2017 CAP Congress / Congrès de l'ACP 2017

Single crystal NMR investigation of S = 1/2 kagome Heisenberg antiferromagnet

30 May 2017, 13:30

30m

BioSci 1102 (Queen's University)

Invited Speaker / Conférencier invité Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) T3-1 Geometrically Frustrated Materials (DCMMP) | Matériaux géométriquement frustrés (DPMCM)

Speaker

Takashi Imai (McMaster University)

Description

Herbertsmithite ZnCu_(3)OH_(6)Cl_(2) is a mineral material that hosts a kagome plane consisting of Cu2+ ions with spin S = 1/2. We will discuss our single crystal NMR measurements to probe the local spin susceptibility (based on the NMR frequency shift), low frequency spin fluctuations (based on the spin-lattice relaxation rate 1/T_1), and the effects of defect Cu2+ spins occupying the Zn2+ sites. We will show that both the local spin susceptibility and spin fluctuations in low magnetic fields show a signature of a small energy gap in the excitation spectrum [1,2].

Ref.
[1] M. Fu et al., Science 350 (2015) 655 and references therein.
[2] N. E. Sherman et al., Phys. Rev. B 94 (2016) 140415R.