title: Quantum phase transitions in the cuprate superconductor Bi2Sr2-xLaxCuO6+delta.
abstract: To elucidate a quantum phase transition (QPT) in Bi(2)Sr(2-x)La(x)CuO(6+delta), we measure charge and heat transport properties at very low temperatures and examine the following characteristics for a wide range of doping: normal-state resistivity anisotropy under 58 T, temperature dependence of the in-plane thermal conductivity kappa(ab), and the magnetic-field dependence of kappa(ab). It turns out that all of them show signatures of a QPT at the 1/8 hole doping. Together with the recent normal-state Hall measurements under 58 T that signified the existence of a QPT at optimum doping, the present results indicate that there are two QPTs in the superconducting doping regime of this material.
authors.affiliation: Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan. ando@criepi.denken.or.jp
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ando
authors.forename: S
authors.initials: S
authors.lastname: Ono
authors.forename: X F
authors.initials: XF
authors.lastname: Sun
authors.forename: J
authors.initials: J
authors.lastname: Takeya
authors.forename: F F
authors.initials: FF
authors.lastname: Balakirev
authors.forename: J B
authors.initials: JB
authors.lastname: Betts
authors.forename: G S
authors.initials: GS
authors.lastname: Boebinger