• 
  Piatek, J.O.; Dalla Piazza, B.; Nikseresht, N.; Tsyrulin, N.; Zivkovic, I.; Krämer, K.W.; Laver, M.; Prokes, K.; Matas, S.; Christensen, N.B.; Ronnow, H.M.: Phase diagram with an enhanced spin-glass region of the mixed Ising-XY magnet LiHo_xEr_1-xF₄. Physical Review B 88 (2013), p. 014408/1-11

10.1103/PhysRevB.88.014408
Open Access Version

Abstract:
We present the experimental phase diagram of LiHoxEr1-xF4, a dilution series of dipolar-coupled model magnets. The phase diagram was determined using a combination of ac susceptibility and neutron scattering. Three unique phases in addition to the Ising ferromagnet LiHoF4 and the XY antiferromagnet LiErF4 have been identified. Below x = 0.86, an embedded spin-glass phase is observed, where a spin glass exists within the ferromagnetic structure. Below x = 0.57, an Ising spin glass is observed consisting of frozen needlelike clusters. For x ∼ 0.3–0.1, an antiferromagnetically coupled spin glass occurs. A reduction of TC(x) for the ferromagnet is observed which disobeys the mean-field predictions that worked for LiHoxY1-xF4.