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• W2892077708 abstract "Recently measurements on various spin-1/2 quantum magnets such as H$_3$LiIr$_2$O$_6$, LiZn$_2$Mo$_3$O$_8$, ZnCu$_3$(OH)$_6$Cl$_2$ and 1T-TaS$_2$ -- all described by magnetic frustration and quenched disorder but with no other common relation -- nevertheless showed apparently universal scaling features at low temperature. In particular the heat capacity C[H,T] in temperature T and magnetic field H exhibits T/H data collapse reminiscent of scaling near a critical point. Here we propose a theory for this scaling collapse based on an emergent random-singlet regime extended to include spin-orbit coupling and antisymmetric Dzyaloshinskii-Moriya (DM) interactions. We derive the scaling $C[H,T]/T sim H^{-gamma} F_q[T/H]$ with $F_q[x] = x^{q}$ at small $x$, with $q in$ (0,1,2) an integer exponent whose value depends on spatial symmetries. The agreement with experiments indicates that a fraction of spins form random valence bonds and that these are surrounded by a quantum paramagnetic phase. We also discuss distinct scaling for magnetization with a $q$-dependent subdominant term enforced by Maxwell's relations." @default.
• W2892077708 created "2018-09-27" @default.
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• W2892077708 date "2018-10-22" @default.
• W2892077708 modified "2023-09-27" @default.
• W2892077708 title "Scaling and data collapse from local moments in frustrated disordered quantum spin systems" @default.
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• W2892077708 doi "https://doi.org/10.1038/s41467-018-06800-2" @default.
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• W2892077708 hasPublicationYear "2018" @default.
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