메뉴 건너뛰기




Volumn 79, Issue 23, 2009, Pages

Anharmonic softening of Raman active phonons in iron-pnictides: Estimating the Fe isotope effect due to anharmonic expansion

Author keywords

[No Author keywords available]

Indexed keywords


EID: 67650085473     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.235103     Document Type: Article
Times cited : (15)

References (36)
  • 6
    • 45249110406 scopus 로고    scopus 로고
    • 10.1103/PhysRevLett.100.237003
    • D. J. Singh and M.-H. Du, Phys. Rev. Lett. 100, 237003 (2008). 10.1103/PhysRevLett.100.237003
    • (2008) Phys. Rev. Lett. , vol.100 , pp. 237003
    • Singh, D.J.1    Du, M.-H.2
  • 14
    • 67650018133 scopus 로고    scopus 로고
    • We performed measurements also on undoped (x=0) crystals of the same materials. Apart from small changes in phonon energies, we found no significant difference in the Raman spectra between doped and undoped samples.
    • We performed measurements also on undoped (x=0) crystals of the same materials. Apart from small changes in phonon energies, we found no significant difference in the Raman spectra between doped and undoped samples.
  • 19
    • 0000783469 scopus 로고
    • 10.1103/PhysRevB.29.2051;
    • J. Menendez and M. Cardona, Phys. Rev. B 29, 2051 (1984) 10.1103/PhysRevB.29.2051
    • (1984) Phys. Rev. B , vol.29 , pp. 2051
    • Menendez, J.1    Cardona, M.2
  • 22
    • 36049057599 scopus 로고
    • 10.1103/PhysRev.148.845
    • P. G. Klemens, Phys. Rev. 148, 845 (1966). 10.1103/PhysRev.148.845
    • (1966) Phys. Rev. , vol.148 , pp. 845
    • Klemens, P.G.1
  • 23
    • 67650038211 scopus 로고    scopus 로고
    • Note that Δ0 (ω) is a quite rapidly varying function of ω and sensitive to the input parameters ωi and γ. Even avoiding any fine tuning of parameters we find that g can vary by up to 50% from the values given above for moderate changes of our model DOS. However, values of g∼100 eV/ 3 are also in line with estimates for GaAs which has a similar local lattice structure;
    • Note that Δ0 (ω) is a quite rapidly varying function of ω and sensitive to the input parameters ωi and γ. Even avoiding any fine tuning of parameters we find that g can vary by up to 50% from the values given above for moderate changes of our model DOS. However, values of g∼100 eV/ 3 are also in line with estimates for GaAs which has a similar local lattice structure;
  • 25
    • 67650043781 scopus 로고    scopus 로고
    • In Ref. emphasis was put on changes at the SDW transition. While our results match that data for the low temperature orthorhombic phase we have no explanation for the behavior above TSDW where the B1g linewidth saturates and the As A1g mode has unexpectedly vanished.
    • In Ref. emphasis was put on changes at the SDW transition. While our results match that data for the low temperature orthorhombic phase we have no explanation for the behavior above TSDW where the B1g linewidth saturates and the As A1g mode has unexpectedly vanished.
  • 26
    • 67650053063 scopus 로고    scopus 로고
    • arXiv:0901.3538 (unpublished).
    • J. Wu and P. Phillips, arXiv:0901.3538 (unpublished).
    • Wu, J.1    Phillips, P.2
  • 27
    • 67650010320 scopus 로고    scopus 로고
    • According to LDA calculations with varying lattice parameters the relative changes in the bandwidth are approximately the same as the relative changes in the lattice parameters;
    • According to LDA calculations with varying lattice parameters the relative changes in the bandwidth are approximately the same as the relative changes in the lattice parameters;
  • 29
    • 67650005653 scopus 로고    scopus 로고
    • The exact calculation of the change in harmonic zero-point fluctuations gives δr2 =2.36× 10-5 2 along the Fe-As bond and δr2 =3.81× 10-5 2 along the nearest neighbor Fe-Fe bond
    • The exact calculation of the change in harmonic zero-point fluctuations gives δr2 =2.36× 10-5 2 along the Fe-As bond and δr2 =3.81× 10-5 2 along the nearest neighbor Fe-Fe bond.
  • 34
    • 67650035916 scopus 로고    scopus 로고
    • The simplest strong-coupling analysis of the SDW order on the other hand in terms of a large on-site interaction U t would have TSDW ∼J= t2 /U, again a tiny but in this case negative isotope effect.
    • The simplest strong-coupling analysis of the SDW order on the other hand in terms of a large on-site interaction U t would have TSDW ∼J= t2 /U, again a tiny but in this case negative isotope effect.
  • 36
    • 67650055487 scopus 로고    scopus 로고
    • P. M. Shirage (private communication)
    • P. M. Shirage (private communication).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.