2004/07/29 by Alexander Bühler, Götz S. Uhrig, J. Oitmaa +1
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Quantum and electron transport phenomena #Spectroscopy and Quantum Chemical Studies #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.70.214429
published as Phys. Rev. B 70, 214429 (2004) · 10 pages, 8 figures included
arxiv created 2004/07/29 · openalex publication_date 2004/12/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A high-order series expansion is employed to study the thermodynamical properties of a S=1∕2 chain coupled to dispersionless phonons. The results are obtained without truncating the phonon subspace since the series expansion is performed formally in the overall exchange coupling J. The results are used to investigate various parameter regimes, e.g., the adiabatic and antiadiabatic limit as well as the intermediate regime, which is difficult to investigate by other methods. We find that dynamic phonon effects become manifest when more than one thermodynamic quantity is analyzed.