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Volumn 81, Issue 18, 2010, Pages

Density of phonon states in superconducting FeSe as a function of temperature and pressure

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EID: 77955474902     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.81.184510     Document Type: Article
Times cited : (39)

References (53)
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    • We name well-resolved maxima in the present DOS g (E) [or in the reduced form, g (E) / E2] "modes." They originate from the flat parts of the dispersion curves mainly around the Brillouin-zone boundaries. For optical modes, the maxima in our phonon-DOS fit well with Raman/IR modes measured at the Γ boundary.
    • We name well-resolved maxima in the present DOS g (E) [or in the reduced form, g (E) / E 2] "modes." They originate from the flat parts of the dispersion curves mainly around the Brillouin-zone boundaries. For optical modes, the maxima in our phonon-DOS fit well with Raman/IR modes measured at the Γ boundary.
  • 36
    • 77955505574 scopus 로고    scopus 로고
    • Optical modes in Fig. are described by a Voigt line profile, consisting of a (fixed) Lorentzian (for the experimental resolution), folded with a Gaussian line profile with a linewidth reflecting the energy range of the dispersion of the optical modes. Details will be given in a forthcoming publication (Ref.).
    • Optical modes in Fig. are described by a Voigt line profile, consisting of a (fixed) Lorentzian (for the experimental resolution), folded with a Gaussian line profile with a linewidth reflecting the energy range of the dispersion of the optical modes. Details will be given in a forthcoming publication (Ref.).
  • 39
    • 77955505385 scopus 로고    scopus 로고
    • There may exist subtle differences in energy of Raman and other modes measured on samples with natural Fe (m=55.85 ) in comparison to the present F 57 e -NIS studies performed on F 57 e -enriched samples. These differences are not decisive for the present study and will be discussed elsewhere (Ref.).
    • There may exist subtle differences in energy of Raman and other modes measured on samples with natural Fe (m = 55.85) in comparison to the present F 57 e -NIS studies performed on F 57 e -enriched samples. These differences are not decisive for the present study and will be discussed elsewhere (Ref.).
  • 40
    • 77955500132 scopus 로고    scopus 로고
    • The position of the unresolved A1g (Se) and B1g (Fe) Raman modes in the neutron spectra at ∼25 meV can be explained as the average of 25.5 meV for the Fe B1g mode (present data) and ∼24 meV for the A1g (Se) mode according to the Fe/Se mass difference and their spectral contributions shown in the neutron study (Ref.).
    • The position of the unresolved A 1 g (Se) and B 1 g (Fe) Raman modes in the neutron spectra at ∼ 25 meV can be explained as the average of 25.5 meV for the Fe B 1 g mode (present data) and ∼ 24 meV for the A 1 g (Se) mode according to the Fe/Se mass difference and their spectral contributions shown in the neutron study (Ref.).
  • 42
    • 77955486601 scopus 로고    scopus 로고
    • The observed 4% decrease in mode energies from 296 to 10 K is directly connected with the thermal contraction of the volume of the unit cell by ∼1% (Refs.). With the data of the Grüneisen parameters of the Fe modes given in Table , only slightly more than one quarter of the observed shifts can be attributed to the volume contraction. The other three quarters are due to the increasing anharmonicity of the vibrational modes with increasing temperature (Ref.). Since these temperature effects are not considered in the theoretical calculations, we compare here our data obtained at 10 K with the theoretical data in Refs..
    • The observed 4% decrease in mode energies from 296 to 10 K is directly connected with the thermal contraction of the volume of the unit cell by ∼ 1 % (Refs.). With the data of the Grüneisen parameters of the Fe modes given in Table, only slightly more than one quarter of the observed shifts can be attributed to the volume contraction. The other three quarters are due to the increasing anharmonicity of the vibrational modes with increasing temperature (Ref.). Since these temperature effects are not considered in the theoretical calculations, we compare here our data obtained at 10 K with the theoretical data in Refs..
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.