High-resolution angle-resolved photoemission study of Ni(1 1 1) surface state

Higashiguchi, M.; Shimada, Kenya; Arita, Masashi; Miura, Y.; Tobita, N.; Cui, Xiaoyu; Aiura, Y.; Namatame, H.; Takeuchi, Masaki

doi:10.1016/j.susc.2007.04.136

Cited by 14 publications

(19 citation statements)

References 14 publications

(27 reference statements)

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“…12 Recently, we have done high-resolution angleresolved photoemission spectroscopy ͑HR-ARPES͒ measurements at 10 K using synchrotron radiation. 18 Our HR-ARPES measurement has confirmed the existence of the majority-spin Shockley SS below E F . However, taken at low temperature, the energy for the bottom of the parabolic band ͑−135 meV͒ is slightly lower than the value determined previously ͑−110 meV͒ at 140-155 K. 13 The result indicates that the energy shift toward the lower binding energy on heating also occurs in Ni͑111͒ as observed for the Shockley SSs in noble metals.…”

Section: Introductionsupporting

confidence: 63%

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Surface electronic structures of ferromagnetic Ni(111) studied by STM and angle-resolved photoemission

et al. 2009

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Spin-polarized surface electronic states in Ni͑111͒ have been examined using scanning tunneling microscopy ͑STM͒ and spectroscopy ͑STS͒ combined with high-resolution angle-resolved photoemission spectroscopy ͑HR-ARPES͒. Standing waves derived from the majority-spin Shockley surface state ͑SS͒ have been observed in the STM and dI / dV images. The fast Fourier transform ͑FFT͒-dI / dV image at a different sample bias exhibited a circular contour in the reciprocal space. The radius of the FFT-dI / dV image was in agreement with that of the corresponding constant-energy contour given by the HR-ARPES. The majority-spin Shockley SS is partially occupied and disperses upward, crossing the Fermi level ͑E F ͒ at a wave number of k F = 0.081Ϯ 0.005 Å −1 . The effective mass ͑m ‫ء‬ ͒ with respect to the free-electron mass ͑m e ͒ of the majority-spin Shockley SS was evaluated to be m ‫ء‬ / m e = 0.19Ϯ 0.03. The STS spectrum indicated a pair of the Shockley SS below and above E F with an exchange splitting of ϳ190 meV. By the line-shape analyses of the HR-ARPES spectrum, the lifetime broadening at the ⌫ point was calculated to be 53.6 meV, which agrees well with the width ͑49 meV͒ of the steplike structure in the STS spectrum. The results from the STM/STS and HR-ARPES experiments were found to be mutually consistent.

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Section: Introductionsupporting

confidence: 63%

“…[10][11][12][13][14][15][16][17][18] The exchange-split Shockley surface states were first predicted by a one-step model photoemission calculation. 11 More recent theoretical works have also predicted two SSs, which are separated by 180-350 meV.…”

Section: Introductionmentioning

confidence: 99%

Surface electronic structures of ferromagnetic Ni(111) studied by STM and angle-resolved photoemission

et al. 2009

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“…Though, this splitting was not present everywhere on the surface, and its Fermi vectors did not correspond to the previous inverse photoemission [3] nor photoemission experiments [5]. Also, spin integrated state of the art high resolution photoemission [6] and corresponding scanning probe experiments did not resolve this issue [7]. In particular it could not be decided whether the surface states are exchange split or not.…”

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confidence: 79%

Exchange splitting of the threeΓ¯surface states of Ni(111) from three-dimensional spin- and angle-resolved photoemission spectroscopy

et al. 2009

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The valence-band electronic structure of a clean Ni(111) surface is investigated by spin-resolved photoemission. At room temperature the orientation of the photoelectron spins on the Bloch sphere and the exchange splitting of surface and bulk states along the surface normal (Γ̅ ) are determined. All investigated states are found to have a sizable exchange splitting >50 meV. Since the splitting is smaller than the intrinsic line width in the spin-integrated spectrum this is only seen with a spin-resolved technique. At room-temperature photoemission reaching above the Fermi level directly shows that the Shockley type surface state S1 has an occupied majority and an unoccupied minority band with a splitting ΔEex=62±15 meV. AbstractThe valence band electronic structure of a clean Ni(111) surface is investigated by spin-resolved

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“…The electronic properties of the constituent parts, the (111) surface of the 3d band ferromagnet nickel [2][3][4][5][6][7][8] and the chemically inert insulator boron nitride (BN) [9][10][11] have already been thoroughly explored. h-BN/Ni(111) was further employed as a substrate for the investigation of C 60 molecules, because the h-BN layer electronically decouples the molecules from the substrate.…”

Section: Introductionmentioning

confidence: 99%