NMR investigation on the honeycomb iridate 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ag</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>LiIr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>

Wang, Jiaming; Yuan, Weishi; Imai, Takashi; Singer, Philip M.; Bahrami, Faranak; Tafti, Fazel

doi:10.1103/physrevb.103.214405

Cited by 19 publications

(9 citation statements)

References 42 publications

(65 reference statements)

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“…III A, these datasets are limited to about 1/5th of the ordering temperature. A somewhat similar conclusion of persistent dynamics has been drawn [44,47] based on an analysis of the 7 Li NMR 1/T 1 in the ordered state of ALIO. The natural question is, what is the source of this dynamics?…”

Section: Discussionsupporting

confidence: 73%

“…The near absence of a second peak in the NMR line shape of our sample of ALIO, together with a single exponential recovery in T 1 and with the absolute value of the 7 Li NMR relaxation rate 1/T 1 on the higher side, we conclude that our sample is similar to sample A of Ref. [44].…”

Section: B Nmrsupporting

confidence: 63%

“…We now contrast our observations with those reported in the very recent reference [44] performed on two different batches of samples (A and B) of ALIO. Wang et al found that the cleaner sample A showed a single peak in the NMR spectrum as opposed to two peaks for sample B.…”

Section: B Nmrcontrasting

confidence: 53%

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Unusual spin dynamics in the low-temperature magnetically ordered state of Ag3LiIr2O6

et al. 2021

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Recently, there have been contrary claims of Kitaev spin-liquid behavior and ordered behavior in the honeycomb compound Ag 3 LiIr 2 O 6 based on various experimental signatures. Our investigations on this system reveal a low-temperature ordered state with persistent dynamics down to the lowest temperatures. Magnetic order is confirmed by clear oscillations in the muon spin relaxation (μSR) time spectrum below 9 K until 52 mK. Coincidentally in 7 Li nuclear magnetic resonance, a wipeout of the signal is observed below ∼10 K, which again strongly indicates magnetic order in the low-temperature regime. This is supported by our density functional theory calculations which show an appreciable Heisenberg exchange term in the spin Hamiltonian that favors magnetic ordering. The 7 Li shift and spin-lattice relaxation rate also show anomalies at ∼50 K. They are likely related to the onset of dynamic magnetic correlations, but their origin is not completely clear. Detailed analysis of our μSR data is consistent with a coexistence of incommensurate Néel and striped environments. A significant and undiminished dynamical relaxation rate (∼5 MHz) as seen in μSR deep into the ordered phase indicates enhanced quantum fluctuations in the ordered state.

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Section: Discussionsupporting

confidence: 73%

Section: B Nmrsupporting

confidence: 63%

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Unusual spin dynamics in the low-temperature magnetically ordered state of Ag3LiIr2O6

et al. 2021

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“…The advantage of the conventional stretched fit analysis of the 1/T 1 recovery curve M (t) is that one can determine the experimental value of 1/T 1 quite easily, even if the signal to noise ratio is poor. However, as we repeatedly cautioned in our earlier works on charge ordered high T c cuprates La 1.875 Ba 0.125 CuO 4 [38] and La 1.885 Sr 0.115 CuO 4 [44], proximate Kitaev spin liquid materials Cu 2 IrO 3 [45] and Ag 3 LiIr 2 O 6 [46], as well as Zn-barlowite and herbertsmithite kagome lattice [15], the stretched fit result of 1/T 1 is only an approximate estimation of 1/T 1 averaged over the entire sample. When 1/T 1 develops large distributions, it is not always justifiable to rely on the stretched fit, unless the distribution is known to take a certain functional form [47].…”

Section: Determination Of 1/t1mentioning

confidence: 79%

Freezing of the Lattice in the Kagome Lattice Heisenberg Antiferromagnet Zn-barlowite ZnCu$_3$(OD)$_6$FBr

Wang,

Yuan,

Singer

et al. 2021

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We use 79 Br nuclear quadrupole resonance (NQR) to demonstrate that ultra slow lattice dynamics set in below the temperature scale set by the Cu-Cu super-exchange interaction J ( 160 K) in the kagome lattice Heisenberg antiferromagnet Zn-barlowite. The lattice completely freezes below 50 K, and 79 Br NQR lineshapes become twice broader due to increased lattice distortions. Moreover, the frozen lattice exhibits an oscillatory component in the transverse spin echo decay, a typical signature of pairing of nuclear spins by indirect nuclear spin-spin interaction. This indicates that some Br sites form structural dimers via a pair of kagome Cu sites prior to the gradual emergence of spin singlets below ∼ 30 K. Our findings underscore the significant roles played by subtle structural distortions in determining the nature of the disordered magnetic ground state of the kagome lattice.

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“…Inspired by this and other works on Majorana-Fermi surfaces [15][16][17][18][19][20][21][22][23][24], in this letter we combine theoretical and experimental techniques to address whether or not the specific heat data of the silver-lithium iridate (Ag 3 LiIr 2 O 6 ) suggests the presence of a Majorana-Fermi surface. The silver-lithium iridate has recently been proposed as a promising spin liquid candidate [25,26], with an enhanced trigonal distortion in the lattice of this com-pound (see Supplementary Material) supporting proximity to the Kitaev QSL phase due to considerable offdiagonal exchange interactions [27][28][29][30]. In a similar vein, a comparative study of the magnetic susceptibility, heat capacity, and muon spin relaxation of Ag 3 LiIr 2 O 6 hints at some form of incommensurate AFM order [31], a phase previously suggested to coexist with the spin liquid state and dependent on a finite off-diagonal exchange term in the Kitaev Hamiltonian [7].…”

mentioning

confidence: 99%

Signatures of a Majorana-Fermi surface in the Kitaev magnet Ag$_3$LiIr$_2$O$_6$

Heath¹,

Bahrami²,

Lee³

et al. 2021

Preprint

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Detecting Majorana fermions in experimental realizations of the Kitaev honeycomb model is often complicated by non-trivial interactions inherent to potential spin liquid candidates, where the interplay of exotic forms of quantum magnetism often leads to false indications of novel spin excitations. In this letter, we propose several distinct thermodynamic signatures of massive, itinerant Majorana fermions within the well-established analytical paradigm of Landau-Fermi liquid theory. We find that all salient features of the theory are confirmed in the specific heat measurements of the Kitaev spin liquid candidate Ag3LiIr2O6. Our study is the first of its kind to present strong evidence for a Fermi liquid-like ground state in the fundamental excitations of a honeycomb iridate, and opens new experimental avenues to detect itinerant Majorana fermions in condensed matter as a whole.

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NMR investigation on the honeycomb iridate Ag3LiIr2O6

Cited by 19 publications

References 42 publications

Unusual spin dynamics in the low-temperature magnetically ordered state of Ag3LiIr2O6

Unusual spin dynamics in the low-temperature magnetically ordered state of Ag3LiIr2O6

Freezing of the Lattice in the Kagome Lattice Heisenberg Antiferromagnet Zn-barlowite ZnCu$_3$(OD)$_6$FBr

Signatures of a Majorana-Fermi surface in the Kitaev magnet Ag$_3$LiIr$_2$O$_6$

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