High-field ESR in TDAE-C60

被引:16
作者
Blinc, R
Cevc, P
Arcon, D
Omerzu, A
Mehring, M
Knorr, S
Grupp, A
Barra, AL
Chouteau, G
机构
[1] Jozef Stefan Inst, Ljubljana 1000, Slovenia
[2] Univ Stuttgart, Inst Phys 2, D-70550 Stuttgart, Germany
[3] CNRS, MPI FKF, Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France
来源
PHYSICAL REVIEW B | 1998年 / 58卷 / 21期
关键词
D O I
10.1103/PhysRevB.58.14416
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The ESR spectra of TDAE-C-60 single crystals have been measured between 30 MHz and 245 GHz both above and below T-c= 16 K. No separate TDAE(+) ESR signal has been seen even at high fields suggesting that the TDAE(+) and C-60(-) spins are either strongly exchange coupled or that spin cancellation and charge separation of the TDAE ions take place. The nonlinear variation of the resonance frequency versus resonance field relation characteristic of ferromagnetic resonance has been observed only in the radio frequency but not in the microwave region. No second "hard" mode characteristic for a spin-canted "weak" ferromagnet could be observed between 0 and 100 kG. The additional fine structure seen in the high-field ESR spectra below T-c is due to standing spin-wave resonance. It allows for the determination of the exchange coupling constant J = 60 K. The exchange field H-E =448 kG is thus much larger than the anisotropy field H-K= 29 G determined from the ferromagnetic resonance data. The temperature dependence of the magnetization determined from the spin-wave resonance data can be indeed described by the Bloch T-3/2 law as expected for an isotropic or nearly isotropic Heisenberg ferromagnet. [S0163-1829(98)02445-X].
引用
收藏
页码:14416 / 14423
页数:8
相关论文
共 23 条
  • [11] EXCITATION OF SPIN WAVES IN A FERROMAGNET BY A UNIFORM RF FIELD
    KITTEL, C
    [J]. PHYSICAL REVIEW, 1958, 110 (06): : 1295 - 1297
  • [12] CATION RADICAL OF TETRAKIS(DIMETHYLAMINO)ETHYLENE
    KUWATA, K
    GESKE, DH
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1964, 86 (11) : 2101 - &
  • [13] SPONTANEOUS MAGNETIC-ORDERING IN THE FULLERENE CHARGE-TRANSFER SALT (TDAE)C-60
    LAPPAS, A
    PRASSIDES, K
    VAVEKIS, K
    ARCON, D
    BLINC, R
    CEVC, P
    AMATO, A
    FEYERHERM, R
    GYGAX, FN
    SCHENCK, A
    [J]. SCIENCE, 1995, 267 (5205) : 1799 - 1802
  • [14] THEORY OF MAGNETIC RESONANCE IN ALPHA-FE2O3
    PINCUS, P
    [J]. PHYSICAL REVIEW LETTERS, 1960, 5 (01) : 13 - 15
  • [15] Magnetic ordering in fullerene charge-transfer complexes
    Sato, T
    Yamabe, T
    Tanaka, K
    [J]. PHYSICAL REVIEW B, 1997, 56 (01): : 307 - 314
  • [16] MOLECULAR FERROMAGNETISM IN C60.TDAE
    SESHADRI, R
    RASTOGI, A
    BHAT, SV
    RAMASESHA, S
    RAO, CNR
    [J]. SOLID STATE COMMUNICATIONS, 1993, 85 (11) : 971 - 974
  • [17] MAGNETIC-PROPERTIES OF TDAE-C-60 AND TDAE-C-70 WHERE TDAE IS TETRAKIS(DIMETHYLAMINO)ETHYLENE
    TANAKA, K
    ZAKHIDOV, AA
    YOSHIZAWA, K
    OKAHARA, K
    YAMABE, T
    YAKUSHI, K
    KIKUCHI, K
    SUZUKI, S
    IKEMOTO, I
    ACHIBA, Y
    [J]. PHYSICAL REVIEW B, 1993, 47 (12): : 7554 - 7559
  • [18] MAGNETIC-PROPERTIES OF TDAE-C60 AND TDAE-C70 - A COMPARATIVE-STUDY
    TANAKA, K
    ZAKHIDOV, AA
    YOSHIZAWA, K
    OKAHARA, K
    YAMABE, T
    YAKUSHI, K
    KIKUCHI, K
    SUZUKI, S
    IKEMOTO, I
    ACHIBA, Y
    [J]. PHYSICS LETTERS A, 1992, 164 (02) : 221 - 226
  • [19] Irreversible and time-dependent magnetization in TDAE-C-60
    Tokumoto, M
    Song, YS
    Tanaka, K
    Sato, T
    Yamabe, T
    [J]. SOLID STATE COMMUNICATIONS, 1996, 97 (05) : 349 - 354
  • [20] TUROV EA, 1965, PHYSICAL PROPERTIES