From order to randomness: Onset and evolution of the random-singlet state in bond-disordered 
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Shiroka, T.; Eggenschwiler, F.; Ott, H. R.; Mesot, J.

doi:10.1103/physrevb.99.035116

Cited by 10 publications

(6 citation statements)

References 41 publications

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“…The RS state consists of pairs of spin singlets, where the longrange singlets are much weaker than the short ones and the singlets cannot cross 25 . This state has been found universal for a broad class of 1d spin models with random couplings [27][28][29] and has been reported recently in spin-chain materials such as Ba 5 CuIr 3 O 12 30 and BaCu 2 (Si 1−x Ge x ) 2 O 31 .…”

Section: Introductionsupporting

confidence: 62%

Characterizing random-singlet state in two-dimensional frustrated quantum magnets and implications for the double perovskite Sr$_2$CuTe$_{1-x}$W$_{x}$O$_6$

Ren,

Xiong,

et al. 2020

Preprint

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Motivated by the recent experimental observations of spin-liquid-like behaviors in the compound double perovskite Sr2CuTe1−xWxO6, which realizes the simultaneous tuning of frustration and disorder, we study the spin-1/2 Heisenberg model with the randomly distributed nearest-neighbor (J1) and next-nearest-neighbor (J2) interactions on the square lattice. By using the large-scale density matrix renormalization group (DMRG) calculation on cylinder system with circumference up to 10 lattice sites, we identify a disordered phase between the Néel and the stripe magnetic order phase with growing ratio J2/J1 in the strong randomness regime. The vanished spin-freezing parameter indicates the absent spin glass order in this disordered phase. The large-size DMRG results unveil that the spin-freezing parameter decays with system length Lx as L −1/2 x and the mean spin correlation decays as r −2 as a function of distance r, which follow the same size dependences in the onedimensional random singlet (RS) state. We propose this disordered state as a two-dimensional analog of the RS state in one dimension. The analysis of the formed different clusters in this RS state demonstrates the existence of the orphan spins, which may account for the gapless excitations. Our results indicate that this RS state may belong to the same fixed point as the RS state found in the random J − Q model, and the large-scale DMRG simulation opens new opportunities for further studies on frustrated antiferromangets with disorder. We also discuss the implications of our results for understanding the spin-liquid-like compound Sr2CuTe1−xWxO6.

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Section: Introductionsupporting

confidence: 62%

Characterizing random-singlet state in two-dimensional frustrated quantum magnets and implications for the double perovskite Sr$_2$CuTe$_{1-x}$W$_{x}$O$_6$

Ren,

Xiong,

et al. 2020

Preprint

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“…On the other side, certain types of quenched disorders in QSL candidates are suggested to expedite a quantum disordered or random-singlet state against long-range magnetic order [9][10][11][12][13][14][15][16]. The conspicuous effects of the disorder have been showcased in the H-intercalated iridate H 3 LiIr 2 O 6 [17,18].…”

Section: Introductionmentioning

confidence: 99%

Coexistence of random singlets and disordered Kitaev spin liquid in H3LiIr2O6

Lee

Choi

et al. 2023

Phys. Rev. B

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We combine static magnetic susceptibility χ (T ), muon-spin relaxation, and 1 H nuclear magnetic resonance measurements to explore the spin dynamics in the disordered-induced quantum spin liquid candidate H 3 LiIr 2 O 6 . Inverse Laplace transform analysis of the 1 H spin-lattice relaxation rate 1/T 1 enables us to identify two characteristic temperatures T g = 110 K and T * = 26 K. Below T g , a slower 1/T slow 1 component dictated by gapped excitations with a spin gap h = 30-38 K evolves distinctly from a faster 1/T fast 1 component pertaining to gapless excitations. Furthermore, we observe a sub-Curie divergent χ (T ) ∝ T −0.68 , a power-law dependent 1/T fast 1 ∝ T 1.4 , and a weakly activated 1/T slow 1 ∝ exp(− l /k B T ) ( l = 3-6 K) below T * = 26 K. All these features suggest the coexistence of a disordered spin-liquid state and spin singlets with spatially distributed gaps.

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“…This indicates a distribution of relaxation rates, reflecting the inequivalence of NMR sites, in turn due to the intrinsic disorder (see, for instance, refs. [36,37]). However, we find that both parameters depend only weakly on temperature and show no discontinuities or an unusual behaviour near T c .…”

Section: Detection Of the Hebel-slichter Peak Viamentioning

confidence: 99%

$s$-wave superconductivity in the noncentrosymmetric W$_3$Al$_2$C superconductor: An NMR study

Tay,

Shang,

et al. 2022

Preprint

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We report on a microscopic study of the noncentrosymmetric superconductor W 3 Al 2 C (with T c = 7.6 K), mostly by means of 27 Al-and 13 C nuclear magnetic resonance (NMR). Since in this material the density of states at the Fermi level is dominated by the tungsten's 5d orbitals, we expect a sizeable spin-orbit coupling (SOC) effect. The normal-state electronic properties of W 3 Al 2 C resemble those of a standard metal, but with a Korringa product 1/(T 1 T ) significantly smaller than that of metallic Al, reflecting the marginal role played by s-electrons. In the superconducting state, we observe a reduction of the Knight shift and an exponential decrease of the NMR relaxation rate 1/T 1 , typical of s-wave superconductivity. This is further supported by the observation of a small but distinct coherence peak just below T c in the 13 C NMR relaxation-rate, in agreement with the fully-gapped superconducting state inferred from the electronic specificheat data well below T c . The above features are compared to those of members of the same family, in particular, Mo 3 Al 2 C, often claimed to exhibit unconventional superconductivity. We discuss why, despite the enhanced SOC, W 3 Al 2 C does not show spin-triplet features in its superconducting state and consider the broader consequences of our results for noncentrosymmetric superconductors in general.

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From order to randomness: Onset and evolution of the random-singlet state in bond-disordered BaCu2(Si1−xGex)2

Cited by 10 publications

References 41 publications

Characterizing random-singlet state in two-dimensional frustrated quantum magnets and implications for the double perovskite Sr$_2$CuTe$_{1-x}$W$_{x}$O$_6$

Characterizing random-singlet state in two-dimensional frustrated quantum magnets and implications for the double perovskite Sr$_2$CuTe$_{1-x}$W$_{x}$O$_6$

Coexistence of random singlets and disordered Kitaev spin liquid in H3LiIr2O6

$s$-wave superconductivity in the noncentrosymmetric W$_3$Al$_2$C superconductor: An NMR study

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