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Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Lancaster T, Xiao F, Huddart B M, Williams R C, Pratt F L, Blundell S J, Clark S J, Scheuermann R, Goko T, Ward S, Manson J L, Rüegg Ch, Krämer K W,
Project New materials for honeycomb-lattice and single-ion magnets
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Original article (peer-reviewed)

Journal New Journal of Physics
Volume (Issue) 20(10)
Page(s) 103002 - 103002
Title of proceedings New Journal of Physics
DOI 10.1088/1367-2630/aae21a

Open Access

URL http://doi.org/10.1088/1367-2630/aae21a
Type of Open Access Publisher (Gold Open Access)

Abstract

Wepresent the results of muon-spin spectroscopy (μ+SR) measurements on the molecular spin ladder system (Hpip)2CuBr4(1−x)Cl4x, [Hpip=(C5H12N)]. 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)2CuBr4. Comparison of our results to those of the dimer-based molecular magnet Cu(pyz)(gly)(ClO4) shows several common features.Welocate the crossovers in partially disordered (Hpip)2CuBr4(1−x)Cl4x (x=0.05), where a region of behaviour intermediate between quantum disordered and Luttinger liquid-like is identified. Our interpretation of the results incorporates an analysis of the probable muon stopping states in (Hpip)2CuBr4 based on density functional calculations and suggests how the muon plus its local distortion can lead to a local probe unit with good sensitivity to the magnetic state. Using longitudinal field μ+SR we compare the dynamic response of the x=1 strong-rung material (Hpip)2CuCl4 to that of the strong-leg material (C7H10N)2CuBr4 (known as DIMPY) and demonstrate that our results are in agreement with predictions based on interacting fermionic quasiparticle excitations in these materials.
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