Magnetism in the high-Tc analogue Cs2AgF4 studied with muon-spin relaxation

Details Magnetism in the high-Tc analogue Cs2AgF4 studied with muon-spin relaxation Magnetism in the high-Tc analogue Cs2AgF4 studied with muon-spin relaxation

2007-04-04

arxiv.org/abs/0704.0604v1

Phys. Rev. B 75, 220408(R) (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.75.220408

We present the results of a muon-spin relaxation study of the high-Tc analogue material Cs2AgF4. We find unambiguous evidence for magnetic order, intrinsic to the material, below T_C=13.95(3) K. The ratio of inter- to intraplane coupling is estimated to be |J'/J|=1.9 x 10^-2, while fits of the temperature dependence of the order parameter reveal a critical exponent beta=0.292(3), implying an intermediate character between pure two- and three- dimensional magnetism in the critical regime. Above T_C we observe a signal characteristic of dipolar interactions due to linear F-mu-F bonds, allowing the muon stopping sites in this compound to be characterized.

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