2007/05/17 by H. Tsujii, C. R. Rotundu, T. Ono +7 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Frustration #Heisenberg model #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic refrigeration #Magnetization #Order (exchange) #Phase (matter) #Phase diagram #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Specific heat #Spin (aerodynamics) #Spins #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.060406
published as Phys. Rev. B 76, 060406(R) (2007), with a few small changes · 4 pages, 5 figures
arxiv created 2007/05/17 · openalex publication_date 2007/08/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The specific heat and magnetocaloric effect are used to probe the field-induced up-up-down (UUD) phase of Cs2CuBr4, a quasi-two-dimensional spin-(1)/(2) triangular antiferromagnet with near-maximal frustration. The transitions between the commensurate UUD phase and the incommensurate phases adjacent to it are clearly first order, at least at low temperatures. The shape of the magnetic phase diagram shows that the UUD phase is stabilized by quantum fluctuations, not by thermal fluctuations as in the corresponding phase of classical spins. The magnon gaps determined from the specific heat are considerably larger than those expected for a Heisenberg antiferromagnet.