title: Unconventional T-H phase diagram in the noncentrosymmetric compound Yb2Fe12P7.
abstract: The temperature-(T-)magnetic-field (H) phase diagram for the noncentrosymmetric compound Yb(2)Fe(12)P(7), [corrected] determined from electrical resistivity (ρ), specific heat (C), and magnetization (M) measurements on single crystal specimens, is reported. This system exhibits a crossover from a magnetically ordered non-Fermi-liquid (NFL) phase at low H to another NFL phase at higher H. The crossover occurs near the value of H where the magnetic ordering temperature (T(M)) is no longer observable in C(T,H)/T and ρ(T,H), but not where T(M) extrapolates smoothly to T=0 K at a possible quantum critical point (QCP). This indicates the occurrence of a quantum phase transition between the two NFL phases. The lack of a clear relationship between the extrapolated QCP and NFL behavior suggests an unconventional route to the NFL ground states.
authors.affiliation: Department of Physics, University of California, San Diego, La Jolla, California 92093, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Baumbach
authors.forename: J J
authors.initials: JJ
authors.lastname: Hamlin
authors.forename: L
authors.initials: L
authors.lastname: Shu
authors.forename: D A
authors.initials: DA
authors.lastname: Zocco
authors.forename: J R
authors.initials: JR
authors.lastname: O'Brien
authors.forename: P-C
authors.initials: PC
authors.lastname: Ho
authors.forename: M B
authors.initials: MB
authors.lastname: Maple