title: Negative oxygen isotope effect on the static spin stripe order in superconducting La(2-x)Ba(x)CuO(4) (x=1/8) observed by muon-spin rotation.
abstract: Large negative oxygen-isotope (^{16}O and ^{18}O) effects (OIEs) on the static spin-stripe-ordering temperature T_{so} and the magnetic volume fraction V_{m} were observed in La_{2-x}Ba_{x}CuO_{4}(x=1/8) by means of muon-spin-rotation experiments. The corresponding OIE exponents were found to be α_{T_{so}}=-0.57(6) and α_{V_{m}}=-0.71(9), which are sign reversed to α_{T_{c}}=0.46(6) measured for the superconducting transition temperature T_{c}. 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.
authors.affiliation: Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: Z
authors.initials: Z
authors.lastname: Guguchia
authors.affiliation: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Khasanov
authors.affiliation: Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Bendele
authors.affiliation: Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Pomjakushina
authors.affiliation: Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
authors.forename: K
authors.initials: K
authors.lastname: Conder
authors.affiliation: Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia.
authors.forename: A
authors.initials: A
authors.lastname: Shengelaya
authors.affiliation: Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: H
authors.initials: H
authors.lastname: Keller