title: Magnetic-field induced phase transitions in a weakly coupled s=1/2 quantum spin dimer system Ba3Cr2O8.
abstract: By using bulk magnetization, electron spin resonance (ESR), heat capacity, and neutron scattering techniques, we characterize the thermodynamic and quantum phase diagrams of Ba3Cr2O8. Our ESR measurements indicate that the low field paramagnetic ground state is a mixed state of the singlet and the Sz=0 triplet for H perpendicular c. This suggests the presence of an intradimer Dzyaloshinsky-Moriya (DM) interaction with a DM vector perpendicular to the c axis.
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA.
authors.forename: M
authors.initials: M
authors.lastname: Kofu
authors.forename: H
authors.initials: H
authors.lastname: Ueda
authors.forename: H
authors.initials: H
authors.lastname: Nojiri
authors.forename: Y
authors.initials: Y
authors.lastname: Oshima
authors.forename: T
authors.initials: T
authors.lastname: Zenmoto
authors.forename: K C
authors.initials: KC
authors.lastname: Rule
authors.forename: S
authors.initials: S
authors.lastname: Gerischer
authors.forename: B
authors.initials: B
authors.lastname: Lake
authors.forename: C D
authors.initials: CD
authors.lastname: Batista
authors.forename: Y
authors.initials: Y
authors.lastname: Ueda
authors.forename: S-H
authors.initials: SH
authors.lastname: Lee