sakita, S.

AU - Nimori, S.

AU - Udagawa, M.

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