Mott Transition and Transport Crossovers in the Organic Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mo stretchy="false">(</mml:mo><mml:mi mathvariant="normal">B</mml:mi><mml:mi mathvariant="normal">E</mml:mi><mml:mi mathvariant="normal">D</mml:mi><mml:mi mathvariant="normal">T</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi mathvariant="normal">T</mml:mi><mml:mi mathvariant="normal">T</mml

Limelette, P.; Wzietek, P.; Florens, Serge; Georges, Antoine; Costi, T. A.; Pasquier, Claude; Jérôme, D.; Meźière, Cécile; Batail, Patrick

doi:10.1103/physrevlett.91.016401

Cited by 262 publications

(340 citation statements)

References 13 publications

(24 reference statements)

Supporting

Mentioning

299

Contrasting

Unclassified

Order By: Relevance

“…This is due to the sharp crossover between the Fermi liquid fixed point and the local moment fixed point in the strongly correlated regime. A similar nonmonotonic temperature dependence is seen in the electrical resistivity from DMFT calculations and in organic charge-transfer salts close to the Mott insulator [5,23,34].…”

Section: High-temperature Behaviorsupporting

confidence: 50%

“…Furthermore, DMFT has also been found to provide quantitative description of the resistivity [34] and the frequency-dependent optical conductivity [35] for organic charge-transfer salts that can be described by a half-filled two-dimensional Hubbard model on an anisotropic triangular lattice [36]. DMFT combined with electronic-structure calculations based on density functional theory (DFT) has given an excellent description of a large class of transition-metal and rare-earth compounds [37].…”

Section: Dynamical Mean-field Theorymentioning

confidence: 99%

See 1 more Smart Citation

Shear viscosity of strongly interacting fermionic quantum fluids

Pakhira

McKenzie

2015

Phys. Rev. B

View full text Add to dashboard Cite

Eighty years ago, Eyring proposed that the shear viscosity of a liquid η has a quantum limit η n where n is the density of the fluid. Using holographic duality and the anti-de Sitter/conformal field theory correspondence in string theory, Kovtun, Son, and Starinets (KSS) conjectured a universal bound η s 4πk B for the ratio between the shear viscosity and the entropy density s. Using dynamical mean-field theory, we calculate the shear viscosity and entropy density for a fermionic fluid described by a single-band Hubbard model at half-filling. Our calculated shear viscosity as a function of temperature is compared with experimental data for liquid 3 He. At low temperature, the shear viscosity is found to be well above the quantum limit and is proportional to the characteristic Fermi liquid 1/T 2 dependence, where T is the temperature. With increasing temperature and interaction strength U , there is significant deviation from the Fermi liquid form. Also, the shear viscosity violates the quantum limit near the crossover from coherent quasiparticle-based transport to incoherent transport (the bad metal regime). Finally, the ratio of the shear viscosity to the entropy density is found to be comparable to the KSS bound for parameters appropriate to liquid 3 He. However, this bound is found to be strongly violated in the bad metal regime for parameters appropriate to lattice electronic systems such as organic charge-transfer salts.

show abstract

Section: High-temperature Behaviorsupporting

confidence: 50%

Section: Dynamical Mean-field Theorymentioning

confidence: 99%

Shear viscosity of strongly interacting fermionic quantum fluids

Pakhira

McKenzie

2015

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…8,[15][16][17]47 This suggests that these systems undergo a crossover from a bad metal regime for T Ͼ T 0 to a renormalized Fermi liquid below T 0 . However, we will show below ͑also see Fig.…”

Section: ͑13͔͒mentioning

confidence: 99%

“…Many features of the metallic phase agree well with the predictions of dynamical meanfield theory ͑DMFT͒ 14 which describes the crossover from a "bad metal" at high temperatures to a Fermi liquid as the temperature is lowered. [15][16][17] This crossover from incoherent to coherent intralayer 18 transport has been observed in a number of experiments such as resistivity, 17 thermopower, 15,19 and ultrasonic attenuation. 20,21 The existence of coherent quasiparticles is also apparent from the observed magnetic quantum oscillations at low temperatures in -͑ET͒ 2 X.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic spin fluctuations in the metallic phase of quasi-two-dimensional organic superconductors

2007

View full text Add to dashboard Cite

We give a quantitative analysis of the previously published nuclear magnetic resonance ͑NMR͒ experiments in the -͑ET͒ 2 X family of organic charge-transfer salts. The temperature dependence of the nuclear-spin relaxation rate 1 / T 1 , the Knight shift K s , and the Korringa ratio K is compared to the predictions of the phenomenological spin-fluctuation model of Moriya and Millis, Monien, and Pines ͑M-MMP͒, that has been used extensively to quantify antiferromagnetic spin fluctuations in the cuprates. For temperatures above T NMR Ӎ 50 K, the model gives a good quantitative description of the data in the metallic phases of several -͑ET͒ 2 X materials. These materials display antiferromagnetic correlation lengths which increase with decreasing temperature and grow to several lattice constants by T NMR . It is shown that the fact that the dimensionless Korringa ratio is much larger than unity is inconsistent with a broad class of theoretical models ͑such as dynamical mean-field theory͒ which neglects spatial correlations and/or vertex corrections. For materials close to the Mott insulating phase the nuclear-spin relaxation rate, the Knight shift, and the Korringa ratio all decrease significantly with decreasing temperature below T NMR . This cannot be described by the M-MMP model and the most natural explanation is that a pseudogap, similar to that observed in the underdoped cuprate superconductors, opens up in the density of states below T NMR . Such a pseudogap has recently been predicted to occur in the dimerized organic charge-transfer salts materials by the resonating valence bond ͑RVB͒ theory. We propose specific experiments on organic superconductors to elucidate these issues. For example, measurements to see if high magnetic fields or high pressures can be used to close the pseudogap would be extremely valuable.

show abstract

“…Since the organic materials are relatively softer than transition metal oxides, structural modifications and/or electronic phase transitions appear under low or moderate pressures. For example, κ-(BEDT-TTF) 2 Recently, we have successfully developed a pumpprobe measurement system under high-pressure and low temperature with a piston-cylinder type pressure cell and an optical fiber bundle [?]. This pressure cell can allow us to perform the systematic study easily with varying pressure for organic superconductors as compared to a diamond anvil cell.…”

Section: Introductionmentioning

confidence: 99%

Carrier Relaxation Dynamics in the Organic Superconductor κ-(BEDT-TTF)2Cu(NCS)2 Under Pressure

Tsuchiya

Nakagawa

Yamada³

et al. 2016

J Supercond Nov Magn

View full text Add to dashboard Cite

Photo-induced carrier relaxation dynamics have been investigated for the organic superconductor κ-(BEDT-TTF) 2 Cu(NCS) 2 with different probe polarization under 1.3 kbar at low temperatures. We successfully observed the isotropic and anisotropic responses for the probe polarization, which were found to appear at 56 K. By comparing the responses with and without applying pressure, we found that those were slightly changed, indicating that the application of pressure has an effect on the carrier relaxation dynamics.

show abstract

Mott Transition and Transport Crossovers in the Organic Compoundκ−(BEDT−TT

Cited by 262 publications

References 13 publications

Shear viscosity of strongly interacting fermionic quantum fluids

Shear viscosity of strongly interacting fermionic quantum fluids

Antiferromagnetic spin fluctuations in the metallic phase of quasi-two-dimensional organic superconductors

Carrier Relaxation Dynamics in the Organic Superconductor κ-(BEDT-TTF)2Cu(NCS)2 Under Pressure

Contact Info

Product

Resources

About