title: Quantum critical transition amplifies magnetoelastic coupling in Mn[N(CN)2]2.
abstract: We report the discovery of a magnetic quantum critical transition in Mn[N(CN)(2)](2) that drives the system from a canted antiferromagnetic state to the fully polarized state with amplified magnetoelastic coupling as an intrinsic part of the process. The local lattice distortions, revealed through systematic phonon frequency shifts, suggest a combined MnN(6) octahedra distortion+counterrotation mechanism that reduces antiferromagnetic interactions and acts to accommodate the field-induced state. These findings deepen our understanding of magnetoelastic coupling near a magnetic quantum critical point and away from the static limit.
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: T V
authors.initials: TV
authors.lastname: Brinzari
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: P
authors.initials: P
authors.lastname: Chen
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: Q-C
authors.initials: QC
authors.lastname: Sun
authors.affiliation: Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA.
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.affiliation: National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA.
authors.forename: L-C
authors.initials: LC
authors.lastname: Tung
authors.affiliation: National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Schlueter
authors.affiliation: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: J
authors.initials: J
authors.lastname: Singleton
authors.affiliation: Department of Chemistry and Biochemistry, Eastern Washington University, Cheney, Washington 99004, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Manson
authors.affiliation: Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA.
authors.forename: M-H
authors.initials: MH
authors.lastname: Whangbo
authors.affiliation: Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Litvinchuk
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Musfeldt