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001044510 1001_ $$0P:(DE-Juel1)203359$$aHeinze, Leonie$$b0$$eCorresponding author$$ufzj
001044510 245__ $$aAtacamite Cu$_2$Cl(OH)$_3$ in High Magnetic Fields: Quantum Criticality and Dimensional Reduction of a Sawtooth-Chain Compound
001044510 260__ $$aCollege Park, Md.$$bAPS$$c2025
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001044510 520__ $$aWe report an extensive high-field study of atacamite Cu$_2$⁢Cl⁢(OH)$_3$, a material realization of quantum sawtooth chains with weak interchain couplings, in continuous and pulsed magnetic fields up to 58 T. In particular, we have mapped the entropy landscape for fields as high as 35 T and have identified a field-induced quantum critical point at 21.9(1) T for H || c axis. The quantum critical point separates field regions with and without magnetic order, evidenced by our thermodynamic study and $^1$H nuclear magnetic resonance spectroscopy, but lies far below full saturation of the magnetization. Corroborated by numerical results using density-matrix renormalization group calculations, we find this behavior associated with a dimensional reduction of the spin system: the sawtooth chain effectively decouples into an antiferromagnetic spin-1/2 chain (backbone of the sawtooth chain) in the presence of an exchange field produced by the remaining field-polarized spins.
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001044510 65027 $$0V:(DE-MLZ)SciArea-170$$2V:(DE-HGF)$$aMagnetism$$x1
001044510 65017 $$0V:(DE-MLZ)GC-1604-2016$$2V:(DE-HGF)$$aMagnetic Materials$$x0
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001044510 7001_ $$0P:(DE-HGF)0$$aKotte, T.$$b1
001044510 7001_ $$0P:(DE-HGF)0$$aRausch, R.$$b2
001044510 7001_ $$0P:(DE-HGF)0$$aDemuer, A.$$b3
001044510 7001_ $$0P:(DE-HGF)0$$aLuther, S.$$b4
001044510 7001_ $$0P:(DE-HGF)0$$aFeyerherm, R.$$b5
001044510 7001_ $$0P:(DE-HGF)0$$aAmmerlaan, E. L. Q. N.$$b6
001044510 7001_ $$0P:(DE-HGF)0$$aZeitler, U.$$b7
001044510 7001_ $$0P:(DE-HGF)0$$aGorbunov, D. I.$$b8
001044510 7001_ $$0P:(DE-HGF)0$$aUhlarz, M.$$b9
001044510 7001_ $$0P:(DE-HGF)0$$aRule, K. C.$$b10
001044510 7001_ $$0P:(DE-HGF)0$$aWolter, A. U. B.$$b11
001044510 7001_ $$0P:(DE-HGF)0$$aKühne, H.$$b12
001044510 7001_ $$0P:(DE-HGF)0$$aWosnitza, J.$$b13
001044510 7001_ $$0P:(DE-HGF)0$$aKarrasch, C.$$b14
001044510 7001_ $$0P:(DE-HGF)0$$aSüllow, S.$$b15
001044510 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.134.216701$$gVol. 134, no. 21, p. 216701$$n21$$p216701$$tPhysical review letters$$v134$$x0031-9007$$y2025
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