Phase diagram of YBa2Cu3O7−y at T&lt;T c according to transverse nuclear relaxation data for Cu(2)

Erëmin, M. V.; Sakhratov, Yu. A.; Savinkov, A. V.; Dooglav, A. V.; Mukhamedshin, I. R.; Egorov, A. V.

doi:10.1134/1.1387523

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…[1][2][3] It was argued that the observed anomalies in the pseudogap gap phase are due to the DDW and its competition with the d-wave superconductor ͑DSC͒. Recent elastic neutron scattering, 4 muon-spin resonance (SR), 5 and NMR/NQR ͑nuclear magnetic/quadrupole resonance͒ experiments 6 appear to have found some direct evidence for the existence of DDW order in YBa 2 Cu 3 O 6ϩ␦ by observing the magnetic fields associated with this order parameter-in other words, by measuring the order parameter itself. In this paper, we wish to elucidate the nature of the competition between the DDW and DSC order parameters by explicitly computing the spin-spin and the current-current correlation functions in two space dimensions in the Hartree-Fock approximation.…”

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confidence: 99%

Spin and current correlation functions in thed-density-wave state of the cuprates

et al. 2001

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We calculate the spin-spin and current-current correlation functions in states exhibiting d x 2 Ϫy 2-density wave ͑DDW͒ order, d x 2 Ϫy 2 superconducting order ͑DSC͒, or both types of orders. The spin-spin correlation functions in a state with both DDW and DSC orders and in a state with DDW order alone, respectively, illuminate the resonant peak seen in the superconducting state of the underdoped cuprates and the corresponding feature seen in the pseudogap regime. The current-current correlation function in a state with both DDW and DSC order evinces a superfluid density with doping dependence, which is consistent with that of the underdoped cuprates. These calculations strengthen the identification of the pseudogap with DDW order and of the underdoped cuprates with a state with both DDW and DSC orders.

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Section: Introductionmentioning

confidence: 99%

Spin and current correlation functions in thed-density-wave state of the cuprates

et al. 2001

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“…The line width in sample 2 has a clear maximum at T = 47 K and a minimum at 35 . These features are due to the spinspin relaxation processes, which were discussed in 4 .…”

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“…The parameter U k describes the inhomogeneous state of the superconductor. According to 4 , its value in the crystals under study is comparatively small. The CDWs and orbital currents are decelerated and, in the limit, pinned by the lattice potential and defects, because the quasiparticle energy depends on the phase of order parameter.…”

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Temperature dependence of the Cu(2) NQR line width in YBa2Cu3O7−y

et al. 2001

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Systematic measurements of the 63 Cu(2) NQR line width were performed in underdoped YBa2Cu3O7−y samples over the temperature range 4.2 K < T < 300 K. It was shown that the copper NQR line width monotonically increases upon lowering temperature in the below-critical region, resembling temperature behavior of the superconducting gap. The observed dependence is explained by the fact that the energy of a condensate of sliding charge-current states of the chargedensity-wave type depends on the phase of order parameter. Calculations show that this dependence appears only at T < Tc. Quantitative estimates of the line broadening at T < Tc agree with the measurement results.

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“…A possibility for a staggered orbital current phase formation in layered cuprates has attracted much interest recently [1][2][3][4][5][6][7][8][9][10][11] . Most importantly, it was shown that most of the observed properties referred to a pseudogap phenomenon can be naturally explained in an extended charge density wave (CDW) scenario with a complex order parameter phase formation (shortly s + id-CDW) in underdoped cuprates.…”

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Network patterns and strength of orbital currents in layered cuprates

2002

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In a frame of the $t-J-G$ model we derive the microscopical expression for the circulating orbital currents in layered cuprates using the anomalous correlation functions. In agreement with $\mu$-on spin relaxation ($\mu$SR), nuclear quadrupolar resonance (NQR) and inelastic neutron scattering(INS) experiments in YBa$_2$Cu$_3$O$_{6+x}$ we successfully explain the order of magnitude and the monotonous increase of the {\it internal} magnetic fields resulting from these currents upon cooling. However, the jump in the intensity of the magnetic fields at T$_c$ reported recently seems to indicate a non-mean-field feature in the coexistence of current and superconducting states and the deviation of the extended charge density wave vector instability from its commensurate value {\bf Q}$\approx(\pi,\pi$) in accordance with the reported topology of the Fermi surface

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Phase diagram of YBa2Cu3O7−y at T<T c according to transverse nuclear relaxation data for Cu(2)

Cited by 6 publications

References 16 publications

Spin and current correlation functions in thed-density-wave state of the cuprates

Spin and current correlation functions in thed-density-wave state of the cuprates

Temperature dependence of the Cu(2) NQR line width in YBa2Cu3O7−y

Network patterns and strength of orbital currents in layered cuprates

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