Lack of Evidence for a Singlet Crystal Field Ground State in the Tb2Ti2O7 Magnetic Pyrochlore

Autor:	Gaulin, B. D., Gardner, J. S., McClarty, P. A., Gingras, M. J. P.
Rok vydání:	2011
Předmět:	Condensed Matter - Disordered Systems and Neural Networks Condensed Matter - Other Condensed Matter
Zdroj:	Phys. Rev. B 84, 140402 (2011)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.84.140402
Popis:	We present new high resolution inelastic neutron scattering data on the candidate spin liquid Tb2Ti2O7. We find that there is no evidence for a zero field splitting of the ground state doublet within the 0.2 K resolution of the instrument. This result contrasts with a pair of recent works on Tb2Ti2O7 claiming that the spin liquid behavior can be attributed to a 2 K split singlet-singlet single-ion spectrum at low energies. We also reconsider the entropy argument presented in Chapuis {\it et al.} as further evidence of a singlet-singlet crystal field spectrum. We arrive at the conclusion that estimates of the low temperature residual entropy drawn from heat capacity measurements are a poor guide to the single ion spectrum without understanding the nature of the correlations. Comment: 4 pages, 3 figure. Submitted to Physical Review B
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1106.1402 Zobrazit plný text záznamu View this record from Arxiv