Magnetic field induced quantum phase transition of theS=12antiferromagnetK2NaCrO8 Academic Article uri icon

  •  
  • Overview
  •  
  • Research
  •  
  • Identity
  •  
  • Additional Document Info
  •  
  • View All
  •  

abstract

  • The magnetic properties of alkali-metal peroxychromate K$_2$NaCrO$_8$ are governed by the $S = 1/2$ pentavalent chromium cation, Cr$^{5+}$. Specific heat, magnetocalorimetry, ac magnetic susceptibility, torque magnetometry, and inelastic neutron scattering data have been acquired over a wide range of temperature, down to 60 mK, and magnetic field, up to 18 T. The magnetic interactions are quasi-two-dimensional prior to long-range ordering, where $T_N = 1.66$ K in $H = 0$. In the $T \to 0$ limit, the magnetic field tuned antiferromagnetic-ferromagnetic phase transition suggests a critical field $H_c = 7.270$ T and a critical exponent $\alpha = 0.481 \pm 0.004$. The neutron data indicate the magnetic interactions may extend over intra-planar nearest-neighbors and inter-planar next-nearest-neighbor spins.

authors

  • Nellutla, S
  • Pati, M
  • Jo, Y-J
  • Zhou, HD
  • Moon, BH
  • Pajerowski, DM
  • Yoshida, Y
  • Janik, JA
  • Balicas, L
  • Lee, Y
  • Meisel, MW
  • Takano, Y
  • Wiebe, Christopher
  • Dalal, NS

publication date

  • February 1, 2010