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

Lancaster, T; Xiao, F; Huddart, BM; Williams, RC; Pratt, FL; Blundell, SJ; Clark, SJ; Scheuermann, R; Goko, T; Ward, S; Manson, JL; Rüegg, Ch; Krämer, KW

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F Xiao

RC Williams

FL Pratt

SJ Blundell

R Scheuermann

T Goko

S Ward

JL Manson

Ch Rüegg

KW Krämer


We present 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. We locate 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.


Lancaster, T., Xiao, F., Huddart, B., Williams, R., Pratt, F., Blundell, S., …Krämer, K. (2018). Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy. New Journal of Physics, 20(10), Article 103002.

Journal Article Type Article
Acceptance Date Sep 3, 2018
Online Publication Date Oct 3, 2018
Publication Date Oct 3, 2018
Deposit Date Oct 5, 2018
Publicly Available Date Oct 10, 2018
Journal New Journal of Physics
Electronic ISSN 1367-2630
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 20
Issue 10
Article Number 103002
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Copyright Statement
Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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