Sign reversal of the oxygen isotope effect on Tc in Sr2RuO4

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

Sign reversal of the oxygen isotope effect on T_c in Sr₂RuO₄

Y. Mori, Z. Q. Mao, Y. Maeno, 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)
Article number	144514
Pages (from-to)	1445141-1445145
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	14
State	Published - 2001

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Sign reversal of the oxygen isotope effect on Tc in Sr2RuO4",

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 - Mori, Y.

AU - Mao, Z. Q.

AU - Maeno, Y.

AU - Sakita, S.

AU - Nimori, S.

AU - Udagawa, M.

PY - 2001

Y1 - 2001

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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M3 - Article

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SN - 0163-1829

VL - 63

SP - 1445141

EP - 1445145

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 14

M1 - 144514

ER -

Sign reversal of the oxygen isotope effect on T_c in Sr₂RuO₄

Abstract

All Science Journal Classification (ASJC) codes

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