Absence of Magnetic Thermal Conductivity in the Quantum Spin Liquid Candidate 
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Ni, Jiamin; Pan, Baishen; Song, B. Q.; Huang, Yuzhen; Zeng, Jiang; Yu, Yijun; Cheng, Erjian; Wang, L. S.; Dai, D. Z.; Kato, Reìzo; Li, S. Y.

doi:10.1103/physrevlett.123.247204

Cited by 75 publications

(40 citation statements)

References 37 publications

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“…These results, together with the results of Pauli-paramagneticlike low energy excitations revealed by magnetic torque measurements, have been discussed in terms of the spinons that form the Fermi surface [14]. On the other hand, recent thermal conductivity measurements by two groups have reported the vanishingly small κ 0 /T [19,20]. Moreover, it has been reported that κ ph is also strikingly suppressed from that reported in Ref.…”

supporting

confidence: 52%

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2
Yamashita
¹
,
Sato
²
,
Tominaga
³

et al. 2020
Phys. Rev. B
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EtMe 3 Sb[Pd(dmit) 2 ] 2 , an organic Mott insulator with nearly isotropic triangular lattice, is a candidate material for a quantum spin liquid, in which the zero-point fluctuations do not allow the spins to order. The itinerant gapless excitations inferred from the thermal transport measurements in this system have been a hotly debated issue recently. While the presence of a finite linear residual thermal conductivity,has been shown [M. Yamashita et al. Science 328, 1246 (2010)], recent experiments [P. Bourgeois-Hope et al., Phys. Rev. X 9, 041051 (2019); J. M. Ni et al., Phys. Rev. Lett. 123, 247204 (2019)] have reported the absence of κ 0 /T . Here we show that the low-temperature thermal conductivity strongly depends on the cooling process of the sample. When cooling down very slowly, a sizable κ 0 /T is observed. In contrast, when cooling down rapidly, κ 0 /T vanishes and, in addition, the phonon thermal conductivity is strongly suppressed. These results suggest that possible random scatterers introduced during the cooling process are responsible for the apparent discrepancy of the thermal conductivity data in this organic system. The present results provide evidence that the true ground state of EtMe 3 Sb[Pd(dmit) 2 ] 2 is likely to be a quantum spin liquid with itinerant gapless excitations.

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supporting

confidence: 52%

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2
Yamashita
¹
,
Sato
²
,
Tominaga
³

et al. 2020
Phys. Rev. B
Self Cite
27
3
26
0
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“…In reality, so far only the organic EtMe 3 Sb[Pd(dmit) 2 ] 2 reported by Yamashita et al 18,19 and the inorganic 1T-TaS 2 reported by Murayama et al 20 exhibit a non-zero κ 0 /T term, both of which are spin-1/2 TAFs. However, some other groups also reported a zero κ 0 /T term in these two materials, raising a controversy [21][22][23] . For another QSL candidate pyrochlore Tb 2 Ti 2 O 7 , a saturated value of κ/T at 0.3 K was reported which resembles that of a dirty metal 24 .…”

mentioning

confidence: 94%

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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“…The most remarkable and intriguing feature in the QSL state on triangular lattice is that in DMIT and H-Cat the heat capacity has a non-zero linear temperature term γT and thermal conductivity has a finite residual linear term κ 0 /T ≡ κ/T (T → 0) [10,11,15,16]. (Recent measurements report that there are two types of DMIT with and without finite κ 0 /T [17][18][19].) This demonstrates the emergence of gapless spin excitations that behave like mobile charge carriers in a paramagnetic metal with a Fermi surface, although the charge degrees of freedom are gapped.…”

Section: Introductionmentioning

confidence: 99%

Effect of quenched disorder on the quantum spin liquid state of the triangular-lattice antiferromagnet 1T−TaS2

Murayama

Sato

Taniguchi

et al. 2020

Phys. Rev. Research

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A quantum spin liquid (QSL) is an exotic state of matter characterized by quantum entanglement and the absence of any broken symmetry. A long-standing open problem, which is a key for fundamental understanding the mysterious QSL states, is how the quantum fluctuations respond to randomness due to quenched disorder. Transition metal dichalcogenide 1T-TaS2 is a candidate material that hosts a QSL ground state with spin-1/2 on the two-dimensional perfect triangular lattice. Here, we performed systematic studies of low-temperature heat capacity and thermal conductivity on pure, Se-substituted and electron irradiated crystals of 1T-TaS2, where the substitution of S by Se induces weak disorder and electron irradiation induces strong quenched disorder. In pure 1T-TaS2, the linear temperature term of the heat capacity γT and the finite residual linear term of the thermal conductivity in the zero-temperature limit κ0/T ≡ κ/T (T → 0) are clearly resolved, consistent with the presence of gapless spinons with a Fermi surface. Moreover, while the strong magnetic field slightly enhances κ0/T , it strongly suppresses γ. These unusual contrasting responses to magnetic field imply the coexistence of two types of gapless excitations with itinerant and localized characters. Introduction of additional weak random exchange disorder in 1T-Ta(S1−xSex)2 leads to vanishing of κ0/T , indicating that the itinerant gapless excitations are sensitive to the disorder. On the other hand, in both pure and Se-substituted systems, the magnetic contribution of the heat capacity obeys a universal scaling relation, which is consistent with a theory that assumes the presence of localized orphan spins forming random singlets. These results appear to capture an essential feature of the QSL state of 1T-TaS2; localized orphan spins induced by disorder form random valence bonds and are surrounded by a QSL phase with spinon Fermi surface. Electron irradiation in pure 1T-TaS2 largely enhances γ and changes the scaling function dramatically, suggesting a possible new state of spin liquid.

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Absence of Magnetic Thermal Conductivity in the Quantum Spin Liquid Candidate EtMe3Sb[Pd(dmit)2

Cited by 75 publications

References 37 publications

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2
Yamashita
¹
,
Sato
²
,
Tominaga
³

et al. 2020
Phys. Rev. B
Self Cite
27
3
26
0
View full text Add to dashboard Cite

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2
Yamashita
¹
,
Sato
²
,
Tominaga
³

et al. 2020
Phys. Rev. B
Self Cite
27
3
26
0
View full text Add to dashboard Cite

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

Effect of quenched disorder on the quantum spin liquid state of the triangular-lattice antiferromagnet 1T−TaS2

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Absence of Magnetic Thermal Conductivity in the Quantum Spin Liquid Candidate EtMe3Sb[Pd(dmit)2

Cited by 75 publications

References 37 publications

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2Yamashita1, Sato2, Tominaga3 et al. 2020Phys. Rev. BSelf Cite273260View full textAdd to dashboardCite

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2Yamashita1, Sato2, Tominaga3 et al. 2020Phys. Rev. BSelf Cite273260View full textAdd to dashboardCite

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

Effect of quenched disorder on the quantum spin liquid state of the triangular-lattice antiferromagnet 1T−TaS2

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Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2
Yamashita
¹
,
Sato
²
,
Tominaga
³

et al. 2020
Phys. Rev. B
Self Cite
27
3
26
0
View full text Add to dashboard Cite

Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2
Yamashita
¹
,
Sato
²
,
Tominaga
³

et al. 2020
Phys. Rev. B
Self Cite
27
3
26
0
View full text Add to dashboard Cite