C. Baines

Quantum magnetism in the paratacamite family : Towards an ideal kagomé lattice

We report muon spin rotation measurements on the S=1/2 (Cu2+) paratacamite ZnxCu4-x(OH)6Cl2 family. Despite a Weiss temperature of approximately -300 K, the x=1 compound is found to have no transition to a magnetic frozen state down to 50 mK as theoretically expected for the kagomé Heisenberg antiferromagnet. We find that the limit between a dynamical and a partly frozen ground state occurs around x=0.5. For x=1, we discuss the relevance to a singlet picture.

Magnetic density of states at low energy in geometrically frustrated systems

Using muon-spin-relaxation measurements we show that the pyrochlore compound Gd(2)Ti(2)O(7), in its magnetically ordered phase below approximately 1 K, displays persistent spin dynamics down to temperatures as low as 20 mK. The characteristics of the induced muon relaxation can be accounted for by a scattering process involving two magnetic excitations, with a density of states characterized by an upturn at low energy and a small gap depending linearly on the temperature. We propose that such a density of states is a generic feature of geometrically frustrated magnetic materials.

Spin-glass state inCuGa2O4

Magnetic susceptibility, magnetization, specific heat and positive muon spin relaxation (musr) measurements have been used to characterize the magnetic ground-state of the spinel compound

Direct evidence for a dynamical ground state in the highly frustrated Tb(2)Sn(2)O(7) pyrochlore.

rm CuGa_2O_4

Singlet Ground State of the Quantum Antiferromagnet Ba3CuSb2O9

. We observe a spin-glass transition of the S=1/2

Frustrated magnetism in the quantum Kagome Herbertsmithite ZnCu3(OH)6Cl2 antiferromagnet

rm Cu^{2+}

muSR Study of the Quantum Dynamics in the Frustrated S = 3/2 Kagome Bilayers

spins below

Spin liquid state in the 3D frustrated antiferromagnet PbCuTe2O6: NMR and muon spin relaxation studies

rm T_f=2.5K

Competing interactions and magnetic frustration in Yb4LiGe4

characterized by a cusp in the susceptibility curve which suppressed when a magnetic field is applied. We show that the magnetization of

Study of the magnetic properties of Ce3Pd20Si6 compound

rm CuGa_2O_4