2008/06/16 by R. Dell'Amore, Raffaele Dell’Amore, K. Krämer +2 · 16 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Excited state #Ground state #Magnetic field #Magnetization #Order (exchange) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Singlet state #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.224403
published in Physical Review B 78(22) (American Physical Society) · 8 pages, 10 figures
arxiv created 2008/06/16 · openalex publication_date 2008/12/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
TlCuCl3 is a quantum-spin-(1)/(2) system which shows a gap between the singlet ground state of the Cu2+ dimers and the first excited triplet Sz=+1 state for magnetic fields \ensuremathμ0H\ensuremath\lesssim\ensuremathμ0Hc\ensuremath≈5.5 T. At larger magnetic fields the gap is suppressed, and a Bose-Einstein condensation of triplets is supposed to occur, leading to a magnetic phase with antiferromagnetic long-range order of the transverse spin components. In this study we calculate the fraction of condensed magnetic quasiparticles of TlCuCl3 from magnetization M(T,H) data. At T=0 K and right above the critical field Hc, this fraction is \ensuremath≈98% of the total number of triplons, and is independent of the direction of the magnetic field if we assume the presence of a small intrinsic magnetic background with S=1 magnetic moments.