Back to overview

Magnetic entropy landscape and Grüneisen parameter of a quantum spin ladder

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Ryll H., Kiefer K., Rüegg Ch., Ward S., Krämer K. W., Biner D., Bouillot P., Coira E., Giamarchi T., Kollath C.,
Project Dimensional and Anisotropy Control of Model Quantum Magnets
Show all

Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 89(14)
Page(s) 144416 - 5
Title of proceedings Physical Review B
DOI 10.1103/physrevb.89.144416

Open Access

Type of Open Access Repository (Green Open Access)


We present measurements of the magnetic entropy landscape and Gr¨uneisen parameter of the Cu2+ complex (C5H12N)2CuCl4 in a magnetic field. Our thermodynamic measurements are in very good agreement with a theoretical description by a S = 1/2 Heisenberg ladder model. Due to its excellent experimental access, the compound crosses two quantum critical points in the applied range of the magnetic field, first from a gapped unpolarized state to a critical phase and then to a gapped fully polarized state. This behavior is reflected directly in the magnetic entropy map. Due to the remarkable properties of the magnetic Gr¨uneisen parameter, we are able to discuss the validity of critical behavior with respect to temperature and magnetic field for this model quasi-one-dimensional system.