Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Superconducting Properties and Tunneling Spectroscopy of Bi2Sr2Ca(Cu1-xNix)2O8+δ Film by LPE Method

LPE법으로 성장시킨 Bi2Sr2Ca(Cu1-xNix)2O8+δ 막(film)의 초전도특성 및 터널링 분광

  • 이민수 (한밭대학교 환경보전방재연구소)
  • Published : 2003.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

Tunneling spectra of B $i_2$S $r_2$Ca(C $u_{1-x}$ N $i_{x}$ )$_2$ $O_{8+}$$\delta$/ film by LPE method have been measured using break junctions. The energy gap 2$\Delta$ and 2$\Delta$/ $k_{B}$ $T_{c}$ $^{zero}$ increased with increase of ft. We obtained the energy gap Parameter 2$\Delta$(4.2 K) = 54.4~64 meV, and corresponding1y $\Delta$/ $k_{B}$ $T_{c}$ $^{zero}$=7.36~10.14, larger than the BCS value. The lattice constant c and critical temperature $T_{c}$ $^{zero}$ decrease with increase of $\chi$$_{L}$.

LPE(Liquid Phase Epitaxial)법을 이용하여 성장시킨 B $i_2$S $r_2$Ca(C $u_{1-x}$ N $i_{x}$ )$_2$ $O_{8+}$$\delta$/ 막(film)을 break junction 법을 이용하여 터널링 분광을 측정하였다. Ni 조성비 $\chi$$_{L}$의 증가에 따라 에너지 간격 2$\Delta$의 크기는 증가하였다. 에너지 간격 2$\Delta$(4.2 K)는 54.4~64 meV, 2$\Delta$/ $k_{B}$ $T_{c}$ $^{zero}$는 7.36~10.14로 BCS 이론에 의한 값 보다 큰 결과를 얻었다. 융액(melting solution) 속의 Ni 조성비 $\chi$$_{L}$의 증가에 따라, 임계온도 $T_{c}$ $^{zero}$와 격자상수 c-축의 길이는 감소하는 경향을 보였다.을 보였다.$^{zero}$와 격자상수 c-축의 길이는 감소하는 경향을 보였다.

Keywords

References

  1. Z. Phys. B v.64 no.2 Possible High $T_{c}$ Superconductivity in the Ba-La-Cu-O System J.G.Bednorz;K.A.Muller https://doi.org/10.1007/BF01303701
  2. Phys. Rev. B v.37 Evidence for Holes on Oxygen Sites in the High-$T_{c}$ Superconductors $La_{2-x}$SrCuO₄and YBa₂Cu₃$O_{7-y}$ N.Nucker;J.C.Fuggle;P.J.Durham;W.M.Temmernan https://doi.org/10.1103/PhysRevB.37.5158
  3. Phys. Rev. Lett. v.61 Anomalous Disappearance of High-$T_{c}$ Superconductivity at High Hole Concentration in Metallic $La_{2-x}$SrχCuO₄ J.B.Torrance;Y.Tokura;A.I.Nazzal;A.Bezinge;T.C.Huang;S.S.P.Parkin https://doi.org/10.1103/PhysRevLett.61.1127
  4. Nature v.327 Structure and Crystal Chemistry of High-$T_{c}$ Superconductor YBa₂Cu₃$O_{7-y}$ W.1.F.David;W.T.A.Harrison;J.M.F.Gunn;O.Moze;K.Zang;J.D.Grace https://doi.org/10.1038/327310a0
  5. Phys. Rev. v.B35 X-ray Absorption Studies of $La_{2-x}$(Ba,Sr)χ CuO₄Supercoductors J.M.Tranquada;S.M.Heald;A.R.M.Bough;M.Suenaga
  6. Jpn. J. Appl. Phys. v.27 Crystal Substructure of Bi-Pb-Sr-Ca-Cu-O System H.Sawa;H.Fujiki;K.Tomomoto;J.Akimitsu https://doi.org/10.1143/JJAP.27.L830
  7. Jpn. J. Appl. Phys. v.27 Single Crystal X-ray Structure Analysis of Bi₂(Sr,Ca)₂CuOχ and Bi₂(Sr,Ca)₃Cu₂Oχ Superconductors K.Imai;I.Nakai;T.Kawashima;S.Sueno;A.Ono https://doi.org/10.1143/JJAP.27.L1661
  8. Phys. Rev. v.B39 Bismuth Cuprate High-$T_{c}$ Superconductors Using Cationic Substitution J.M.Tarascon;P.Barboux;G.W.Hull;R.Ramesh;L.H.Greene;M.Giroud;M.S.Hedge;W.R.McKinnon
  9. Physica C v.162-164 Effect of Substitution of 3d Metals for Cu in Bi₂($Sr_{0.6} Ca_{0.4}$)₃Cu₂$O_{y}$ K.Uchinokura;T.Yabe;S.Takebayashi;M.Hase;A.Maeda https://doi.org/10.1016/0921-4534(89)90553-4
  10. Phys. Rev. v.B41 Substitution of 3d Metals for Cu in Bi₂($Sr_{0.6} Ca_{0.4}$)₃Cu₂$O_{y}$ A.Maseda;T.Yabe;S.Takebayash;M.Hase;K.Uchinokura
  11. Phys. Rev. v.108 Theory of Superconductivity J.Bardeen;L.N.Cooper;J.R.Schrieffer https://doi.org/10.1103/PhysRev.108.1175
  12. Phys. Rev. v.B55 Superconducting Order Parameter in Partially Substituted Bi₂Sr₂CaCu₂$O_{8+x}$ Single Crystals as Measured by the Tunneling Effect H.Hancotte;R.Deltour;D.N.Davydov;A.G.M.Jansen;P.Wyder
  13. J. Phys. Chem. Solids v.54 Tunneling and Infrared Spectroscopy on High $T_{c}$ Superconductors J.Hartge;L.Forro;D.Mandrus;M.C.Martinl;C.Kendzioral;L.Mihaly https://doi.org/10.1016/0022-3697(93)90194-V
  14. Physica C v.282-287 Tunneling Spectroscopy in Bi₂Sr₂CaCu₂$O_{8+x}$ Single Crystals Break Junctions: Reproducible Determinination of the Eliashber and Role of the Breakdown of Migdal's Theorem R.S.Gonnlli;G.A.Ummarino;V.A.Stepano https://doi.org/10.1016/S0921-4534(97)00842-3