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

Dooglav, A. V.; Erëmin, M. V.; Sakhratov, Yu. A.; Savinkov, A. V.

doi:10.1134/1.1405895

Cited by 5 publications

(8 citation statements)

References 8 publications

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“…The latter agrees well with an observation of the increase of the NQR linewidth at Cu(2) site (see Ref. 11 ). In addition, the non-mean-field character of the coexistence of superconductivity and s + id-CDW phases has to be taken into account.…”

supporting

confidence: 92%

“…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.…”

mentioning

confidence: 99%

“…5,6 and zero-field muon spin relaxation (µsR) experiments 8 . Moreover, recent investigations using nuclear magnetic resonance (NMR) technique indicate the presence of the internal fluctuating magnetic fields in the superconducting state of layered cuprates [9][10][11] . Most importantly, the observed enhancement of the magnetic moment's intensity at T c 5,6 seems to indicate an intrinsic and a non-trivial relation between the superconducting and the pseudogap phases.…”

mentioning

confidence: 99%

“…For Q = (π, π) the resulting current is manly determined by Eq. (11). Using the equation for the id − CDW order parameters in a mean field approximation (see for details Ref.…”

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confidence: 99%

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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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confidence: 92%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…For Q = (π, π) the resulting current is manly determined by Eq. (11). Using the equation for the id − CDW order parameters in a mean field approximation (see for details Ref.…”

mentioning

confidence: 99%

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Network patterns and strength of orbital currents in layered cuprates

2002

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“…We also add here that interpretations of pseudogap state nature in HTSC and its influence on the superconductivity are manifold, 68 including among others a charge-density wave (CDW) model. 69 According to this approach, the pseudogap transformations of electronic spectra take place due to strong scattering of electrons on CDW.…”

Section: Vi3 Copper Nuclear Spin-lattice Relaxation and Fermi Level D...mentioning

confidence: 99%

Phase transition and anomalous electronic behavior in the layered superconductor CuS probed by NQR

et al. 2009

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R.R. Gainov).Nuclear quadrupole resonance (NQR) on copper nuclei has been applied for studies of the electronic properties of quasi-two-dimensional low-temperature superconductor CuS (covellite) in the temperature region between 1.47 and 290 K. Two NQR signals corresponding to two nonequivalent sites of copper in the structure, Cu(1) and Cu(2), has been found. The temperature dependences of copper quadrupole frequencies, line-widths and spin-lattice relaxation rates, which so far had never been investigated so precisely for this material, altogether demonstrate the structural phase transition near 55 K, which accompanies transformations of electronic spectrum not typical for simple metals. The analysis of NQR results and their comparison with literature data show that the valence of copper ions at both sites is intermediate in character between monovalent and divalent states with the dominant of the former. It has been found that there is a strong hybridization of Cu(1) and Cu(2) conduction bands at low temperatures, indicating that the charge delocalization between these ions takes place even in 2D regime. Based on our data, the occurrence of energy gap, charge fluctuations and charge-density waves, as well as the nature of phase transition in CuS are discussed. It is concluded that some physical properties of CuS are similar to those of high-temperature superconductors (HTSC) in normal state.PACS number(s): 76.60.Gv; 74.70.Ad; 71.28.+d; 91.60.Pn.

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NQRS Data for Ba2Cu3O7Y (Subst. No. 0358)

Chihara¹,

Nakamura²

2010

Landolt-Börnstein - Group III Condensed Matter

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

Cited by 5 publications

References 8 publications

Network patterns and strength of orbital currents in layered cuprates

Network patterns and strength of orbital currents in layered cuprates

Phase transition and anomalous electronic behavior in the layered superconductor CuS probed by NQR

NQRS Data for Ba2Cu3O7Y (Subst. No. 0358)

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