Magnetism in Azurite Studied by Muon Spin Rotation (a status report) M. Kraken, S. Süllow and F.J. Litterst IPKM, TU Braunschweig A.U.B. Wolter, IFW Dresden.

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Magnetism in Azurite Studied by Muon Spin Rotation (a status report) M. Kraken, S. Süllow and F.J. Litterst IPKM, TU Braunschweig A.U.B. Wolter, IFW Dresden B. Wolf and M. Lang, Phys. Inst. Univ. Frankfurt a.M. Ch. Baines and H. Luetkens, PSI, Villigen (Switzerland) HFI-NQI 2010, CERN

Albrecht Altdorfer ca Emperor Maximilian‘s triumph use as pigment (typical during Renaissance)

Azurite Cu 3 (CO 3 ) 2 (OH) 2 Belokoneva et al., PCM 2001 is there magnetic order? role of inter-chain coupling? or anisotropy? (DM) Various coupling scenarios Frustration? dimer monomer model for a Heisenberg S=1/2 chain

K. Rule et al

Kikuchi et al., PRL 2005 our µSR Earlier µSR data: Kikuchi et al, Prog. Theor. Phys. Suppl indications for static order below T N coupling within dimers coupling of monomers inter-chain? dimer-dimer!

µ + SR: - magnetically ordered fractions - spontaneous muon spin rotation frequencies in ordered state - inhomogeneous and homogeneous broadening - critical slowing-down Samples: single-crystal and powder (same as used for neutron experiments, C. Gibson et al, PRB 81, 2010)

location of µ + ? probably close to O, not yet clarified From recent neutron scattering (C. Gibson et al): Cu 2+ monomer moment ~ 0.68 µ B Cu 2+ in dimer ~ 0.25 µ B

from µSR in transverse magnetic field, polycrystalline sample magnetic fraction T N strongly broadened short range order above T N

Above about 6 K: mainly Gaussian damping due to static nuclear moments Below about 6 K: one fast + one slowly damped signal: electronic spin fluctuations Zero field µSR

T(K) λ T =γ μ 2 τ S (µs -1 ) TNTN ~(T-T N ) -0.9 damping of slowly damped signal above T N for polycrystal critical behavior? Probably not! Short-range order above T N !

T dependence of weakly damped signal above T N for single crystal much weaker T-dependence! slowing-down of spinon excitations?

(at least) 2 “spontaneously“ rotating signals below T N For single crystal, not observed in polycrystal

T N =1.8 K T(K) about 80% of signal about 20% of signal close to monomer? close to dimer? f(MHz) spontaneous muon spin rotation frequencies β≈0.28(5) neutrons: β≈0.12?? extinctions effects! (Rule) static order!

Transverse damping of µ + close to still another transition, see also neutron (Rule et al) and elastic data (Cong et al 2009)

Summary: - polycrystal: short range order above T N =1.8K - damping above T N : τ S ~ (T-T N ) -0.9, critical? Probably not! - τ S are on the order of tens to hundreds of ns (from “LF decoupling experiments“): dynamic sro - static magnetic order below T N ≈ 1.9K, strongly broadened - single crystal: well defined T N =1.8 K - damping above T N : much weaker T dependence than for polycrystal, spinons? - at least 2 spontaneous muon spin rotation frequencies (different sites), magnetization curve - despite muon sites are not yet identified: ordered Cu moments can only be on the order of tenths of µ B (see neutron data) - indications for a further magnetic change below 0.5K - reason for 3D order still not clarified No “simple“ model system!