title: Metal-to-insulator crossover in YBa2Cu3Oy probed by low-temperature quasiparticle heat transport.
authors.affiliation: Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
authors.forename: X F
authors.initials: XF
authors.lastname: Sun
authors.forename: Kouji
authors.initials: K
authors.lastname: Segawa
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ando