Probing the connections between superconductivity, stripe order, and structure in La1.905Ba0.095Cu1-yZnyO4

TitleProbing the connections between superconductivity, stripe order, and structure in La1.905Ba0.095Cu1-yZnyO4
Publication TypeJournal Article
Year of Publication2012
AuthorsWen JS, Xu ZJ, Xu GY, Jie Q, Hucker M, Zheludev A, Tian W, Winn BL, Zarestky JL, Singh DK, Hong T, Li Q, Gu GD, Tranquada JM
Journal TitlePhysical Review B
Date Published04
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000302696900003
Keywordsanomalous, antiferromagnetic correlations, cuprate superconductors, fluctuating stripes, high-temperature superconductor, magnetic-field, neutron-scattering, t-c superconductor, transition-temperature, transport-properties, x-dependence

The superconducting system La2-xBaxCuO4 is known to show a minimum in the transition temperature T-c at x = 1/8 where maximal stripe order is pinned by the anisotropy within the CuO2 planes that occurs in the low-temperature-tetragonal (LTT) crystal structure. For x = 0.095, where T-c reaches its maximum value of 32 K, there is a roughly coincident structural transition to a phase that is very close to LTT. Here, we present a neutron scattering study of the structural transition, and demonstrate how features of it correlate with anomalies in the magnetic susceptibility, electrical resistivity, thermal conductivity, and thermoelectric power. We also present measurements on a crystal with 1% Zn substituted for Cu, which reduces T-c to 17 K, enhances the spin stripe order, but has much less effect on the structural transition. We make the case that the structural transition correlates with a reduction of the Josephson coupling between the CuO2 layers, which interrupts the growth of the superconducting order. We also discuss evidence for two-dimensional superconducting fluctuations in the normal state, analyze the effective magnetic moment per Zn impurity, and consider the significance of the anomalous thermopower often reported in the stripe-ordered phase.

URL<Go to ISI>://WOS:000302696900003
Alternate JournalPhys. Rev. B