CU-63,CU-65 AND O-17 SPIN-ECHO DECAY AND THE STATIC SUSCEPTIBILITY X'(Q) IN LA1.85SR0.15CUO4

被引:70
作者
WALSTEDT, RE
CHEONG, SW
机构
[1] AT and T Bell Laboratories, Murray Hill, NJ 07974
来源
PHYSICAL REVIEW B | 1995年 / 51卷 / 05期
关键词
D O I
10.1103/PhysRevB.51.3163
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Data are presented and analyzed for the nuclear spin-echo decay of Cu63,65 and O17 in La1.85Sr0.15CuO4 at T=100 K. The echo-decay data are compared with calculated waveforms in which time fluctuations of coupled neighbor spins are taken into account. Data for the two copper isotopes are found to show the effects of both T1 and nuclear spin exchange fluctuations. Experimental decay rates for the Cu63,65 are in good agreement with indirect nuclear spin-spin interactions calculated using values of (q,0) inferred from neutron-scattering data for S(q,) for this system. For O17, the echo decay is found to be in good agreement with an interpretation based on Cu-O nuclear dipolar couplings alone, in which the same Cu T1 and nuclear spin exchange values are employed as for the copper echo decay. Calculated Cu-O indirect couplings of comparable magnitude to the dipole-dipole terms are therefore concluded to be absent. We further conclude that the transferred Cu-O hyperfine coupling is much smaller than that deduced from the measured O17 NMR shift. It follows that the excitations which provide the O17 NMR shift and relaxation are separate and distinct from those associated with spin fluctuations on the copper sites. Similar conclusions were reached in a recent study of O17 nuclear spin-lattice relaxation in this system. © 1995 The American Physical Society.
引用
收藏
页码:3163 / 3175
页数:13
相关论文
共 55 条
[51]   EVIDENCE FOR 2 PAIRING ENERGIES FROM NUCLEAR-SPIN-LATTICE RELAXATION IN SUPERCONDUCTING BA2YCU3O7-DELTA [J].
WARREN, WW ;
WALSTEDT, RE ;
BRENNERT, GF ;
ESPINOSA, GP ;
REMEIKA, JP .
PHYSICAL REVIEW LETTERS, 1987, 59 (16) :1860-1863
[52]   CU SPIN DYNAMICS AND SUPERCONDUCTING PRECURSOR EFFECTS IN PLANES ABOVE TC IN YBA2CU3O6.7 [J].
WARREN, WW ;
WALSTEDT, RE ;
BRENNERT, GF ;
CAVA, RJ ;
TYCKO, R ;
BELL, RF ;
DABBAGH, G .
PHYSICAL REVIEW LETTERS, 1989, 62 (10) :1193-1196
[53]   COPPER NMR AND NQR IN LA2-XSRXCUO4 - NO EVIDENCE FOR COEXISTENCE OF MAGNETIC-ORDERING AND SUPERCONDUCTIVITY DOWN TO 1.3-K [J].
YOSHIMURA, K ;
IMAI, T ;
SHIMIZU, T ;
UEDA, Y ;
KOSUGE, K ;
YASUOKA, H .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1989, 58 (09) :3057-3060
[54]   NMR-STUDIES OF O-17 IN THE NORMAL STATE OF YBA2CU3O6+X [J].
YOSHINARI, Y ;
YASUOKA, H ;
UEDA, Y ;
KOGA, K ;
KOSUGE, K .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1990, 59 (10) :3698-3711
[55]   EFFECTIVE HAMILTONIAN FOR THE SUPERCONDUCTING CU OXIDES [J].
ZHANG, FC ;
RICE, TM .
PHYSICAL REVIEW B, 1988, 37 (07) :3759-3761