Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.issp.ac.ru/kafedra/thesis/2013/master/Bulanchuk.pdf Дата изменения: Wed Jul 3 16:57:24 2013 Дата индексирования: Fri Feb 28 05:00:45 2014 Кодировка: Поисковые слова: m 5

( )

-(BETS)2Mn1-xCox(N(CN)2)3, -
722 ..

: . .-. . . .

2013


2


.............................................................................................................................. 3 .............................................................................................................................. 5 .............................................................................................................................. 5 ................................................................................................................. 6 ................................................................................................................................................ 7 ....................................................................................................... 8 .................................................................................................... 8 ............................................................................................................................... 15 ............................................................................................................ 16 1 .................................................................................................................... 18 2 .................................................................................................................... 19


3


, . - - [1]. , . , (BEDT-TTF) (BETS) [2], [3,4] . , , , , -(BETS)2FeCl4 [5] (BETS)2FeBr4 [6]. -(BETS)2Mn[N(CN)2]3 ( BETS-Mn) [711], .
Mn[N(CN)2 ]3 ,

- BETS (. 1). - =27 (. 2). P, , > 0.5 =5.8 . . 3. 102 K q = 0.42 b* . , R (T ) (. 2), - () H 7 T [8]. «» -.


4

c)

a) b)

d)

. 1. BETS-Mn.[7] a) ( a . b) BETS. c) d) BETS .

[9,11], 3d Mn2+ 2 , - . , ( ) - . , , - -, 3d Mn2+ -d . (BETS)2Mn1-xCox[N(CN)2]3 ( BETS-MnCo) x=0.13, BETS-Mn, Mn2+ Co2+. , (1/2 3/2 5/2 BETS-Mn). .


5

2. [8] BETS-Mn . b) ) : =102 K.

.3. [8] BETS-Mn. 0,3 ­ 0,5 kbar .

BETS-MnCo, 123 K, BETS-Mn [8]: a=19.4307(5) е, b=8.3884(2) е, c=11.9289(3) е, ==90, =92.416(1). BETS-MnCo , , BETS-Mn. R(T ) , T-P -.

R(T ) , .


10В50 0.4В1.0 , . , , ( 20 ) (. 4). -


6

. .

43 12

4. . 4-3, 2-1.

(. . 5). (), , . , (120 ), , , (). . 15 K. . ( ) . 5. , . 3.7 ( ), 30 1.1 .


7

5.

. , ~10 0.1. , . , BETS-MnCo , 0.2 . , 1 , 4 ( ), ( , ­ ). , : 1) 0.4-300 K. 2) 17 . 3) ~10 0.1.


8

. . 6.

. 6.

(R=106 ) (~170 ) , (. 6). , , . 1 , .. 1 mkA, . , HP34401A. GPIB , LabView.


, R(T ) BETS-MnCo, . «» 86 106 K, 22 ­ 28 K (. 7). «» R(T) . , ([12-14]). , ,


9

, . . 7 , BETS-MnCo , BETS-Mn T>20 K, T<20 K BETS-Mn. BETS-MnCo (. .8). . , , . .

0

1.5
R/R
0

R/R

1.0 0.5







T, K







15

20

25 T, K

30

7. R(T) BETS-Mn ( ) BETS-MnCo ( ) . R0=R(250 K)

8. BETS-MnCo

, BETS-MnCo T=102 K, BETS-Mn, . , BETS-MnCo . , BETS-Mn [8], , , - . BETS-MnCo 17 0.4 K, . BETS-MnCo -


10

, BETS-Mn [8] , BETS-MnCo .
0 0 0 0 1 2 2 k bar kbar kbar kbar kbar kbar kbar

R,

6000
R,

T, K

4000 2000 0 0

.5 .8 .9 .6 .1 .8

400 200 0 123456 TK T,, K

7 6 5 4 3
BETS-MnCo BETS-Mn

4 4 9 6 8

Tc

50

100 150 T, K

200

2

1

P, kbar 2

3

9. R(T) BETS-MnCo . R0=R(250 K)

10. P-T BETS-Mn BETS-MnCo -

P-T . R(T ) (. 9), . . 10. , BETS-MnCo . , . 10 , , 2 kbar .

1000 800
R,

Tc
0 koe 10 oe 20 oe 35 oe 50 oe 0.1 ko 0.2 ko 0.4 ko 0.8 ko 1.6 ko 2.2 ko

1000 800
e e e e e e

Hc2

R,

600 400 200 0 2 3 4 T, K 5

600 400 200 0 0 10 20 30 H, kOe

2 2 2 1 1

. . . . .

7 4 0 7 5

K K K K K

40

11. H || a

12. H || a


11

H-T . R(T ) R( H ) 0.9 1.1 kbar H || a ( . 11 .12). H c 2 (T ) , . 13. , H c 2 (T ) .
30
0.2

slope = 0.56

H, kOe

25 20
H, kOe

kOe K

0.1 0.0

4.3

4.4

4.5

15 10 5 0

T, K
BETS_MnCo(1) 1.1 kbar BETS_MnCo(2) 0.9 kbar

H || a

0

2

T, K

4

13. H c 2 (T ) H || a

R(T ) H || (b , c ) 0,9 kbar (.
. 14), H c 2 (T) (. . 15). ,

T / Tc , , , ( BETS-Mn) (.16, 17). H || (b , c )


12

WHH (Werthamer-Helfand-Hohenberg) [15], , [16].

1.2

P=0,9 kbar
1.0 0.8
0

Tc
0 kOe 5 kOe 10.9 kOe 20.2 kOe 27.7 kOe 35.0 kOe 49.0 kOe 60.5 kOe 70.9 kOe

R/ R

0.6 0.4 0.2 0.0

1

2

3

4

5

6

T, K
14. H || (b , c ) .

80
BETS-MnCo(2) 0.9 kbar

60

Hc2 , kOe

40

H || (b , c )

20
107 kOe/K

0

3

4

T, K
15.


H c 2 /H

1.0 0.8
20

c20

0.005

0.2
BETS_MnCo(1) 1.1 kbar BETS_MnCo(2) 0.9 kbar BETS_Mn 1.1 kbar BETS_Mn 1.4 kbar [20]

Hc2/Hc

Hc2/H

0.6 0.4 0.2 0.0 0.0 0.2

T/Tc

c20

0.000 0.92

0.96

1.00

4 .5
BETS-Mn 1.4 kbar [20] BETS-MnCo(2) 0.9 kbar
WHH [15] [16]

0.1

0.4 0.6 T/Tc

0.8

1.0

0.0 0.00

0.25

0.50
T/Tc

0.75

1.00

. 16. H c 2 / H c 20 H || a . H c 20 , .

. 17. H c 2 / H c 20 H || (b , c ) BETS-Mn BETS-MnCo. [16] . H
c 20


c 20

WHH [15] , H c 2 (0) / H

1.

- (. 1). , :

m : m||

2

H H c 2|| : c 2 T T

2

2

(1)

(1) , H c 2 (T ) . :

m (38 5) 10 m||

3

BETSMn (32 10) 103 ( ). || - .

0 || 2 H

c 2||





1 2

8.06 10 H

3

c 2||

1 2

1 koe 2 ,


14

2 H

0 c 2





1 2

40.8 H

c 2

1 2

1 koe 2 ,

0 ­ , (1). , 4 kOe a 19.4 е , - .


15


(BETS)2Mn1-xCox[N(CN)2]3 c x=0,13 (BETS)2Mn[N(CN)2]3. , -

BETS-MnCo T=102 K. R(T ) T=102 K, . ,

, BETS-Mn. T-P . Hc2(T) -

(P=0.9 kbar P=1.1 kbar) (P=0.9 kbar) . , BETS-Mn 1.4 kbar. , Hc2(T) H || (b , c ) , . Hc2(T)

, - :

m (38 5) 103 , m||
, BETS-Mn. . . . . , .


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10.1103/PhysRevB.77.035115


17 [14] Perez Moses and Ross H. McKenzie, Phys. Rev. B 60, 7998, doi: 10.1103/PhysRevB.60.7998 [15] N. R. Werthamer, E. Helfand, P. C. Hohenberg: Phys. Rev. 147, 295, 1966, doi: 10.1103/PhysRev.147.295 [16] Kazumi Maki, Phys. Rev. 141, 1, 1966, doi: 10.1103/PhysRev.148.362 [17] R. A. Klemm and A. Luther, Phys. Rev B 12, 877­891, 1975, doi: 10.1103/PhysRevB.12.877 [ 1 8] 2000 [ 1 9] , [20] . . , , . 2-, . ., .: , . . , . . , , .: - 1998


18

1
- [18,19] :
2 4 GsH Gn

1 2e 1 2e i| A| i z A z | | 4 m|| c 4m c A 8

2

2

(2)





2





A H0 dV 4

.. H c 2 , . -, (2), :




1 Dx 2 D 4m||

2 y





1 Dz 2 0, 4m

(3)

Di ii
( y , z ) :

2e Ai . c

(4)

H H 0, sin , cos , A Hx 0, cos , sin
(3)



(5)

H c 2 (T , )

2 0

m||

1



m|| cos m sin

1

2

1

2



(6)

:

m H c 2 (T , / 2) m|| H c 2 (T , 0)

2


19

2
. , , ­ . , . : ( ), ­ . . . 13.

0,10 0,05
- TR18 (K)

0.5 K/ 1 K/

0,00 -0,05 -0,10 -0,15 -0,20 1 2 3 4 5 6 7 8

5 K/

Ts

ample

9

TR18 (K)
. 18. .

, 0,02 , , . ( 0,2 6) .