/,
S=1/2 S=0 S=1/2
-
S// m H m H = S G
e + +
G Z (t) 1 0 t
G Z (t) 1 0 t
G Z (t) 1 0 t
SR
G Z (t) = 1/3 + (2/3)(1-2 t 2 )exp(- 2 t 2 /2) G Z (t) 1-1/3 1/3 0 3/ 3/ t
G Z (t) = 1/3 + (2/3)(1-2 t 2 )exp(- 2 t 2 /2) G Z (t) - 1 G Z (t) 1 1/3 1/3 0 3/ 3/ t 1/3 1/3 0 t 1/3 x -1 1/3 y 1/3 z z 1/3 G Z (t) = 1 2/3 G Z (t) = 0 0 G Z (t) 1 t
SR G Z (t) 1 1/3 z 0 t
SR G Z (t) G Z (t) G Z (t) 1 1 1 0 t 0 t 0 t -1
SR G Z (t) G Z (t) 1 1 1/3 1/3 0 t 0 t
SR G Z (t) 1 G Z (t) 1 0 t 0 t
SR G Z (t) G Z (t) 1 1 1/3 1/3 0 t 0 t
25 La 2-x Sr x Cu 1-y Fe y O 4 x = 0.225 y = 0.01 Raw Asymmetry (%) 20 15 10 0 2 4 6 8 10 Time (µsec) T = 20.5 K 12.0 10.1 9.1 8.1 1.9 Normalized Asymmetry 1.0 0.5 0 La 1.85 Sr 0.15 Cu 0.90 Ni 0.10 O 4 3 K 2 K 0.3 K 20 K 5 K 0 1 2 Time (µsec)
N. Nishida et al., Jpn. J. Appl. Phys. 26 (1987) L1856
SR LF- SR) G Z (t) G Z (t) 1 1 0 t 0 t
SR TF- SR) T > T c G Z (t) 1 0 t -1
TF- SR T < T c H c1 < H < H c2 H c1 < H < H c2 vortex vortex (m*/n s ) 1/2
TF- SR -2 n s /m*
SR TF- SR) = ( G Z (t) 1 0-1 t
< 10-9 sec 10-11 10-5 sec > 10-5 sec
Bohr model E n 2 4 Z me = 2 2 8n ε h 2 4πεon h rn = 2 Zme mµ E 207 m E e o 2 µ e 2 r r e µ
2008.12.25
RAL PSI TRIUMF KEK-MSL J-PARC Pulse beam : long relaxation of muon spins DC beam : fast muon-spin precession and fast relaxation of muon spins
The END