Thermal expansion, thermoelectric power, and XPS study of the nonmetal-metal transition in Ni1-xS1-ySey

Masanori Matoba, Shuichiro Anzai, Atsushi Fujimorit

Research output: Contribution to journalArticle

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Abstract

Magnetic susceptibility x electrical resistivity p, thermoelectric powerS, XPS spectra and hexagonal lattice parameters c and a are measured on the NiAs-type Ni1-xS1-ySey(x≦0.04; y≦1.00). We find the followings (1) the nonmetal-metal transition temperature T t, the phonon-drag coefficient C below Tt and dξ(T>7)/d T decrease and they are suppressed at xc and y c with increase in x and y, respectively. (2) The nearest neighboring S1-ySey(Z)-Z, Ni-Z and Ni-Ni distances just below T t (DZ-Z N, DN1-N1 N, respectively) are depressed with increase in x. DZ-Z N and DN1-N1 N, only slightly depend on y, while D N1-Z N increases with increasing y.(3) No change in the d8L peak (L: hole in the Z network) in the valence band region is observed among Ni1-xS1-ySey and Ni 0 93Te.(4) The Ni 2p3/2d9L core level peak shifts to lower binding energy EB with increasing y, while it hardly changes with x.(5) The EB of S 2s and S 2p core levels decrease with increasing x; the EB of S 2p one decreases with increasing y. From the view point of the charge-transfer model, the pressure and the Ni-vacancy substitution effects on T1 are mainly explained by the increase in the Z(p) band width, and the Se-substitution effect by the decrease in the charge-transfer energy. The Ni-vacancies also introduce extra holes in the Z(p) band.

Original languageEnglish
Pages (from-to)4230-4244
Number of pages15
JournalJournal of the Physical Society of Japan
Volume60
Issue number12
Publication statusPublished - 1991 Dec

Fingerprint

thermal expansion
transition metals
charge transfer
substitutes
drag coefficients
power spectra
lattice parameters
binding energy
transition temperature
bandwidth
valence
magnetic permeability
electrical resistivity
shift
metals
energy

Keywords

  • Charge transfer
  • Electrical resistivity
  • Magnetic susceptibility
  • Ni SSe
  • Nonmetal-metal transition
  • Thermal expansion
  • Thermoelectric power
  • XPS

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Thermal expansion, thermoelectric power, and XPS study of the nonmetal-metal transition in Ni1-xS1-ySey . / Matoba, Masanori; Anzai, Shuichiro; Fujimorit, Atsushi.

In: Journal of the Physical Society of Japan, Vol. 60, No. 12, 12.1991, p. 4230-4244.

Research output: Contribution to journalArticle

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