Proton NMR in a TDAE-C-60 single crystal

被引:15
作者
Arcon, D
Dolinsek, J
Blinc, R
Pokhodnia, K
Omerzu, A
Mihailovic, D
Venturini, P
机构
[1] J. Stefan Institute, University of Ljubljana, Ljubljana
来源
PHYSICAL REVIEW B | 1996年 / 53卷 / 21期
关键词
D O I
10.1103/PhysRevB.53.14028
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The temperature dependence of the methyl proton NMR shift of a TDAE-C-60 single crystal follows a Curie-Weiss law above T-C with a positive Curie temperature T-C approximate to 12 K as expected for the case of a ferromagnetic transition. Below T-C the shifts are proportional to the magnetization and saturate below 10 K. The internal field at the TDAE protons amounts at 6 K to 600 G and exceeds by an order of magnitude the internal field determined by electron-spin resonance at the C-60(-) ions. The result shows that in addition to the direct C-60(-)-C-60(-) interactions which seem to be of antiferromagnetic nature, a part of the exchange coupling between the C-60(-) ions is mediated by the TDAE(+) groups. It is this indirect coupling which might give rise to the Dzyaloshinsky-Moriya term in the spin Hamiltonian which is responsible for weak ferromagnetism in this system.
引用
收藏
页码:14028 / 14031
页数:4
相关论文
共 20 条
  • [1] ORGANIC MOLECULAR SOFT FERROMAGNETISM IN A FULLERENE-C60
    ALLEMAND, PM
    KHEMANI, KC
    KOCH, A
    WUDL, F
    HOLCZER, K
    DONOVAN, S
    GRUNER, G
    THOMPSON, JD
    [J]. SCIENCE, 1991, 253 (5017) : 301 - 303
  • [2] C-13 NMR of the organic ferromagnet TDAE-C-60
    Arcon, D
    Dolinsek, J
    Blinc, R
    [J]. PHYSICAL REVIEW B, 1996, 53 (14): : 9137 - 9142
  • [3] BLINC B, 1995, P S REC ADV CHEM PHY, P935
  • [4] PROTON NMR OF THE MAGNETIC TRANSITION IN TDAE-C60
    BLINC, R
    DOLINSEK, J
    ARCON, D
    MIHAILOVIC, D
    VENTURINI, P
    [J]. SOLID STATE COMMUNICATIONS, 1994, 89 (06) : 487 - 491
  • [5] Antiferromagnetic correlations and weak ferromagnetism in a TDAE(+)-C-60(-) single crystal
    Blinc, R
    Pokhodnia, K
    Cevc, P
    Arcon, D
    Omerzu, A
    Mihailovic, D
    Venturini, P
    Golic, L
    Trontelj, Z
    Luznik, J
    Jeglicic, Z
    Pirnat, J
    [J]. PHYSICAL REVIEW LETTERS, 1996, 76 (03) : 523 - 526
  • [6] CRISTOFOLINI L, 1994, PROGR FULLERENE RES, P279
  • [7] A THERMODYNAMIC THEORY OF WEAK FERROMAGNETISM OF ANTIFERROMAGNETICS
    DZYALOSHINSKY, I
    [J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1958, 4 (04) : 241 - 255
  • [8] Gotschy B., 1995, Physics and Chemistry of Fullerenes and Derivatives. Proceedings of the International Winterschool on Electronic Properties of Novel Materials, P496
  • [9] CRYSTAL-GROWTH OF CYANO-PLATINUM COMPLEXES BY A NEW DIFFUSION REACTION TECHNIQUE
    GUGGENHE.HJ
    BAHNCK, D
    [J]. JOURNAL OF CRYSTAL GROWTH, 1974, 26 (01) : 29 - 32
  • [10] 3-CHAMBER DIFFUSION APPARATUS FOR GROWTH OF SINGLE-CRYSTALS OF ORGANIC DONOR-ACCEPTOR SALTS
    KAPLAN, ML
    [J]. JOURNAL OF CRYSTAL GROWTH, 1976, 33 (01) : 161 - 164