Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://phys.msu.ru/upload/iblock/623/2006-15-06-bogdanov.pdf Äàòà èçìåíåíèÿ: Wed Sep 17 23:24:50 2008 Äàòà èíäåêñèðîâàíèÿ: Mon Oct 1 21:05:43 2012 Êîäèðîâêà: Windows-1251 Ïîèñêîâûå ñëîâà: m 13

. .. _____________________________________________________________



R-Mn-Ge

C 01.04.11 --

-

, 2006


. . : - , . . , - , . . - , . . , - , . .

:

:

'15' 2006 . 501.001.02 . . . : 119992, -2, , , , , .

. . . .

'

' 2006 .

501.001.02, -

. .

2


. R-T-X (R -- , -- 3d- , X -- p- (Si, Ga, Ge)) . . . R-Mn-X , , . , , R-Mn-X. T = Fe, Co, Ni R-T-X 3d- . R-Mn-X , (200 600 K), ( .), . , R-Mn-X , 3d- p-. , R-Mn-X. R-Mn-X , . , , , , . . R-Mn-Ge, , RMnGe RMn6Ge6 , . . . 1. GdMnGe. - . 3


2. RMnGe (R = Gd, Tb, Dy) , . 3. TbMnGe DyMnGe -. 4. ( ,N, P, ÷eff) RMnGe0.5Ga0.5 (R = Gd, Tb, Dy, Ho), 140 kOe. 5. DyMn6Ge6 DyMn5FeGe6, DyMn5CoGe6, Dy0.8Sm0.2Mn6Ge6, DyMn6Ge5Si 140 kOe. 6. , R-Mn-Ge. , . 1. GdMnGe 4.2 - 700 350 kOe. , GdMnGe 1=100 . 2. TbMnGe DyMnGe 350 kOe 140 kOe, . 3. GdMn1-xTixGe Mn Ti, . 4. RMnGe0.5Ga0.5 (R = Gd, Tb, Dy, Ho). . RMnGe0.5Ga0.5 ( R = Gd, Tb), RMnGe. 5. DyMn6Ge6 140 kOe. DyMn5FeGe6, DyMn5CoGe6, Dy0.8Sm0.2Mn6Ge6, DyMn6Ge5Si 140 kOe. Mn Fe Co DyMn6Ge6. 6. Gd1-xLaxMn6Ge6 c Gd La. , , Mn .

4


. , , , . , . . : XVII, XVIII XIX - ' ', (, 2000, 2002, 2004); (ISM) (, 2002); 'Physics of magnetism' (, 2002); III (, 2000); XVI " " (, 1999). . 5 8 ( 13 ). . , 96 . 125 , 60 . , , , . . RMnGe RMn6Ge6. - . . 1.1 3d- p-, R-R, R-T, T-T. . 1.2 R-T-X. RMnGe RMn6Ge6 . RMnX R -- CeFeSi, TiNiSi ZrNiAl. RMnX R CeFeSiTiNiSiZrNiAl R. CeFeSiTiNiSi 5


Mn-X R-X R . Mn-Mn. TiNiSiZrNiAl -. RTX CeFeSi, ZrNiAl, TiNiSi Si Ge. Si Ge. RTX c () R-X, R-T R-R R, T-X, T-T, X-X . RMn6Ge6 HfFe6Ge6 ( P6/mmm). R, Mn Ge : Ge-Ge-Mn-R-Ge-Mn-Ge-Ge, R Mn. , . RMnGe CeFeSi ( P4/nmm) R = La, Ce, Pr, Nd TiNiSi ( Pnma) R = Gd, b, Dy, Ho, Er, Tm, Yb. RMnGe (R = Y, Dy-Tm) ( TiNiSi) [1]. RMnGe 3d-, RMnGe 240-600 3d-. RMnGe . RMnGe , "" . , . [1] , . , , . RMnGe . C RMn6Ge6 , 400-500 . , , . RMnGe, RMn6Ge6 6


, . R Mn . Mn, R, , R Mn. Mn-R-Mn , . GdMn6Ge6 : , , , . , , . C DyMn6Ge6 . - DyMn6Ge6 N=427 K. (=350 ), (1=258 ) (2=56 ) . [2] , DyMn6Ge6 Mn, , '' Mn, n . DyMn6Ge6 , , 3d-3d . , 4f- 3d- R-Mn-X . , p- R-Mn-X. 50 kOe , . . , , , . . . . ( RMnGe, RMnGe0.5Ga0.5, RMn6Ge6) . . ( (Gd, Tb)MnGe1-xSix, Gd1-xLaxMn6Ge6).

7


. 99.9%. DRON-3.0. 4.28 kOe 4.2 - 300 "Cahn-1000". =1000 Oe =5000 Oe 4.2-700 SQUID . 4.2 300 K . "Intermagnetics", 140 kOe. (). 6 kOe 80-290 . ( ) 13 kOe 78 K 600 K . . RMnGe RMn6Ge6. . 3.1 RMnGe (R = Gd, Tb, Dy). () GdMnGe 4.2 - 280 300 - 700 . 1 2 . , =1000 Oe (. 2), , TN, -, GdMnGe 350 . , - =/T-p: 1/() . P=80.0 , GdMnGe ÷= 8.59 ÷B, =N÷2eff/3kB, ÷eff -- , kB -- . , GdMnGe TbMnGe [3] . 1=100 (. 1) T

4

, ñì

3

/ ã*10
2 0

4

100

200

300

T, K
. 1. () GdMnGe 4.2 -- 295 K
1.5
-4

2
4

/ ã*10

1 0.5

300

400

500

T, K

600

700

800

. 2. () 1/() GdMnGe 300-740
50 40 2
50 40 30 20 10

1/, ã/ ñì

, ñì

3

3

1.0

*10

T=4.2 K

T=60 K

2

30 20 10 0 0 20 40 60 80 100 120

÷, ÷B / f.u. , emu/g

1

1

0 140

0 0 20 40 60 80 100 120

0 140

H, kOe

H, kOe

. 3. GdMnGe 140 Oe

9

÷, ÷B / f.u.

, emu/g


, , , Gd. , 4.2 -60 , .. , . 3. 140 kOe GdMnGe. H80 kOe. , , H80 kOe, GdMnGe. , . Gd Mn . ( 350 kOe) , (H) 4.2 K 2=160 kOe. GdMnGe ( Gd Mn). , (1/H), 5.40 ÷B/f. u. . 3.2 GdMn1-xTixGe. GdMn1-xTixGe Ti x = 0.05, 0.1, 0.2 Ti Mn GdMnGe Mn-Mn Mn-Ge . , . GdMn1-xTixGe Ti 4.2 K . 4 140 . Ti Mn , x = 0.1 0.2 , Ti. , Ti. (H) GdMnGe GdMn0.95Ti0.05Ge 10 kOe. Ti x > 0.05 GdMn1-xTixGe T = 4.2 K. (H) H = 0. , , Ti GdMn1-xTixGe . Ti GdMn1-xTixGe Mn - Mn, Mn - Ge R - Mn. . 3.3 RMnGe0.5Ga0.5 (R = Gd, Tb, Dy, Ho). , 10


120 110 100 90 80

GdMn1-xTixGe

x=0.2

x=0.1

, emu/g

70 60 50 40 30 20 10 0 0 20 40 60 80 100 120 140

x=0.05

x=0

H, kOe

. 4. GdMn1-xTixGe 4.2 x=0, 0.05, 0.1, 0.2

35 30 25
T=4.2 K

1,6 1,4 1,2 0,8 0,6 0,4 0,2 0,0 140
T=70 K

, emu/g

15 10 5 0 0 20 40 60 80 100 120

H, kOe
. 5. GdMnGe0.5Ga
0.5

11

÷, ÷B/f. u.

20

1,0


2,0

, emu/mol * 10

3

1,5
1

1,0

0,5
2

0,0

0

100

200

300

400

Temperature, K
. 6. 1-- GdMnGe0.5Ga0.5 =5 kOe, 2-- GdMnGe0.5Ga0.5 =0.5 kOe

3,0 2,5 2,0
4
5

0,12 0,10 0,08
3

1,5 1,0 0,5 0,0

0,06
2 1

0,04 0,02

80

120

160 T, K

200

240

280

0,00

. 7. TbMnGe0.5Ga0.5. 1-=0.22 kOe, 2 -- =1 kOe, 3 -- =2 kOe, 4 -- =3 kOe. 5 -- TbMnGe, H=5.6 kOe

12

÷, ÷B/ô î ðì .åä .

, emu/g


( TiNiSi ZrNiAl), . (H) GdMnGe0.5Ga0.5 . 5 140 kOe 4.2 K 70 . , 140 kOe. (H) GdMnGe0.5Ga0.5 . (. 6) - T=170 K. , 100-200 K. ( ) p=25.9 K 1/(T) (300 K - 400 K), ÷eff =7.75 ÷B. () TbMnGe0.5Ga0.5, 80-290 6 kOe, . 7. . (T), =0.22 kOe ( 1), - T=100 K , d/dT. T ( 2, 3, 4). TbMnGe0.5Ga0.5 Mn MnX4, . P MnX4 Mn TbMnGe. T=100 K Tb. DyMnGe0.5Ga0.5 oMnGe0.5Ga0.5 . . 3.4 DyMn6Ge6: DyMn5CoGe6, DyMn5FeGe6, Dy0.8Sm0.2Mn6Ge6, DyMn6Ge5Si. , 4.2 , 150 K 300 DyMn6Ge6 . 8 (). DyMn6Ge6 , <60 kOe [4]. DyMn6Ge6 H=140 kOe. T=4.2 K , Mn-Dy-Mn . 50 K

. DyMn6Ge6, =300 , . 140 kOe. -, . , 4.2 K, . , DyMn6Ge6 (Hmax) 4.2 -- 300 . Dy Mn. (T) DyMn6Ge6 =5.3 kOe . 9. , N427 , . , , R-Mn-Ge, N . Mn, . DyMn6Ge6 , [4], - . Mn Co ( 8, c). 4.2 DyMn5CoGe6 1=5 kOe 2 = 55 kOe, . (T=300 K) DyMn5CoGe6 , = 50 kOe . (T) 5.3 kOe (. 9) , DyMn5CoGe6 DyMn6Ge6 427 , 100 280 . DyMn6Ge6 3d-. DyMn5CoGe6 DyMn5FeGe6 3d- , . , 14


DyMn6Ge
40

6

DyMn5CoGe6
40
6

6 30

30

T=4.2 K

5 4

T=4.2 K

5 4

, emu/g

, emu/g

÷, ÷B/f.u.

20

3 2

20

3 2 1

10

10
1

0 0 20 40 60

0

0 0 20 40 60 80 100 120 140

0

H, kOe

80

100

120

140

40 6 30

40

H, kOe
6

T=150 K

5

30

T=150 K

5 4

, emu/g

÷, ÷B/f.u. , emu/g

20

3 2

20

3 2 1

10

10
1

0 0
40

0 20 40 60 80 100 120 140

0 0
40

0 20 40 60 80 100 120 140

H, kOe
6

H, kOe
6 30

T=300 K
30 5

T=300 K

5 4

, emu/g

, emu/g

÷, ÷B/f.u.

20

3 2

20

3 2 1

10

10
1

0 0 20 40 60

0

0 0 20 40 60 80 100 120 140

0

H, kOe

80

100

120

140

H, kOe

. 8. DyMn6Ge6 () DyMn5CoGe6 () ( )

15

÷, ÷B/f.u.

4

÷, ÷B/f.u.

4

÷, ÷B/f.u.


16

DyMn6Ge6

H = 5.3 kOe
2.5 2.0 1.5 1.0 16

Dy0.8Sm0.2Mn6Ge6
2.4

, Gs*cm3/g

12

12

2.0

8

8

1.2 0.8 0.4

4

0.5 0.0

4

0

0

100

200

300

400

500

600

0

0

100

200

300

400

500

600

0.0

4

DyMn5CoGe6
0.6

6

DyMn5FeGe6
0.8

3 0.4 2 0.2 2 4

0.6 0.4 0.2

1

0 0 100 200 300 400 500 600

0.0

0 0 100 200 300 400 500 600

0.0

T, K

. 9. DyMn6Ge

÷B / f.u.
6

1.6

x=0.1
4

1.20

T=469.4 K T=473 K T=467.8 K T=460 K

÷ B /f.u.

0.80

2

H/
0.40

x=0.2

x=0.1

0

0

100

200

300

400

500

T, K 2 . 10. () / 2 (c) Gd1-xLaxMn6Ge6 ( -- *3/)

600 00

0.00

0

200

400

600

16


o Fe Mn. , ÷Fe>÷Co, 3d- , . , Fe-c , o-. . 3.5 Gd1-XLaXMn6Ge6 (x=0.1, 0.2, 0.3). . 10 Gd1-XLaXMn6Ge6 x=0.1 x=0.2. 2.8 kOe. 200 , . () 400-500 K / 2 (. 10) . - , / 2. , =0.1 . 10. , - , /=f(2) , (471 ). , . . . 3.6 RMnGe. RMnGe . [5] , . . [6], . . -- . , , , , . "" , . . . , , :

17


F = - ÷ 2 ( J1 cos + J 2 cos 2 )

(1)

-- , ÷ -- , , J1 - , J2 - , . J1>0, J2<0. , c. , . RMnGe RMn6Ge6 , , , , . R-Mn-Ge , R, Mn. RMnGe , (001), R Mn . TbMnGe DyMnGe , . -- , -- TbMnGe DyMnGe (a, b). R Mn TiNiSi - : Dy3-Mn4-Mn2-Dy1-Dy4Mn3-Mn1-Dy2, , 4() . TbMnGe DyMnGe , (001), . i ( ) : i=(xiqx360)+i, xi - i- , qx - , i - . DyMnGe bMnGe [1], [3]. , i -. , - . , , , - =sin, -- . TiNiSi - . -.

18


: NA - , A - , s - , n2 - , , , -- , , -- , ÷ -- , , H - , . >H , >H0. , , (H) - : 1. Ec H
=

N
A

A

/2

H

0



sin 3 d =

2 N A H. 3A

(2)

2. HK
=

N A H
A

arcsin

0



sin d +

Hk H

3

/2
s H arcsin K H



H - H sin 1 - 0 4 f ( )



sin 2 d .

(3)

3. H>H0,

=

N A H
A
/2
s

arcsin



sin 3 d +

HK H

arcsin s

0


arcsin

H0 H HK H

H - H sin 1 - 0 4 f ( )



sin 2 d +
. (4)

+



sin 2 d
H0 H

arcsin



f ( ) =

H0 2 + (1 + 2 cos 8

(

)2

),
.

(5)

=-

÷

2

32n2 sin 4 ( / 2)(1 + 2 cos (1 + cos ))

(6)

(4) , . H0. , (Tb, Dy)MnGe . HK H0 19


, () = HK . , [1], [3]. , 2-4, . TbMnGe DyMnGe, , 2-4 . 11 12. , , . TbMnGe T=4.2 K H2=HK=162.8 kOe DyMnGe (H2=HK=64.8 kOe). , bMnGe , DyMnGe. n2, (H), -0.145*10-14 (n2/kB=-10.5 ) TbMnGe T=4.2 K, -0.26*10-14 (-18.8 ) -0.27*10-14 (-19.6 ) DyMnGe T=4.2 K T=20 K, . , '' , , R, Mn. n1=÷2J1, n2=÷2J2 |J1|=4|J2|cos . DyMnGe J1=0.543*1024 2/, J2=-1*1024 2/, n1=0.141*10-14 (10.2 ) 4.2 , J1=0.565*1024 2/, J2=-1.04*1024 2/, n1=0.147*10-14 (10.6 ) 20 . , , , H=HK , TbMnGe, c ÷ 6 ÷B, DyMnGe ÷ 3.5 ÷B. , ÷Mn 3.5 ÷B 4.2 . , TbMnGe ÷ 9-3.5=5.5 ÷B, DyMnGe ÷ 10-3.5=6.5 ÷B. , H=HK R Mn (), . R Mn . HK, , , R Mn , .

20


250 200 150 100 50 0
experimental

TbMnGe T=4.2 K
calculated Hk=162.8 kOe Ho=180 kOe s=272.3 emu/g n2=-0.145*10
-14

12 10 8 6 4 ýðã 2 0 400

, emu/g

0

50

100

150

200

250

300

350

H, kOe
. 11. TbMnGe
120 100 80 60 40 20 0 0 20 40 60 80
experimental

6

DyMnGe T=4.2 K
calculated Hk=64.8 kOe Ho=100 kOe s=159.98 emu/g n2=-0.26*10
-14

5

, emu/g

3 2 1 0 160

ýðã

100

120

140

H, kOe
120 100 80

DyMnGe T=20 K

6 5

60
experinental

40 20 0 0 20 40 60

calculated Hk=62.1 kOe Ho=100 kOe s=158.4 emu/g n2=-0.27*10 80 100
-14

3 2 1 140 0 160

ýðã

120

H, kOe
. 12. ( ) DyMnGe

21

÷, ÷B/f. u.

, emu/g

4

÷, ÷B/f.u.

4

÷, ÷B/f.u.


1. GdMnGe , TN=350 , 1=100 . (), 4.2-60 , ( 80 kOe 4.2 ). 2. GdMnGe , , . 3. GdMnGe (x <= 0.2) ( x => 0.1). 3d . 4. RMnGe (R=Gd, Tb, Dy) , . 5. TbMnGe DyMnGe , - , , . 6. ( , , ) RMnGe0.5Ga0.5 (R = Gd, Tb, Dy, Ho). , ( R = Gd, Tb), . 7. DyMn6Ge6, . , DyMn6Ge6 (DyMn5CoGe6 DyMn5FeGe6) , 3d-, 3d-. 22


: 1. Effect of Ga substitution for Ge on magnetic and crystal properties of the GdMnGe1-xGax intermetallics. T. I. Ivanova, S. A. Nikitin, A. E. Bogdanov, A. V. Morozkin, W. Suski, J. K. Warchulska. Intermetallics, 13, 2005, p.857-861 2. TbMnGe TbMnGe0.5Ga0.5. . . , . . , . . . . 3. , . 2005 ., 3, c.36-38 3. A magnetic study of TiNiSi-type GdMn1-xTixGe alloys. T. I. Ivanova, S. A. Nikitin, A. V. Morozkin, I. A. Ovchenkova, A. E. Bogdanov, W.Suski, J. K. Warchulska, A. Gilewski. Journal of Alloys and Compounds, 365, 2004, p. 15-20 4. GdMnGe. . . , . . , . . , . . , . . . . 3. , . 2003 ., N 3, c. 27-30. 5. TbMnX (X=Si, Ge) . . . , . . , . . , . . . XIX - " ", , 2004, -20, . 191 6. DyMn6Ge6 DyMn5oGe6. . . , . . , . . , . . . XVIII - " ", , 2002, -11, . 520 7. Gd1-xLaxMn6Ge6 (x = 0.1, 0.2, 0.3). . . , . . , . . , . . , . . . XVII " ", , 2000, -29, . 220 8. . . , . . , . . , . . , . . , . . . Gd1-xLaxMn6Ge6 (x=0.1, 0.2, 0.3). , N 2, 2002, . 32-33. 9. T. I .Ivanova, S. A. Nikitin, I. A. Ovchenkova, A. E. Bogdanov, A.V. Morozkin, J. K. Warchulska. The magnetic properties and crystal structure of the GdMnGe intermetallic compound. The European Conference PHYSICS OF MAGNETISM'02, ABSTRACTS, P-4-16, p.122 10. A. E. Bogdanov, A. V. Morozkin, T. I. Ivanova, S. A. Nikitin, J. K. Warchulska. The influence of substitutions on the magnetization processes in compounds based on DyMn6Ge6 The European Conference PHYSICS OF MAGNETISM'02, ABSTRACTS, P-4-17, p.123 11. A. E. Bogdanov, A. V. Morozkin, T. I. Ivanova, S. A. Nikitin, J. K. Warchulska. The magnetic behaviour of new compounds based on DyMn6Ge6 Moscow International Symposium on Magnetism, June 20-24, 2002, Book of Abstracts, 24PO11-04, c. 323 12. . . , . . , . . , . . , . . , . . , . . . R-Mn-Ge(Si). III . 25-29 2000 . , . . -2-01, .68. 13. . . , . . , . . , . . , . . . . XVI " 23


". , . 27 1 1999 . . 2-3-01, .59-60. . [1]. V. Klosek, A. Verniere, B. Ouladdiaf, B. Malaman. Crystal and magnetic structures of the R(=Y, Dy-Tm)MnGe compounds. Journal of magnetism and magnetic materials, 2003, 256, 69-92 [2]. J. H. V. J. Brabers, P. Schobinger-Papamantellos, K. H. J. Buschow, F. R. de Boer. The magnetisation process of the ferrimagnetic spiral structure in DyMn6-xCrxGe6 compounds. Journal of Magnetism and Magnetic Materials, 1997, 171, 267-279 [3]. G. Venturini, B. Malaman, E. Ressouche. Neutron diffraction study of the TbMnGe compound. Journal of Alloys and Compounds, 1996, 243, 98-105. [4]. M. T. Kelemen, P. Rüsch, E. Dormann, K. H. J. Buschow. Spiral spin structures of RMn6Ge6 (R=Gd, Tb, Dy). Journal of Magnetism and Magnetic Materials, 223 (2001) 253-260 [5]. . . . . -.: M, 1989, 248 . [6]. P. A. Herpin, P. Meriel. Etude de l^antiferromagnetisme helicoidal de MnAu2 par diffraction de neutrons. Le journal de physique et le radium. Tome 22, Juin 1961, p. 337

24