Bulk Electronic Structure of Quasicrystals

Nayak, J.; Maniraj, M.; Rai, Abhishek; Singh, Sanjay; Rajput, Parasmani; Gloskovskii, A.; Zegenhagen, J.; Schlagel, Deborah L.; Lograsso, Thomas A.; Horn, Karsten; Barman, Sudipta Roy

doi:10.1103/physrevlett.109.216403

Cited by 28 publications

(28 citation statements)

References 30 publications

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“…[2][3][4][5] There is a growing body of theoretical and experimental evidence that the fundamental reason for the formation of quasicrystalline order is the presence of a pseudogap around the Fermi level. [6][7][8][9][10] However, the electronic contribution to the specific heat in Zn-Mg-Y was reported to be similar to Zn metal, indicating no reduction of the density of states (DOS) at E F , 4 although in the same work a distinct feature that was assigned to an excitation across a pseudogap was observed from optical conductivity study. 4 It was also reported 11 that their resistivity (150-200 µΩ-cm) is an order of magnitude lower than Al-based quasicrystals such as Al-Pd-Mn 12 or highly conducting compositions of Al-Pd-Re, 13 again pointing towards a higher DOS at E F in the former.…”

Section: Introductionmentioning

confidence: 72%

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Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

et al. 2015

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We use bulk sensitive hard x-ray photoelectron spectroscopy to provide unambiguous evidence for a pseudogap in the density of states around the Fermi level in icosahedral Zn-Mg-Y and Zn-Mg-Dy quasicrystals, in agreement with our density functional theory calculations. The pseudogap in these Zn-based quasicrystals is less pronounced compared to the Al-based ones such as Al-Pd-Mn and AlCu-Fe [J. Nayak et al., Phys. Rev. Lett. 109, 216403 (2012)]. This observation is in agreement with transport studies that indicate a larger charge carrier concentration in the Zn-based quasicrystals. Compared to Zn-Mg-Dy, the pseudogap is somewhat deeper in Zn-Mg-Y. The larger width of the Mg 1s and Zn 2p core-level spectra in Zn-Mg-Y is explained by different configurations of the local atomic surrounding compared to Zn-Mg-Dy.

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Section: Introductionmentioning

confidence: 72%

“…We unambiguously establish the existence of a pseudogap, although not as pronounced as Al-based quasicrystals such as Al-Pd-Mn or Al-Cu-Fe. 10 The present work resolves the continuing disagreement between ab initio density functional theory and the results from surface sensitive photoemission spectroscopy. 2,5 …”

Section: Introductionmentioning

confidence: 91%

Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

et al. 2015

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“…However, since IPES is a surface sensitive technique, the pseudogap observed here is weaker compared to the bulk, as shown by our recent hard x-ray photoemission spectroscopy study. 6 …”

Section: Resultsmentioning

confidence: 99%

“…1,2 An increasing body of evidence has supported this notion 3,4 indicating the presence of a pseudogap in the bulk, while the surface may behave differently. 5,6 The bulk electronic structure of quasicrystals recently studied by hard x-ray photoelectron spectroscopy demonstrates presence of a pseudogap. 6 On the other hand, low energy photoemission studies that are surface sensitive, did not reveal a clear signature of the pseudogap.…”

Section: Introductionmentioning

confidence: 99%

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Unoccupied electronic states of icosahedral Al-Pd-Mn quasicrystals: Evidence of image potential resonance and pseudogap

et al. 2014

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We study the unoccupied region of the electronic structure of the fivefold symmetric surface of an icosahedral (i) Al-Pd-Mn quasicrystal. A feature that exhibits parabolic dispersion with an effective mass of (1.15±0.1)me and tracks the change in the work function is assigned to an image potential resonance because our density functional calculation shows absence of band gap in the respective energy region. We show that Sn grows pseudomorphically on i-Al-Pd-Mn as predicted by density functional theory calculations and the energy of the image potential resonance tracks the change in the work function with Sn coverage. The image potential resonance appears much weaker in the spectrum from the related crystalline Al-Pd-Mn surface, demonstrating that its strength is related to the compatibility of the quasiperiodic wave functions in i-Al-Pd-Mn with the free electron like image potential states. Our investigation of the energy region immediately above EF provides unambiguous evidence for the presence of a pseudogap, in agreement with our density functional theory calculations.

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