title: Possible quantum critical point in La(2/3)Ca(1/3)Mn(1-x)Ga x O3.
abstract: We study the magnetic ground state in La(2/3)Ca(1/3)Mn(1-x)Ga x O3 manganites, where a quantum critical point (QCP) has been theoretically predicted. The metallic ferromagnetic ground state for low Ga doping breaks down for x > or = 0.11, an insulating state being established at low temperatures. Long-range ferromagnetism coexists with short-range magnetic correlations in the concentration range 0.11 < or = x < or = 0.145 while only the short-range correlations survive for x > or = 0.16. We discuss the implications of such a QCP to the physics of manganites and compare to other QCP systems.
authors.affiliation: Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Zaragoza, Spain. deteresa@unizar.es
authors.forename: J M
authors.initials: JM
authors.lastname: De Teresa
authors.forename: P A
authors.initials: PA
authors.lastname: Algarabel
authors.forename: C
authors.initials: C
authors.lastname: Ritter
authors.forename: J
authors.initials: J
authors.lastname: Blasco
authors.forename: M R
authors.initials: MR
authors.lastname: Ibarra
authors.forename: L
authors.initials: L
authors.lastname: Morellon
authors.forename: J I
authors.initials: JI
authors.lastname: Espeso
authors.forename: J C
authors.initials: JC
authors.lastname: Gómez-Sal