Phenomenological model of nuclear relaxation in the normal state of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow>

Millis, A. J.; Monien, H.; Pines, David

doi:10.1103/physrevb.42.167

Cited by 1,047 publications

(683 citation statements)

References 18 publications

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“…27,28 It has been argued that the large enhancement of the measured 1 / T 1 T in cuprates is associated with the growth of antiferromagnetic spin fluctuation within the CuO 2 planes as the temperature is lowered. 29,30 The large decrease observed in 1 / T 1 T and K s measurements for underdoped cuprates 27 at temperatures well above T c is suggestive of a depletion of the density of states ͑DOS͒ at the Fermi level which might be expected if a pseudogap opens at T NMR .…”

Section: Introductionmentioning

confidence: 99%

“…͑1b͔͒ and therefore may be sensitive to the details of LW ͑ ͒. Below we follow MMP, 30 and explicitly assume that the uniform susceptibility ͑ 0 ͒ and the spinfluctuation energy near q = 0 ͑⌫͒ are temperature independent. One justification for this approximation in organics is that the Knight shift is not strongly temperature dependent.…”

Section: ͑4͒mentioning

confidence: 99%

“…Their temperature dependence comes through the antiferromagnetic correlation length. We adopt the form of ͑T͒ from M-MMP: 29,30 ͑T͒ / ͑T x ͒ = ͱ2T x / ͑T + T x ͒. For this form of the correlation length, T x represents a characteristic temperature scale of the spin fluctuations and ͑T͒ is only weakly temperature dependent for T T x .…”

Section: Spin Fluctuations In -"Et… 2 Xmentioning

confidence: 99%

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

2007

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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.

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Section: Introductionmentioning

confidence: 99%

Section: ͑4͒mentioning

confidence: 99%

Section: Spin Fluctuations In -"Et… 2 Xmentioning

confidence: 99%

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

2007

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“…Most physicists have thus turned their minds towards an alternative pairing interaction of purely electronic origin (e.g., see Ref. [5][6][7]). As a matter of fact, the idea that the highest T c is only 30 K within the conventional phonon-mediated mechanism is not justified.…”

Section: Introductionmentioning

confidence: 99%

Unconventional isotope effects in the high-temperature cuprate superconductors

Zhao

Keller

Conder

2001

J. Phys.: Condens. Matter

139

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We review various isotope effects in the high-Tc cuprate superconductors to assess the role of the electron-phonon interaction in the basic physics of these materials. Of particular interest are the unconventional isotope effects on the supercarrier mass, on the charge-stripe formation temperature, on the pseudogap formation temperature, on the EPR linewidth, on the spin-glass freezing temperature, and on the antiferromagnetic ordering temperature. The observed unconventional isotope effects strongly suggest that lattice vibrations play an important role in the microscopic pairing mechanism of high-temperature superconductivity.

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“…This time has been measured in YBa 2 Cu 3 O 7 and is in reasonable quantitative agreement with simple phenomenological theories. 16,17 In the special bilayer system discussed above it is possible to excite a spin in one plane and measure the response in the other plane. Then one can use Eq.…”

Section: Interplane Relaxationmentioning

confidence: 99%

Interplane relaxation and the bilayer coupling in Y2Ba4Cu7O15

Monien

Sandvik

1995

J Low Temp Phys

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The origin of the spin gap in the underdoped cuprate superconductors is still mysterious. Experimental evidence from neutron scattering and NMR experiments indicates that the spin gap might be present only in the bilayer compounds. A naive calculation for a two plane Heisenberg model locates the order-disorder transition only for very large exchange coupling between the bilayers. We propose a interplane relaxation experiment which might quantitatively estimate the strength of the bilayer coupling. We make detailed predictions for the size and the temperature dependence of the interplane relaxation rate.

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Phenomenological model of nuclear relaxation in the normal state ofYBa2Cu3

Cited by 1,047 publications

References 18 publications

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

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

Unconventional isotope effects in the high-temperature cuprate superconductors

Interplane relaxation and the bilayer coupling in Y2Ba4Cu7O15

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