Electron-phonon coupling in κ-(BEDT-TTF)2Cu(NCS)2 organic superconductor studied by Raman scattering spectroscopy

被引：0
|
作者：
Pedron, D. [1 ]
Bozio, R. [1 ]
Schlueter, J.A. [2 ]
Kelly, M.E. [2 ]
Kini, A.M. [2 ]
Williams, J.M. [2 ]
机构：
[1] Department of Physical Chemistry, University of Padova, Via Loredan 2, I-35131 Padova, Italy
[2] Chem. and Mat. Science Divisions, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, United States
来源：
Synthetic Metals | 1999年 / 103卷 / 1 -3 pt 3期
关键词：
Low frequency Raman spectra of K-(ET)&u(NCS)~ measured on a single crystal in a wide range of temperatures, above and below T,, allowed us to observe self-energy effects induced by the SC transition on the low-lying intermolecular phonons. Very low power density of the exciting laser field was used to avoid local heating of the irradiated volume. All the observed phonons lie above the BCS gap, and their frequencies increase below T,. The observed relative frequency shifts are consistent with those already reported for tc-(ET),Cu[N(CN),]Br [.5], but they are lower and, with the exception of the phonon at 65.8 cm, close to the experimental uncertainty. In general the intermolecular electron-phonon coupling appears weaker in K-(ET)&u(NCS)~ than in K- (ET)2Cu[N(CN),]Br. The low frequency Raman spectra of single crystals of K- (‘3C434Ss-ET)2C~(NCS)2 and K-(~H~-ET)~CU(NCS)~ measured at 10 and 2 K show significant isotopic shifts. Whereas for the 13Cj-Ss substituted compound the measured shifts can be explained as a normal mass effect, for the deuterated crystal the observed full isotopic shift is larger than that predicted by the product rule and justifies the suggested lattice softening induced by deuteration [16]. We thank P. Ingenito for useful discussion and technical help during the first part of this work and G. Marcolongo for technical help in the second part. Financial support by the Italian Ministry of University and the National Research Council is acknowledged. Work at Argonne Nat. Lab. is sponsored by the U.S. Department of Energy, Office of Basic Energy, Division of Materials Sciences,u nder contract W-31-109-ENG-38;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
20
引用
收藏
页码：2220 / 2223
相关论文
共 50 条
  • [41] MAGNETIC PENETRATION DEPTH IN THE ORGANIC SUPERCONDUCTOR KAPPA-[BEDT-TTF]2CU[NCS]2
    HARSHMAN, DR
    KLEIMAN, RN
    HADDON, RC
    CHICHESTERHICKS, SV
    KAPLAN, ML
    RUPP, LW
    PFIZ, T
    WILLIAMS, DL
    MITZI, DB
    PHYSICAL REVIEW LETTERS, 1990, 64 (11) : 1293 - 1296
  • [42] MAGNETIC BREAKDOWN EFFECT IN ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2CU(NCS)2
    SASAKI, T
    SATO, H
    TOYOTA, N
    SOLID STATE COMMUNICATIONS, 1990, 76 (04) : 507 - 510
  • [43] Thermodynamic behavior of the 10 K class organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 studied by relaxation calorimetry
    Yamashita, S
    Ishikawa, T
    Fujisaki, T
    Naito, A
    Nakazawa, Y
    Oguni, M
    THERMOCHIMICA ACTA, 2005, 431 (1-2) : 123 - 126
  • [44] A Raman study of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 at high pressure
    McDonald, RD
    Klehe, AK
    Jephcoat, AP
    Olijnyk, H
    Sasaki, T
    Hayes, W
    Singleton, J
    JOURNAL OF PHYSICS-CONDENSED MATTER, 2001, 13 (15) : L291 - L298
  • [45] Lattice dynamics and electron-phonon coupling in the β-(BEDT-TTF)2I3 organic superconductor
    Girlando, A
    Masino, M
    Visentini, G
    Della Valle, RG
    Brillante, A
    Venuti, E
    PHYSICAL REVIEW B, 2000, 62 (21): : 14476 - 14486
  • [46] RESONANT RAMAN-SCATTERING ON SINGLE-CRYSTALS OF (BEDT-TTF)2CU(NCS)2
    ZAMBONI, R
    SCHWEITZER, D
    KELLER, HJ
    SOLID STATE COMMUNICATIONS, 1990, 73 (01) : 41 - 44
  • [47] Tunneling spectroscopy on the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 using STM -: art. no. 104518
    Arai, T
    Ichimura, K
    Nomura, K
    Takasaki, S
    Yamada, J
    Nakatsuji, S
    Anzai, H
    PHYSICAL REVIEW B, 2001, 63 (10)
  • [48] MEISSNER EFFECT IN AN ORGANIC SUPERCONDUCTOR (BEDT-TTF)2[CU(NCS)2]
    NOZAWA, K
    SUGANO, T
    URAYAMA, H
    YAMOCHI, H
    SAITO, G
    KINOSHITA, M
    CHEMISTRY LETTERS, 1988, (04) : 617 - 620
  • [49] Anisotropic superconductivity in κ-(BEDT-TTF)2Cu(NCS)2
    Tsubokura, Y.
    Miyamoto, M.
    Ikeda, K.
    Nakamura, T.
    Takahashi, T.
    Synthetic Metals, 1995, 70 (1 -3 pt 2): : 913 - 914
  • [50] Heat conduction in κ-(BEDT-TTF)2Cu(NCS)2
    Belin, S
    Behnia, K
    Deluzet, A
    PHYSICAL REVIEW LETTERS, 1998, 81 (21) : 4728 - 4731
12345