A New Quasi-one-dimensional Spin Chain and Its Critical Behavior

Abstract

The critical exponent, power of critical behavior near phase transition and critical point, depends on global properties such as the space dimensionality, the symmetry of the order parameter, and the range of interaction, rather than microscopic details. For example, there have been plenty of investigation about the critical phenomena associated with space and spin dimensions of the quantum magnet. Here we introduce a new quasi-one-dimensional spin chain compound NiTe2O5. Performing a comprehensive study of the structure and magnetic properties, we found that NiTe2O5 undergoes intriguing long-range antiferromagnetic order at TN = 30.5 K. Below the Neel temperature, longitudinal component of Ni2+ spin-1 along the chain are ferromagnetically ordered but transverse component has alternating ferromagnetic-antiferromagnetic coupling. In addition, temperature evolution of the antiferromagnetic order parameter accompanies an unconventional critical behavior. In this talk, we present and discuss the physical properties and the nature of the phase transition of NiTe2O5.