title: Canted magnetic ground state of quarter-doped manganites R0.75Ca0.25MnO3(R  =  Y, Tb, Dy, Ho, and Er).
abstract: Polycrystalline samples of the quarter-doped manganites R0.75Ca0.25MnO3(R  =  Y, Tb, Dy, Ho, and Er) were studied by x-ray diffraction and AC/DC susceptibility measurements. All five samples are orthorhombic and exhibit similar magnetic properties: enhanced ferromagnetism below T1(∼80 K) and a spin glass (SG) state below TSG(∼30 K). With increasing R3+ionic size, both T1and TSGgenerally increase. The single crystal neutron diffraction results on Tb0.75Ca0.25MnO3revealed that the SG state is mainly composed of a short-range ordered version of a novel canted (i.e. noncollinear) antiferromagnetic spin state. Furthermore, calculations based on the double exchange model for quarter-doped manganites reveal that this new magnetic phase provides a transition state between the ferromagnetic state and the theoretically predicted spin-orthogonal stripe phase.
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA.
authors.forename: R
authors.initials: R
authors.lastname: Sinclair
authors.forename: H B
authors.initials: HB
authors.lastname: Cao
authors.forename: V O
authors.initials: VO
authors.lastname: Garlea
authors.forename: M
authors.initials: M
authors.lastname: Lee
authors.forename: E S
authors.initials: ES
authors.lastname: Choi
authors.forename: Z L
authors.initials: ZL
authors.lastname: Dun
authors.forename: S
authors.initials: S
authors.lastname: Dong
authors.forename: E
authors.initials: E
authors.lastname: Dagotto
authors.forename: H D
authors.initials: HD
authors.lastname: Zhou