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1 1. Web Web Web Web BCS Web Web Web Web Web d Web Web T c 0 T>T c ISTEC 2001 All rights reserved
2 2. T=0K 1 a Eg k B T h Eg exp Eg/k B T h Eg Eg 1(b 2 h Eg (a) (b) ISTEC 2001 All rights reserved
3 ( ) T c ( ) H c ( ) J c T c BCS 2 3.5k B T c k B T c MgB 2 T c 40K H c H c H c T c 2 J c J c 4. (1) ISTEC 2001 All rights reserved
4 0 d (2) 0 T c T c T<T c T>T c (3) T c T c T c n s 5. BCS 1(a) ( ) E F 1cm ev 1eV e = C 1V 1eV 1 K 1eV 10 8 cm/s 1/100 ev E F BCS L. Cooper E F 2 2E F Cooper 2 2 2E F 2E F E E E =2h exp( 2/N(0)V) V N(0) E F ISTEC 2001 All rights reserved
5 E F ev E F 2 E F 2 E F 2 3 1meV E F 3 3 (E F ) 6. 2 U=N(0) 2 E F N(0) ( E ) N(0) N(0) U N(0) ( ) N(0) 1 10 cm/s hv F /2 (v F ) cm ISTEC 2001 All rights reserved
6 (T=0K) 1(b) 2 1 BCS ( )n s 2 n s T c (T) 4 T c k B T c T=0K (0) (2 (0)=3 5k B T c ) 4 7. BCS ( ) ISTEC 2001 All rights reserved
7 SQUID x p h( x p h x p 0 (x) e ipx/h n n 1 (x) px/h 2 5 E F E F p 0 BCS n 1 5 E F E F 5 E F 1 0 E F E F E F E F k B T c ISTEC 2001 All rights reserved
8 T c 2 6 / 1), 2) 1) A. Yazdani et al., Science 275,1767 (1997). 2) E. Hudson et al., Nature 411, 920(2001). 5 T=0 T=0 6 ISTEC 2001 All rights reserved
9 8. i (q/m)(h qa) q A n s j j (2en s /m)( 2eA) 0 j s ( 4e 2 n s /m)a A j s A L (mc 2 /n s e 2 ) 1/2 L µ m j s 1 L L n s n s hv F / L 2 n s n s n s T=0K n s 9.1 d s d n s ISTEC 2001 All rights reserved
10 1 n s n s n s ps (n s e 2 /m) 1/2 ps 0 > ps T c T c T c T c n s T c n s h ps ps ( ) T c > ps n s T c T c n s 7 9. Cu d s MgB 2 C 60 s 0 T c 2 (0) 3 5k B T c 0 T c T>T c U 0 U T c 0 U x 8 T c x x T c 0 0 x T c T c 0 U 0 BCS ISTEC 2001 All rights reserved
11 d 0 8 Tc 0 (x) U x 9.2 d s d T c 9 4 d 2 k x k y s 2 d s 2 0 d 0 d I c R n Web SFQ I c R n d c Cu 9 d c CuO 2 t c k x k y t c ( ) YBaCuO Hg1201 Tl1201 t c 9 d t c LaSrCuO Bi t c t c 0 ISTEC 2001 All rights reserved
12 9 d k x k y k x k y 1 Cu4s 4s 4 Cu d d Bi meV STM 0 100meV hv F / meV meV 0 50meV T c d BCS T c k B T c 0 50meV Tc T c 300K T c 90K n s 0 T c T c 0 n s n s x T c x(n s ) x(n s ) ISTEC 2001 All rights reserved
13 T c T c T c 1 CuO 2 3 CuO CuO 2 CuO 2 Cu MgB 2 T c 117K C 60 FET 2 4k B T c Cu ISTEC 2001 All rights reserved
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