Field-induced magnetic transition and spin fluctuations in the quantum spin-liquid candidate 
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Xing, Jie; Sanjeewa, Liurukara D.; Kim, Jungsoo; Stewart, G. R.; Podlesnyak, A.; Sefat, Athena S.

doi:10.1103/physrevb.100.220407

Cited by 84 publications

(73 citation statements)

References 61 publications

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“…These results are consistent with the inductively-coupled plasma measurements of chemical composition of the sample (see method for details). Although Yb ions in the Na layers may be magnetic, our frequency-dependent ac susceptibility measurements down to 90 mK can be well described is centered around the K point, consistent with the previous work [32], and decreases significantly with increasing temperature.…”

supporting

confidence: 91%

Spinon Fermi surface spin liquid in a triangular lattice antiferromagnet NaYbSe2

Dai

Zhang

Xie

et al. 2020

Preprint

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Triangular lattice of rare-earth ions with interacting effective spin-1/2 local moments is an ideal platform to explore the physics of quantum spin liquids (QSLs) in the presence of strong spin-orbit coupling, crystal electric ﬁelds, and geometrical frustration. The Yb delafossites, NaYbCh2 (Ch=O, S, Se) with Yb ions forming a perfect triangular lattice, have been suggested to be candidates for QSLs. Previous thermodynamics, nuclear magnetic resonance, and powder sample neutron scattering measurements on NaYbCh2 have supported the suggestion of the QSL ground states. The key signature of a QSL, the spin excitation continuum, arising from the spin quantum number fractionalization, has not been observed. Here we perform both elastic and inelastic neutron scattering measurements as well as detailed thermodynamic measurements on high-quality single crystalline NaYbSe2 samples to conﬁrm the absence of long-range magnetic order down to 40 mK, and further reveal a clear signature of magnetic excitation continuum extending from 0.1 to 2.5 meV. By comparing the structure of our magnetic excitation spectra with the theoretical expectation from the spinon continuum, we conclude that the ground state of NaYbSe2 is a QSL with a spinon Fermi surface.

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supporting

confidence: 91%

Spinon Fermi surface spin liquid in a triangular lattice antiferromagnet NaYbSe2

Dai

Zhang

Xie

et al. 2020

Preprint

Self Cite

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“…This UUD phase exhibits a magnetization plateau with 1/3 saturated moment ( M s ). Recently, even in QSL candidates A Yb Ch 2 ( A = Na and Cs, Ch = O, S, Se), one TAF family with effective spin-1/2 Yb 3+ ions and easy-plane anisotropy, the UUD phase has been proposed under applied fields 55 – 58 . Experimentally, more complex QSSTs have been observed for Ba 3 CoSb 2 O 9 59 – 65 .…”

Section: Resultsmentioning

confidence: 99%

Survival of itinerant excitations and quantum spin state transitions in YbMgGaO4 with chemical disorder

et al. 2021

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A recent focus of quantum spin liquid (QSL) studies is how disorder/randomness in a QSL candidate affects its true magnetic ground state. The ultimate question is whether the QSL survives disorder or the disorder leads to a “spin-liquid-like” state, such as the proposed random-singlet (RS) state. Since disorder is a standard feature of most QSL candidates, this question represents a major challenge for QSL candidates. YbMgGaO4, a triangular lattice antiferromagnet with effective spin-1/2 Yb3+ions, is an ideal system to address this question, since it shows no long-range magnetic ordering with Mg/Ga site disorder. Despite the intensive study, it remains unresolved as to whether YbMgGaO4 is a QSL or in the RS state. Here, through ultralow-temperature thermal conductivity and magnetic torque measurements, plus specific heat and DC magnetization data, we observed a residual κ0/T term and series of quantum spin state transitions in the zero temperature limit for YbMgGaO4. These observations strongly suggest that a QSL state with itinerant excitations and quantum spin fluctuations survives disorder in YbMgGaO4.

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“…One example is Ba 3 CoSb 2 O 9 , another TAF with effective spin-1/2 Co 2+ ions, which orders around 3.5 K and exhibits a UUD phase at ultralow temperatures [32][33][34] . More recently, the UUD phase also has been proposed for AYbCh 2 (A = Na and Cs, Ch = O, S, Se), one TAF family with effective spin-1/2 Yb 3+ ions [35][36][37][38] . Further detailed experimental and theoretical studies on Ba 3 CoSb 2 O 9 revealed more complex quantum spin state transitions (QSSTs) [39][40][41][42][43][44][45] .…”

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confidence: 99%

Possible itinerant excitations and quantum spin state transitions in the effective spin-1/2 triangular-lattice antiferromagnet Na2BaCo(PO4)2

Huang

Yue

et al. 2020

Nat Commun

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The most fascinating feature of certain two-dimensional (2D) gapless quantum spin liquid (QSL) is that their spinon excitations behave like the fermionic carriers of a paramagnetic metal. The spinon Fermi surface is then expected to produce a linear increase of the thermal conductivity with temperature that should manifest via a residual value (κ 0 /T) in the zerotemperature limit. However, this linear in T behavior has been reported for very few QSL candidates. Here, we studied the ultralow-temperature thermal conductivity of an effective spin-1/2 triangular QSL candidate Na 2 BaCo(PO 4) 2 , which has an antiferromagnetic order at very low temperature (T N~1 48 mK), and observed a finite κ 0 /T extrapolated from the data above T N. Moreover, while approaching zero temperature, it exhibits series of quantum spin state transitions with applied field along the c axis. These observations indicate that Na 2 BaCo (PO 4) 2 possibly behaves as a gapless QSL with itinerant spin excitations above T N and its strong quantum spin fluctuations persist below T N .

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Field-induced magnetic transition and spin fluctuations in the quantum spin-liquid candidate CsYbSe2

Cited by 84 publications

References 61 publications

Spinon Fermi surface spin liquid in a triangular lattice antiferromagnet NaYbSe2

Spinon Fermi surface spin liquid in a triangular lattice antiferromagnet NaYbSe2

Survival of itinerant excitations and quantum spin state transitions in YbMgGaO4 with chemical disorder

Possible itinerant excitations and quantum spin state transitions in the effective spin-1/2 triangular-lattice antiferromagnet Na2BaCo(PO4)2

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