Sign reversal of the oxygen isotope effect on Tc in Sr2RuO4

Z. Q. Mao; Y. Maeno; Y. Mori; S. Sakita; S. Nimori; M. Udagawa

doi:10.1103/PhysRevB.63.144514

Sign reversal of the oxygen isotope effect on T_c in Sr₂RuO₄

Z. Q. Mao, Y. Maeno, Y. Mori, S. Sakita, S. Nimori, M. Udagawa

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Abstract

We investigated the oxygen isotope effect (IE) on the transition temperature T_c in the spin-triplet superconductor Sr₂RuO₄ (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 language	English (US)
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.63.144514
State	Published - Mar 20 2001

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We investigated the oxygen isotope effect (IE) on the transition temperature Tc in the spin-triplet superconductor Sr2RuO4 (with the intrinsic Tc0=1.5 K). A clear IE shift in Tc was observed. Moreover, we found that the IE coefficient alpha exhibits an unusual variation with Tc. For lower-Tc crystals containing impurities and defects, α is positive and increases with decreasing Tc; α(Tc) is described well by the universal behavior expected theoretically. However, for crystals with Tc approaching Tc0, α deviates from the universal α(Tc) and becomes negative. We discuss its possible mechanism on the basis of existing models.",

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T1 - Sign reversal of the oxygen isotope effect on Tc in Sr2RuO4

AU - Mao, Z. Q.

AU - Maeno, Y.

AU - Mori, Y.

AU - Sakita, S.

AU - Nimori, S.

AU - Udagawa, M.

PY - 2001/3/20

Y1 - 2001/3/20

N2 - We investigated the oxygen isotope effect (IE) on the transition temperature Tc in the spin-triplet superconductor Sr2RuO4 (with the intrinsic Tc0=1.5 K). A clear IE shift in Tc was observed. Moreover, we found that the IE coefficient alpha exhibits an unusual variation with Tc. For lower-Tc crystals containing impurities and defects, α is positive and increases with decreasing Tc; α(Tc) is described well by the universal behavior expected theoretically. However, for crystals with Tc approaching Tc0, α deviates from the universal α(Tc) and becomes negative. We discuss its possible mechanism on the basis of existing models.

AB - We investigated the oxygen isotope effect (IE) on the transition temperature Tc in the spin-triplet superconductor Sr2RuO4 (with the intrinsic Tc0=1.5 K). A clear IE shift in Tc was observed. Moreover, we found that the IE coefficient alpha exhibits an unusual variation with Tc. For lower-Tc crystals containing impurities and defects, α is positive and increases with decreasing Tc; α(Tc) is described well by the universal behavior expected theoretically. However, for crystals with Tc approaching Tc0, α deviates from the universal α(Tc) and becomes negative. We discuss its possible mechanism on the basis of existing models.

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Sign reversal of the oxygen isotope effect on T_c in Sr₂RuO₄

Abstract

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