Low-Temperature Nuclear Magnetic Resonance Studies of an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Al</mml:mi></mml:mrow><mml:mrow><mml:mn>70</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Re</mml:mi></mml:mrow><mml:mrow><mml:mn>8.6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Pd</mml:mi></mml:mrow><mml:mrow><mml:mn>21.4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>I

Gavilano, J. L.; Ambrosini, B.; Vonlanthen, P.; Черников, М. А.; Ott, H. R.

doi:10.1103/physrevlett.79.3058

Cited by 25 publications

(13 citation statements)

References 23 publications

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“…29 The linewidth increases with decreasing temperature. We argue that this signal consists of two partially resolved contributions representing the central transitions of Al nuclei located in either of two distinctly different local environments.…”

Section: B Nmr Spectramentioning

confidence: 98%

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Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1
Rau
¹
,
Gavilano
²
,
Mushkolaj
³

et al. 2003
Phys. Rev. B
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We report the results of measurements of 27 Al and 55 Mn NMR spectra, the related spin-lattice relaxation rates, and the dc magnetic susceptibility of the stable decagonal quasicrystal Al 69.8 Pd 12.1 Mn 18.2 . The temperature variation of the magnetic susceptibility (T) reveals that the Mn ions carry only an effective magnetic moment of approximately 2 B , and confirms a spin-glass-type freezing of the Mn moments at T f ϭ12 K. The NMR spectra reveal two partially resolved lines for the 27 Al-nuclei, indicating that there are two different sets of environments for the Al-sites. The integrated intensity of the Mn line in the spectra suggests that about half of the Mn ions carry no magnetic moment. Below 50 K, and upon decreasing the temperature, the 27 Al NMR linewidth w and the spin-lattice relaxation rate T 1 Ϫ1 both grow with an increasingly negative slope, as it is often observed and interpreted as a critical ''slowing down'' of magnetic moments in systems approaching a spinglass transition. Various features, such as a broad maximum in T 1 Ϫ1 (T) and a slope change in the w() plot, both around 120 K, suggest a gradual reduction of the number of Mn moments with decreasing temperature below 120 K.

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Section: B Nmr Spectramentioning

confidence: 98%

“…The broad distribution of quadrupolar wings is a generic feature of QC's. 29 The vertical dotted line in Fig. 3 indicates the position of the resonance of 27 Al nuclei in an aqueous AlClO 3 solution at room temperature and 24.97 MHz, which is used as a reference signal.…”

Section: B Nmr Spectramentioning

confidence: 99%

Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1
Rau
¹
,
Gavilano
²
,
Mushkolaj
³

et al. 2003
Phys. Rev. B
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7
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0
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“…Icosahedral quasicrystals [2] are representatives o f three-dimensional quasiperiodic structures, which were already investigated by N M R many times [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The attention was prima¡ focused on getting information about (i) local atomic environments through the nuclear electric quadrupolar interaction with the surrounding electric charges; (ii) local electronic and magnetic structure through the magnetic hyperfine electron-nucleus interactions and (iii) excitations, fluctuations and diffusion o f the atoms and electrons in the system through the nuclear spin-lattice and spin-spin relaxations.…”

Section: Introductionmentioning

confidence: 99%

Basics of NMR line shape in quasicrystals

et al. 2004

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Abstraet.The measurement and analysis of broad nuclear magnetic resonance (NMR) spectra of quasicrystals require experimental methods and theoretical interpretations different from NMR investigations of regular periodic crystals. Frequency-and fietd-sweep methods for recording quasicrystalline NMR spectra are described and compared with the measurement of 27AI NMR spectra of icosahedral AIPdMn and decagonal AINiCo quasicrystals. The nuclear spin interactions that determine the NMR line shape are the same for both types of the above Al-based quasicrystals, where the electric quadrupolar interaction with the broad distribution of its electric field gradient parameters predominantly determines the shape of the broad satellite "background" intensity. The essential observations are an almost isotropic 27A1 NMR spectrum of the icosahedral quasicrystals anda strong angular dependence of the spectrum of decagonal quasicrystals.

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“…The possible existence of the critical eigenstates in the i-Al-Pd-Re alloy was invoked in the interpretation of the unusual power-law-like increase of 27 Al-NMR (T 1 T) Ϫ1 with decreasing temperature below 20 K. 52 A common characteristic of the measurements mentioned above is the fact that they probe the DOS indirectly via, sometimes complex, dependencies of the measured parameters upon DOS. Studies using spectroscopic techniques which probe DOS directly in the vicinity of E F are therefore desirable to determine the predicted presence of the pseudogap in the DOS(E F ) and of the DOS fine structure in QC's.…”

Section: Introductionmentioning

confidence: 99%

Absence of fine structure in the photoemission spectrum of the icosahedral Al-Pd-Mn quasicrystal

et al. 2001

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Absence of fine structure in the photoemission spectrum of the icosahedral Al-Pd-Mn quasicrystal AbstractThe results of the low-temperature ultrahigh-energy-resolution photoemission studies of a single-grain icosahedral alloy Al 70 Pd 21.5 Mn 8.5 have been presented. The existence of the theoretically predicted pseudogap in the density of states at the Fermi energy has been confirmed. No evidence of the theoretically predicted spikiness of the density of states could be observed. It has been suggested that the failure to detect the predicted spikiness of the density of states in icosahedral quasicrystals is consistent with the results of Zijlstra and Janssen [Europhys. Lett. 52, 578 (2000)] who showed that the spikiness occurs only in lowerorder periodic approximants to icosahedral quasicrystals, but does not survive in the quasiperiodic limit. Disciplines Condensed Matter Physics | Metallurgy CommentsThis article is from Physical Review B 64 (2001) The results of the low-temperature ultrahigh-energy-resolution photoemission studies of a single-grain icosahedral alloy Al 70 Pd 21.5 Mn 8.5 have been presented. The existence of the theoretically predicted pseudogap in the density of states at the Fermi energy has been confirmed. No evidence of the theoretically predicted spikiness of the density of states could be observed. It has been suggested that the failure to detect the predicted spikiness of the density of states in icosahedral quasicrystals is consistent with the results of Zijlstra and Janssen ͓Europhys. Lett. 52, 578 ͑2000͔͒ who showed that the spikiness occurs only in lower-order periodic approximants to icosahedral quasicrystals, but does not survive in the quasiperiodic limit.

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Low-Temperature Nuclear Magnetic Resonance Studies of anAl70Re8.6Pd21.4I

Cited by 25 publications

References 23 publications

Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1
Rau
¹
,
Gavilano
²
,
Mushkolaj
³

et al. 2003
Phys. Rev. B
Self Cite
14
7
22
0
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Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1
Rau
¹
,
Gavilano
²
,
Mushkolaj
³

et al. 2003
Phys. Rev. B
Self Cite
14
7
22
0
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Basics of NMR line shape in quasicrystals

Absence of fine structure in the photoemission spectrum of the icosahedral Al-Pd-Mn quasicrystal

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Low-Temperature Nuclear Magnetic Resonance Studies of anAl70Re8.6Pd21.4I

Cited by 25 publications

References 23 publications

Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1Rau1, Gavilano2, Mushkolaj3 et al. 2003Phys. Rev. BSelf Cite147220View full textAdd to dashboardCite

Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1Rau1, Gavilano2, Mushkolaj3 et al. 2003Phys. Rev. BSelf Cite147220View full textAdd to dashboardCite

Basics of NMR line shape in quasicrystals

Absence of fine structure in the photoemission spectrum of the icosahedral Al-Pd-Mn quasicrystal

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Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1
Rau
¹
,
Gavilano
²
,
Mushkolaj
³

et al. 2003
Phys. Rev. B
Self Cite
14
7
22
0
View full text Add to dashboard Cite

Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1
Rau
¹
,
Gavilano
²
,
Mushkolaj
³

et al. 2003
Phys. Rev. B
Self Cite
14
7
22
0
View full text Add to dashboard Cite