Cu nuclear magnetic resonance of aligned single crystals 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></mml:ma

Pennington, C. H.; Durand, D. J.; Zax, David B.; Slichter, Charles P.; Rice, J. P.; Ginsberg, D. M.

doi:10.1103/physrevb.37.7944

Cited by 111 publications

(31 citation statements)

References 11 publications

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“…This system has an orthorhombic symmetry, yet all the reports using NMR are consistent with η = 0 [8]. The powder samples are mixed in a teflon container with stycast 1260 and placed in a magnetic field of 9T at room temperature for 24 hr.…”

Section: Methodsmentioning

confidence: 99%

Pure nuclear quadrupole resonance determination of the electric field gradient asymmetry for broad lines

Levy

Keren

2004

Journal of Magnetic Resonance

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We present an angle dependent nuclear quadrupole resonance (ADNQR) method to determine the electric field gradient asymmetry parameter η in systems where the resonance line is so broad that the radio frequency field can excite only a portion of the nuclear spins. In this situation the recently developed spectroscopic methods are not applicable. ADNQR is useful for single crystals and oriented powders, and, for small η determines η 4 . Therefore, it can be used to evaluate fluctuations in η due to inhomogeneities. We demonstrate the application of ADNQR experimentally to oriented superconducting YBa2Cu3O7 powder.

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Section: Methodsmentioning

confidence: 99%

Pure nuclear quadrupole resonance determination of the electric field gradient asymmetry for broad lines

Levy

Keren

2004

Journal of Magnetic Resonance

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“…A more detailed picture was discussed in particular based on data from YBa 2 Cu 3 O 6+y aligned powders and single crystals [5,6,35,42,43].…”

Section: Early Shift Phenomenologymentioning

confidence: 99%

“…Soon after the discovery of cuprate high-temperature superconductors [1], the search for the understanding of their chemical and electronic properties with nuclear magnetic resonance (NMR) began, see e.g., [2][3][4][5][6]. NMR is a powerful local probe that measures the electron-nucleus interaction at particular nuclear sites through its effect on the nuclear levels.…”

Section: Introductionmentioning

confidence: 99%

Contrasting Phenomenology of NMR Shifts in Cuprate Superconductors

2017

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Nuclear magnetic resonance (NMR) shifts, if stripped of their uncertainties, must hold key information about the electronic fluid in the cuprates. The early shift interpretation that favored a single-fluid scenario will be reviewed, as well as recent experiments that reported its failure. Thereafter, based on literature shift data for planar Cu, a contrasting shift phenomenology for cuprate superconductors is developed, which is very different from the early view while being in agreement with all published data. For example, it will be shown that the hyperfine scenario used up to now is inadequate as a large isotropic shift component is discovered. Furthermore, the changes of the temperature dependences of the shifts above and below the superconducting transitions temperature proceed according to a few rules that were not discussed before. It appears that there can be substantial spin shift at the lowest temperature if the magnetic field is perpendicular to the CuO 2 plane, which points to a localization of spin in the 3d(x 2 − y 2 ) orbital. A simple model is presented based on the most fundamental findings. The analysis must have new consequences for theory of the cuprates.

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“…In the fully oxygenated compound (x= 7) the Cu(1) sites have an NQR resonance frequency of 22.2 MHz and 1' \ "" I, while the Cu(2) sites resonate at 31.2 MHz and have 1' \ "" O. Whenxdecreases below 7,the structural and electronic environments of both Cu (1) and Cu (2) are strongly influenced by the oxygen chemistry and thus give rise to a large number of NQR signals. The x dependence of these resonance frequencies and their relaxation behavior is well documented.P'"" and the asymmetry parameters of some but not all of the corresponding quadrupole tensors have also been determined.P" This paper deals with two structure-related aspects of the 63CU NQR peaks.…”

Section: Introductionmentioning

confidence: 98%

“…In the cases where the peaks could successfully be identified this was often based on the knowledge of the crystallographic site symmetry, which could be derived from the symmetry of the nuclear quadrupole coupling tensor. [1][2][3][4][5][6][7][8] The quadrupole asymmetry parameter, 1'\, van-ishes when the site has local axial symmetry, while deviations from axial symmetry are reflected in 1' \ values between 0 and I.…”

Section: Introductionmentioning

confidence: 99%

⁶³Cu NQR Nutation Spectroscopy and Spin Counting in Copper Oxides

Vega

1992

Israel Journal of Chemistry

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Abstract. Nutation spectroscopy of 63CU nuclei at zero static magnetic field is explored as a method for the determination of the quadrupole asymmetry parameters T] of Cu sites in copper oxides, with special emphasis on high-T c superconductors. Since the nutation spectrareveal the actual radio frequency (rt) intensities experienced by the 63CU nuclei, the method also provides a verification of a quantitative Cu spin counting procedure based on integration of nuclear quadrupole resonance (NQR) echo-signal intensities over wide frequency ranges. The paper presents numerical simulations of spectra and signal intensities that were obtained with a density-matrix formalism whereby the spin dynamics is described as precessions in a 3D operator space. The quantitative effects of the echo refocusing pulse, rf amplitude fluctuations, and variations in T] are examined. Examples of 63CU NQR nutation spectra are shown for randomly oriented powders ofCu 2 0 and YBa 2Cu3 0 7 .

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Cu nuclear magnetic resonance of aligned single crystals ofYBa2Cu3

Cited by 111 publications

References 11 publications

Pure nuclear quadrupole resonance determination of the electric field gradient asymmetry for broad lines

Pure nuclear quadrupole resonance determination of the electric field gradient asymmetry for broad lines

Contrasting Phenomenology of NMR Shifts in Cuprate Superconductors

⁶³Cu NQR Nutation Spectroscopy and Spin Counting in Copper Oxides

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Cu nuclear magnetic resonance of aligned single crystals ofYBa2Cu3

Cited by 111 publications

References 11 publications

Pure nuclear quadrupole resonance determination of the electric field gradient asymmetry for broad lines

Pure nuclear quadrupole resonance determination of the electric field gradient asymmetry for broad lines

Contrasting Phenomenology of NMR Shifts in Cuprate Superconductors

63Cu NQR Nutation Spectroscopy and Spin Counting in Copper Oxides

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Product

Resources

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⁶³Cu NQR Nutation Spectroscopy and Spin Counting in Copper Oxides