Details

Autor(en) / Beteiligte

• Quilliam, J A
• Ross, K A
• Del Maestro, A G
• Gingras, M J P
• Corruccini, L R
• Kycia, J B

Titel

Evidence for gapped spin-wave excitations in the frustrated Gd2Sn2O7 pyrochlore antiferromagnet from low-temperature specific heat measurements

Ist Teil von

• Physical review letters, 2007-08, Vol.99 (9), p.097201-097201

Ort / Verlag

United States

Erscheinungsjahr

2007

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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.