title: Novel quantum criticality in CeRu2Si2 near absolute zero observed by thermal expansion and magnetostriction.
abstract: We report linear thermal expansion and magnetostriction measurements for CeRu2Si2 in magnetic fields up to 52.6 mT and at temperatures down to 1 mK. At high temperatures, this compound showed Landau-Fermi-liquid behavior: The linear thermal expansion coefficient and the magnetostriction coefficient were proportional to the temperature and magnetic field, respectively. In contrast, a pronounced non-Fermi-liquid effect was found below 50 mK. The negative contribution of thermal expansion and magnetostriction suggests the existence of an additional quantum critical point.
authors.affiliation: Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Yoshida
authors.forename: S
authors.initials: S
authors.lastname: Abe
authors.forename: D
authors.initials: D
authors.lastname: Takahashi
authors.forename: Y
authors.initials: Y
authors.lastname: Segawa
authors.forename: Y
authors.initials: Y
authors.lastname: Komai
authors.forename: H
authors.initials: H
authors.lastname: Tsujii
authors.forename: K
authors.initials: K
authors.lastname: Matsumoto
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Onuki