Suppression of inhomogeneous electron localization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>κ</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BEDT</mml:mi><mml:mtext>−</mml:mtext><mml:mi>TTF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvar

Kawamoto, Atsushi; Honma, Yasushi; Kumagai, K.; Matsunaga, N.; Nomura, K.

doi:10.1103/physrevb.74.212508

Cited by 25 publications

(37 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We are specifically interested in the 13 C NMR measurements of the Knight shifts, 3,4,5 and what we can learn from these for the material and the spin liquid. The measurements effectively give a histogram of local magnetic susceptibility and are therefore a good probe of the magnetic properties.…”

Section: 910mentioning

confidence: 99%

“…There are quite possibly additional sources of disorder such as different local environments coming from different conformations of the ET molecules, 16,17,18,19 or from disorder in the insulating anion layers such as the disordered (CN) − group. 5,20,21,22 Analyzing the NMR ex-periments can then provide some understanding of the disorder, its strength, and role in the insulator phase. Taking up the Mott insulator picture as one viable candidate, where the insulator is primarily driven by electronelectron interactions, we set out to study models of nonmagnetic disorder in a spin-1/2 system on the triangular lattice.…”

Section: 910mentioning

confidence: 99%

“…1,2,3,4,5,6 It contains ET molecules that pair up, each pair lies on sites of triangular lattice and has one electron less then the full filling. The material at ambient pressure is an insulator.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofC
Gregor¹,
Motrunich²
2009
Phys. Rev. B
17
1
14
0
View full text Add to dashboard Cite

We study effects of nonmagnetic impurities in a spin-1/2 frustrated triangular antiferromagnet with the aim of understanding the observed broadening of 13 C NMR lines in the organic spin liquid material κ-(ET)2Cu2(CN)3. For high temperatures down to J/3, we calculate local susceptibility near a nonmagnetic impurity and near a grain boundary for the nearest neighbor Heisenberg model in high temperature series expansion. We find that the local susceptibility decays to the uniform one in few lattice spacings, and for a low density of impurities we would not be able to explain the line broadening present in the experiments already at elevated temperatures. At low temperatures, we assume a gapless spin liquid with a Fermi surface of spinons. We calculate the local susceptibility in the mean field and also go beyond the mean field by Gutzwiller projection. The zero temperature local susceptibility decays as a power law and oscillates at 2kF . As in the high temperature analysis we find that a low density of impurities is not able to explain the observed broadening of the lines. We are thus led to conclude that there is more disorder in the system. We find that a large density of point-like disorder gives broadening that is consistent with the experiment down to about 5K, but that below this temperature additional mechanism is likely needed.

show abstract

Section: 910mentioning

confidence: 99%

Section: 910mentioning

confidence: 99%

See 1 more Smart Citation

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofC
Gregor¹,
Motrunich²
2009
Phys. Rev. B
17
1
14
0
View full text Add to dashboard Cite

show abstract

“…One motivation comes from experiments on the 2D spin liquid materials -͑ET͒ 2 Cu 2 ͑CN͒ 3 and EtMe 3 Sb͓Pd͑dmit͒ 2 ͔ 2 measuring thermodynamic, transport, and local magnetic properties under strong fields. 1,3,5,[17][18][19] An important question is whether the field can induce changes in the physical state of the system.…”

Section: Introductionmentioning

confidence: 99%

Effects of Zeeman field on a spin Bose-metal phase

Lai

Motrunich

2010

Phys. Rev. B

View full text Add to dashboard Cite

We consider Zeeman field effects on a spin Bose-metal ͑SBM͒ phase on a two-leg triangular ladder. This phase was found in a spin-1/2 model with ring exchanges ͓D. N. Sheng, O. I. Motrunich, and M. P. A. Fisher, Phys. Rev. B 79, 205112 ͑2009͔͒ and was also proposed to appear in an interacting electronic model with longer-ranged repulsion ͓H.-H. Lai and O. I. Motrunich, Phys. Rev. B 81, 045105 ͑2010͔͒. Using bosonization of a spinon-gauge theory, we study the stability of the SBM phase and its properties under the field. We also explore phases arising from potential instabilities of the SBM; in all cases, we find a gap to spin-1 excitations while spin-nematic correlations are power law. We discuss two-dimensional analogues of these phases where spinons can pair with their own species.

show abstract

“…The present work is motivated by 13 C NMR experiments [9][10][11][12] in the organic spin-liquid material that observed strong inhomogeneous line broadening at low temperatures. Theoretical Ref.…”

Section: Introductionmentioning

confidence: 99%

Effects of impurities in spin Bose-metal phase on a two-leg triangular strip

Lai

Motrunich

2009

Phys. Rev. B

View full text Add to dashboard Cite

We study the effects of nonmagnetic impurities in a spin Bose-metal ͑SBM͒ phase discovered in a two-leg triangular strip spin-1/2 model with ring exchanges ͑D. N. Sheng et al., arXiv:0902.4210͒. This phase is a quasi-one-dimensional ͑quasi-1D͒ descendant of a two-dimensional ͑2D͒ spin liquid with spinon Fermi sea and the present study aims at interpolating between the 1D and 2D cases. Different types of defects can be treated as local-energy perturbations, which we find are always relevant. As a result, a nonmagnetic impurity generically cuts the system into two decoupled parts. We calculate bond energy and local spin susceptibility near the defect, both of which can be measured in experiments. The spin Bose metal has dominant correlations at characteristic incommensurate wave vectors that are revealed near the defect. Thus, the bond energy shows a static texture oscillating as a function of distance from the defect and decaying as a slow power law. The local spin susceptibility also oscillates and actually increases as a function of distance from the defect, similar to the effect found in the 1D chain ͓S. Eggert and I. Affleck, Phys. Rev. Lett. 75, 934 ͑1995͔͒. We calculate the corresponding power-law exponents for the textures as a function of one Luttinger parameter of the SBM theory.

show abstract

Suppression of inhomogeneous electron localization inκ−(BEDT−TTF)2Cu2(C

Cited by 25 publications

References 17 publications

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofC
Gregor¹,
Motrunich²
2009
Phys. Rev. B
17
1
14
0
View full text Add to dashboard Cite

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofC
Gregor¹,
Motrunich²
2009
Phys. Rev. B
17
1
14
0
View full text Add to dashboard Cite

Effects of Zeeman field on a spin Bose-metal phase

Effects of impurities in spin Bose-metal phase on a two-leg triangular strip

Contact Info

Product

Resources

About

Suppression of inhomogeneous electron localization inκ−(BEDT−TTF)2Cu2(C

Cited by 25 publications

References 17 publications

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofCGregor1, Motrunich2 2009Phys. Rev. B171140View full textAdd to dashboardCite

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofCGregor1, Motrunich2 2009Phys. Rev. B171140View full textAdd to dashboardCite

Effects of Zeeman field on a spin Bose-metal phase

Effects of impurities in spin Bose-metal phase on a two-leg triangular strip

Contact Info

Product

Resources

About

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofC
Gregor¹,
Motrunich²
2009
Phys. Rev. B
17
1
14
0
View full text Add to dashboard Cite

Nonmagnetic impurities in aS=12frustrated triangular antiferromagnet: Broadening ofC
Gregor¹,
Motrunich²
2009
Phys. Rev. B
17
1
14
0
View full text Add to dashboard Cite