The symmetry of the spin Hamiltonian in herbertsmithite, a spin-1/2 kagomé lattice

Details The symmetry of the spin Hamiltonian in herbertsmithite, a spin-1/2 kagomé lattice The symmetry of the spin Hamiltonian in herbertsmithite, a spin-1/2 kagomé lattice

2008-04-30

arxiv.org/abs/0804.4781v4

Phys. Rev. B 79, 134424 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.79.134424

We present magnetization measurements on oriented powder of ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$ along and perpendicular to the orienting field. We find a dramatic difference in the magnetization between the two directions. It is biggest at low measurement fields $H$ or high temperatures. We show that the difference at high temperatures must emerge from Ising-like exchange anisotropy. This allows us to explain muon spin rotation data at $T\to 0$ in terms of an exotic ferromagnetic ground state.

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