2018
DOI: 10.1088/1367-2630/aae21a
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Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy

Abstract: We present the results of muon-spin spectroscopy (μ + SR) measurements on the molecular spin ladder system (Hpip) 2 CuBr 4(1−x) Cl 4x , [Hpip=(C 5 H 12 N)]. Using transverse field μ + SR we are able to identify characteristic behaviour in each of the regions of the phase diagram of the x=0 strong-rung spin ladder system (Hpip) 2 CuBr 4 . Comparison of our results to those of the dimer-based molecular magnet Cu(pyz)(gly)(ClO 4 ) shows several common features. We locate the crossovers in partially disordered… Show more

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Cited by 15 publications
(9 citation statements)
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“…By combining μSR experiment with DFT, we find that the electronic magnetic moments in the parent material of this series, barlowite, Cu 4 (OH) 6 FBr, are static below T N = 15 K and that μSR spectra can be quantitatively interpreted by the formation of both μ-F and μ-OH complexes. We note that the application of DFT methods may be especially important in the μSR study of QSL candidates, as they allow us to assess not only the location of implanted muons but also the degree of distortion that they cause, thus providing confidence that the muon spin probes the intrinsic properties of the quantum disordered ground state 52 . In this regard, barlowite offers a valuable benchmark for DFT muon-site calculation and its application to other materials in which there is neither long-range magnetic order nor muon complex formation to give any indication as to where muons might implant.…”
Section: Resultsmentioning
confidence: 99%
“…By combining μSR experiment with DFT, we find that the electronic magnetic moments in the parent material of this series, barlowite, Cu 4 (OH) 6 FBr, are static below T N = 15 K and that μSR spectra can be quantitatively interpreted by the formation of both μ-F and μ-OH complexes. We note that the application of DFT methods may be especially important in the μSR study of QSL candidates, as they allow us to assess not only the location of implanted muons but also the degree of distortion that they cause, thus providing confidence that the muon spin probes the intrinsic properties of the quantum disordered ground state 52 . In this regard, barlowite offers a valuable benchmark for DFT muon-site calculation and its application to other materials in which there is neither long-range magnetic order nor muon complex formation to give any indication as to where muons might implant.…”
Section: Resultsmentioning
confidence: 99%
“…We note that the application of DFT methods may be especially important in the µSR study of QSL candidates, as they allow us to assess not only the location of implanted muons but also the degree of distortion that they cause, thus providing confidence that the muon spin probes the intrinsic properties of the quantum disordered ground state [49]. We find that incorporating as little as x = 0.16 of Zn 2+ into the crystal structure of barlowite leads to a suppression of its ordered, frozen fraction, while for x > 0.66 the electronic magnetic moments remain dynamically fluctuating at all measurable temperatures.…”
Section: Discussionmentioning
confidence: 99%
“…Finally, although the μ + SR results agree with the results for interface diffusion expected from calculations, it is important to remember that we do not know for certain how the anti-muons and the lithium ions interact. For example, implantation of a positively charged anti-muon may activate the diffusion process by repelling the lithium ion, moving it within the lattice. Detailed simulations of anti-muons in different materials could provide important insights into this and increase the opportunities to tailor μ + SR to explore specific phenomena.…”
Section: Introductionmentioning
confidence: 99%