2007/07/13 by J. A. Quilliam, K. A. Ross, Kate A. Ross +6
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Antiferromagnetism #Condensed matter physics #Dipole #Ferromagnetism #Heisenberg model #Physics #Physics of Superconductivity and Magnetism #Pyrochlore #Quantum mechanics #Spin (aerodynamics) #Spin wave #Thermodynamics #cond-mat.stat-mech #earthquake and tectonic studies
paper · pdf · doi:10.1103/physrevlett.99.097201
published as Phys. Rev. Lett. 99, 097201 (2007)
arxiv created 2007/07/13 · openalex publication_date 2007/08/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have measured the low-temperature specific heat of the geometrically frustrated pyrochlore Heisenberg antiferromagnet Gd2Sn2O7 in zero magnetic field. The specific heat is found to drop exponentially below approximately 350 mK. This provides evidence for a gapped spin-wave spectrum due to an anisotropy resulting from single-ion effects and long-range dipolar interactions. The data are well fitted by linear spin-wave theory, ruling out unconventional low-energy magnetic excitations in this system, and allowing a determination of the pertinent exchange interactions in this material.