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001048338 037__ $$aFZJ-2025-04560
001048338 1001_ $$0P:(DE-Juel1)203359$$aHeinze, Leonie$$b0$$eCorresponding author$$ufzj
001048338 1112_ $$aInternational Conference on Highly Frustrated Magnetism$$cToronto$$d2025-05-25 - 2025-05-30$$gHFM$$wCanada
001048338 245__ $$aQuantum criticality and dimensional reduction in the frustrated sawtooth chain compound atacamite
001048338 260__ $$c2025
001048338 3367_ $$033$$2EndNote$$aConference Paper
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001048338 520__ $$aWe present evidence for the presence of a field-induced quantum critical point (QCP) at 21.9(1) T (H || c axis) in the frustrated quantum magnet atacamite Cu$_2$Cl(OH)$_3$, a mineral which we have recently identified as a material realization of sawtooth chains [J ~ 336 K (basal-basal), J' ~ 102 K (basal-apical)]. Residual interchain couplings lead to long-range antiferromagnetic order in atacamite below $T_\mathrm{N}$ = 8.9(1) K. Through extensive high-field studies of the heat capacity, we were able to map the entropy landscape of atacamite up to 35 T. It features highly distorted isentropes indicative of quantum criticality in the material. By further combining macroscopic and microscopic high-field measurement techniques, we provide evidence for the QCP at 21.9(1) T to separate field regions with and without long-range magnetic order, but far away from full polarization of the material. Underpinned by numerical results we propose this behavior to be relatedto an effective dimensional reduction of the material, where the chains decouple into independent subunits. We interpret this behavior as a special type of dimensional reduction caused by the interchain network.
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001048338 65027 $$0V:(DE-MLZ)SciArea-120$$2V:(DE-HGF)$$aCondensed Matter Physics$$x1
001048338 65017 $$0V:(DE-MLZ)GC-1604-2016$$2V:(DE-HGF)$$aMagnetic Materials$$x0
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001048338 7001_ $$0P:(DE-HGF)0$$aKotte, T.$$b1
001048338 7001_ $$0P:(DE-HGF)0$$aRausch, R.$$b2
001048338 7001_ $$0P:(DE-HGF)0$$aDemuer, A.$$b3
001048338 7001_ $$0P:(DE-HGF)0$$aLuther, S.$$b4
001048338 7001_ $$0P:(DE-HGF)0$$aFeyerherm, R.$$b5
001048338 7001_ $$0P:(DE-HGF)0$$aAmmerlaan, A. A. L. N.$$b6
001048338 7001_ $$0P:(DE-HGF)0$$aZeitler, U.$$b7
001048338 7001_ $$0P:(DE-HGF)0$$aGorbunov, D. I.$$b8
001048338 7001_ $$0P:(DE-HGF)0$$aUhlarz, M.$$b9
001048338 7001_ $$0P:(DE-HGF)0$$aRule, K. C.$$b10
001048338 7001_ $$0P:(DE-HGF)0$$aWolter, A. U. B.$$b11
001048338 7001_ $$0P:(DE-HGF)0$$aKühne, H.$$b12
001048338 7001_ $$0P:(DE-HGF)0$$aWosnitza, J.$$b13
001048338 7001_ $$0P:(DE-HGF)0$$aKarrasch, C.$$b14
001048338 7001_ $$0P:(DE-HGF)0$$aSüllow, S.$$b15
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