Negative Oxygen Isotope Effect on the Static Spin Stripe Order in La(2-x)BaₓCuO₄ (x = 1/8)

الأصل · EN

Large negative oxygen-isotope (16O/18O) effects (OIE's) on the static spin-stripe ordering temperature Tₛo and the magnetic volume fraction Vₘ were observed in La(2-x)BaₓCuO₄ (x = 1/8) by means of muon spin rotation experiments. The corresponding OIE exponents were found to be alpha(Tₛo) = -0.57(6) and alpha(Vₘ) = -0.71(9), which are sign reversed to alpha(Tc) = 0.46(6) measured for the superconducting transition temperature Tc. This indicates that the electron-lattice interaction is involved in the stripe formation and plays an important role in the competition between bulk superconductivity and static stripe order in the cuprates.