Poole Ch.P., Jr. Handbook of Superconductivity

216 Chapter 6: Crystal Structures of Classical Superconductors

CeCo3B 2

type,

hP6,

(191)

P6/mmm-gca

substitution derivative of CaCus,

D2 d

branch PrNi2A13

LuOs3B2, T c = 4.67 K, PX

a = 5.455, c = 3.064 A, Z = 1, Fig. 6.11a (Lee

et al.,

1987)

Atom WP x y z

Lu l(a) 0 0 0

1 0 1

Os 3(g) ~

1 2 0

B 2(c) ~

Compound a

a(A) c(A) Tc (K) Ref.

Lair 5 5.399 4.203 2.13 1, 2

Thlr 5 5.315 4.288 3.93 2

UNi2A13 5.207 4.018 1.1 3, 4

UPd2A13 5.365 4.186 2.0 5, 4

LaRh3B 2 5.480 3.137 2.82 6

Lair3 B 2 5.543 3.116 1.65 6

LuOs3B 2 5.457 3.052 4.67 6, 7

ThRu3B 2 5.526 3.070 1.79 6

Thlr3B 2 5.449 3.230 2.09 6

aData for RRu3B 2 (R --- Y, La, Ce-Nd, Sm, Gd-Lu, U), UOs3B2, RRh3B 2 (R --Ce-Nd, Sm-Gd) and

UIr~B~ (T~ ~ 1.2K) reported in

Ku pt al

(1980)', T~- 6.00K reported for

VOs31~ 2

(unknown

structure) in Ku and Shelton (1980).

References: 1, Vorob'ev and Mel'nikova (1974); 2, Geballe

et al.

(1965); 3, Geibel

et al.

(1991b); 4,

Geibel

et al.

(1993); 5, Geibel

et al.

(1991a); 6, Ku

et al.

(1980); 7, Lee

et al.

(1987).

LaRu3Si 2 type,

hP12,

(176)

P63/m-hfb

deformation derivative of CeCo3B 2

LaRuaSi 2, T c = 7.60 K, PX

a = 5.676, c = 7.120 A, Z = 2 (Vandenberg and Barz, 1980; Barz, 1980)

Atom WP x y

La 2(b) 0 0 0

1

Ru 6(h) 0.01 0.490

i 2

0.0

Si 4(f) ~

Compound a a(A) c(A) T c(K) Ref.

YRu3 Si 2 5.543 7.152 3.51 b 1, 2

LaRu3Si 2 5.676 7.120 7.60 b 1", 2

ThRu3 Si 2 5.608 7.201 3.98 b 1, 2

aData for RRu3Si 2 (R = Sc, Ce-Nd, Sm-Lu, U; T c < 1 K) reported in Barz (1980).

bRu-rich sample containing also free Ru.

References: 1, Vandenberg and Barz (1980); 2, Barz (1980).

J. Tabulated Data 217

Mo3AI2C type,

cP24,

(213)P4132-dca

filled-up substitution derivative of/3-Mn, A13

Mo3A12C , T c = 10.0K, PX

a = 6.866 A, Z -- 4 (Jeitschko

et al.,

1963a; Johnston

et al.,

1964)

Atom WP x

1 0.206 0.456

Mo 12(d) g

A1 8(r 0.061 0.061 0.061

C 4(a) 3- 3- 3

8 8 8

MgAI204 type, spinel, Hl l,

cF56,

(227)

Fd3m-ecb

Li0.vsTi204, T c = 13.2K, SX, T -- 223 K, R = 0.0109

a -- 8.4030 A, Z = 8 (Moshopoulou

et aL,

1994)

Atom WP x y z a Occ.

Li 8(b) 3 3- 3

8 8 8

Ti 16(c) 0 0 0

O 32(e) 0.23685 0.23685 0.23685

0.75

aOrigin at center (3m).

Compound a(A)

Tc(K ) Ref.

Li0.75Ti204 8.4030 13.2 1 *

Lil.03 Ti

1.90 04

8.40099 12.3 2"

CuV2S 4

9.82 4.45 3

CuRh2 S 4

9.790 4.35 4, 5*

CuRh2 Se 4 10.263 3.50 4, 5*

References: 1, Moshopoulou

et al.

(1994); 2, Dalton

et al.

(1994); 3, van Maaren

et al.

(1967); 4,

Robbins

et al.

(1967); 5, Riedel

et al.

(1976).

ZrFe4Si 2 type, tP14, (136)

P42/mnm-ifa

ZrNi4P2, SX, R -- 0.028

a = 6.934, c -- 3.565 A, Z -- 2 (Pivan

et al.,

1989)

Atom WP x

y z

Zr 2(a) 0

Ni 8(i) 0.1648

P 4(f) 0.2819

0 0

0.5851 0

0.2819 0

Compound a(A) c(A) T c (K) Ref.

ZrNi4P 2 6.944 3.576 <2 1, 2*

ZrRu4P 2 6.992 3.699 11 1

HfRu4P 2 ...... 9.5 1

References: 1, Shirotani

et al.

(1997); 2, Pivan

et al.

(1989).

218

Chapter 6: Crystal Structures of Classical Superconductors

4. AB3C n

Types (n > 3)

W3Fe3C type, q-carbide, E93, cF112, (227) Fd3m-fedc

filled-up derivative of NiCd and Ti2Ni

Zr 3V 3 O, T c -- 7.5 K, PN

a = 12.1703 A, Z -- 16 (Rotella et al., 1983" Matthias et al., 1963)

Atom WP x y

g a

1

Zr 48(f) 0.43541

V(1) 32(e) 0.2078 0.2078

V(2) 16(c) 0 0

1 1

0 16(d) i

1

8

0.2078

0

1

2

aOrigin at center (3m).

Compound a(A) Tc(K )

Ref.

Ti2Co 11.30 3.44

Tio.573 Rho.287Oo.14 11.588 3.37

Tio.573 Iro.287Oo.14 11.620 5.5

Zr3V30 12.160 7.5

Zro.61

Rh0.285

O0.105 12.408 11.8

Zro.65 Iro.265 00.085 12.430 2.30

Zro.61 Pdo.285 0O.lO 5 12.470 2.09

1, 2*

1

References: 1, Matthias et al. (1963); 2, Rotella et al. (1983).

HfsSn3Cu type, Nowotny phase, hP18, (193) P63/mcm-g2db

filled-up derivative of MnsSi 3, D88

Mo4.8Si3Co.6, T c = 7.6 K, PN, R B = 0.04

a = 7.286, c = 5.046 A, Z = 2 (Parth6 et al. 1965; Sadagapan and Gatos, 1966)

Atom WP x y z Occ.

1

Mo(1) 6(g) 0.240 0

1 2 0

0.9

Mo(2) 4(d) ~

1

Si 6(g) 0.60 0

C 2(b) 0 0 0 0.6

Compound a(A) c(A) T c(K) Ref.

ZrsGa 3 8.020 5.678 3.8 1, 2

Mo4.8 Si3Co. 6 7.286 5.046 7.6 3*, 4

Nbo.511ro.3o Oo.

19 a

7.869 5.094 11.0 5

aNominal composition of sample.

References: 1, Boller and Parth6 (1963); 2, Chapnik (1985); 3, Parth6 et al. (1965); 4, Sad'agapan and

Gatos (1966); 5, Horyn et al. (1978).

J. Tabulated Data 219

5. AB4C n

Types (n > 4)

CeCo4B4 type,

tP18,

(137)

P42/nmc-g2b

ErRh4B4, T c = 8.55 K, SX, T = 290 K, R = 0.049

a -- 5.292, c -- 7.379 A, Z -- 2, Fig. 6.19a (Watanabe

et al.,

1984; Matthias

et al.,

1977)

Atom WP

x y

Z a

3 1 1

Er 2(b) ~ ~

1 0.5011 0.3953

Rh 8(g)

1 0.0772 0.0971

B 8(g)

aOrigin at 1.

Compound a a(A) c(A)

Tc(K ) Ref.

Sc0.65Th0.35Rh4B4 5.317 7.422 8.74 b 1, 2

YRh4B 4 5.308 7.403 11.34 1", 2, 3*

NdRhaB 4 5.333 7.468 5.36 1, 2

SmRh4B 4 5.312 7.430 2.51 1, 2, 3*

GdRh4B 4 5.309 7.417 ...

1

TbRh4B 4 5.303 7.404 ... 1

DyRhaB 4 5.302 7.395 ... 1

DyRh2Ir2B 4 ...... 4.64 4

HoRhaB 4 5.293 7.379 ... 1

HoRh2Ir2B 4 ...... 6.41 4

ErRhaB 4 5.292 7.374 8.55 1, 5", 2

TmRhaB 4 5.287 7.359 9.86 1, 2

LuRh4B 4 5.294 7.359 11.76 1, 2

LU0.v5Th0.25Rh4B4 ......

11.93 2

ThRhnB 4 5.356 7.538 4.34 1, 2, 3*

Y0.5 Luo.5 IraB4 5.408 7.280 3.21 4

Hol.llr4B3.6 ...... 2.12 4

ErlraB 4 5.408 7.278 2.34 4

Tmlr4B 4 5.404 7.281 1.75 4

aData for RCo4B 4 (R = Y, Ce, Gd-Tm, Lu) reported in Kuz'ma and Bilonizhko (1972").

bFor composition Sc0.75Th0.25RhaB4 .

References: 1, Vandenberg and Matthias (1977); 2, Matthias

et al.

(1977); 3, Yvon and Grfitmer

(1980); 4, Ku

et aL

(1979b); 5, Watanabe

et al.

(1984).

220

Chapter 6: Crystal Structures of Classical Superconductors

LuRh4B 4 type, oS108, (68)

Ccca-i6fa

LuRh4B4, T c = 6.2 K, SX, R = 0.05

a--7.410, b = 22.26, c = 7.440A, Z = 12, Fig. 6.19c (Yvon and Johnston, 1982; Johnston and

Braun, 1982)

Atom WP x y

g a

1

Lu(1) 8(f) 0 0.5824

1 1

Lu(2) 4(a) 0 ~

Rh(1) 16(i) 0.1180 0.0417 0.0955

Rh(2) 16(i) 0.1530 0.1245 0.3670

Rh(3) 16(i) 0.3531 0.2065 0.1272

B(1) 16(/) 0.13 0.147 0.07

B(2) 16(i) 0.19 0.023 0.40

B(3) 16(i) 0.36 0.318 0.09

aOrigin at 1.

Compound a(A) b(A) c(A)

Tc(K ) Ref.

ErRh4B 4 7.444 22.30 7.465 4.3 1, 2

TmRh4B 4 7.432 22.28 7.455 5.4 1, 2

YbRh4B 4 7.424 22.26 7.458 n.o. 1, 2

LuRh4B 4 7.410 22.26 7.440 6.2 1", 2

References: 1, Yvon and Johnston (1982); 2, Johnston and Braun (1982).

LuRu4B 4 type, t/72, (142)

I41/acd-g2b

LuRu4B4, T c -- 2.06 K, PX, R e = 0.065

a -- 7.419, c -- 14.955 A, Z = 8, Fig. 6.19b (Johnston, 1977; Ku

et al.,

1979a)

Atom WP x

1

Lu 8(b) 0

Ru 32(g) 0.350 0.138

B 32(g) 0.139 0.068

1

8

0.1875

0.289

aOrigin at 1.

Compound a a(A)

c(A)

Tr

Ref.

ScRu4B 4 7.346 14.895

YRu4B 4 7.454 14.994

LuRu 4 B 4 7.419 14.955

ThRu4 B 4 7.540 15.143

URu 4B 4 7.459 14.986

UOs4B 4 7.512 15.053

7.23

1.4

2.06

<1.5

1

2,1,3"

2*, 1

2

4*

YRh4B4 ...... 10 2

Y(Rh0.85Ruo.15)4B 4 7.484 14.895 9.56 2, 5", 3*

Pr(Rh0.85 Ru0.15)4 B 4 7.543 14.995 2.41 2

(continued)

J. Tabulated Data 221

Nd(Rho.85 Ruo.15

)4

B4 7.537 14.969 < 1.5 2

Sm(Rho.85 Ruo.

15 )4

B4 7.516 14.945 < 1.5 2

Eu(Rho.85 Ruo.

15 )4 B4

7.505 14.932 2.0 2

Gd(Rho.85 Ruo.

15

)4 B4 7.502 14.916 < 1.5 2

Tb(Rho.85 Ruo.15)4B 4 7.490 14.898 < 1.5 2

Dy(Rho.85 RUo.15)aB 4 7.479 14.885 4.08 2

Ho(Rho.85 RUo. 15)4 B 4 7.476 14.872 6.45 2

ErRh4B 4 7.461 14.804 7.80 6", 7

Er(Rho.85 Ruo.15 )4 B4 7.468 14.862 8.02 2

Tm(Rho.85Ruo.15)4B 4 7.458 14.853 8.38 2

Yb(Rho.85 Ruo. 15)4B 4 7.449 14.851 < 1.5 2

Lu(Rho.85 RUo. 15)4 B 4 7.445 14.837 9.16 2

~Data for RRu4B 4 (R =Ce-Nd, Sm-Yb; T c < 1.5 K for R = Ce, Pr, Sm, Eu, Tm, Yb) reported in

Johnston (1977).

References: 1, Ku et aL (1979a); 2, Johnston (1977); 3, Shelton et al. (1983); 4, Rogl (1980); 5, Yvon

and Grfittner (1980); 6, Watanabe et al. (1986); 7, Iwasaki et al. (1986).

LaFe4P12 type, ci34, (204) Im3-gca

filled-up derivative of CoAs3, skutterudite, D02

LaFe4P12, T c --- 4.08 K, SX, R -= 0.028

a = 7.8316A, Z = 2 (Jeitschko and Braun, 1977; Meisner, 1981)

Atom WP x

La 2(a) 0 0 0

1 1 1

Fe 8(c) ~ ~

P 24(g) 0 0.1504 0.3539

Compound a a(A) T~(K)

Ref.

LaFe4P12 7.8316 4.08

CeFe4P12 7.7920 <0.35

PrFe4P12 7.8149 <0.35

NdFe4Pl2 7.8079 <1.0

SmFe4P12 7.8029 ...

EuFe4P12 7.8055 ...

LaRu4 P 12 8.0561 7.20

CeRu4P12 8.0376 <0.35

PrRu4P12 8.0420 <0.35

NdRu4P12 8.0364 <1.0

EuRu4Pl2 8.0406 ...

1", 2

1,2

1

1,2

1

aData for ROs4P12 (R = La, Ce-Nd) reported in Jeitschko and Braun (1977).

References: 1, Jeitschko and Braun (1977); 2, Meisner (1981).

222

Chapter 6: Crystal Structures of Classical Superconductors

6. AxB6C8Types

LT-BaMo6S s type, Chevrel phase, aP15, (2)

Pl-iTa

BaMo6S 8, SX, T = 173 K, R -- 0.070

a = 6.5896, b = 6.6500, c = 6.6899 A, ~ = 88.731, /~ = 88.818, y-- 88.059 ~ Z = 1 (Kubel and

Yvon, 1990)

Atom WP x y z

Ba

l(a) 0 0 0

Mo(1) 2(i) 0.23750 0.56443 0.41916

Mo(2) 2(i) 0.41765 0.23305 0.56528

Mo(3) 2(i) 0.56678 0.41669 0.23264

S(1) 2(0 0.1240 0.3924 0.7369

S(2) 2(i) 0.2556 0.2469 0.2524

S(3) 2(/) 0.3915 0.7359 0.1247

S(4) 2(i) 0.7376 0.1224 0.3878

For a list of triclinic Chevrel phases, see LT-Ni0.66Mo6Se 8.

For superconducting transition temperatures of Chevrel phases, see HT-Pb0.9Mo6S 8.

HT-Ni2.sMo6S s type, Chevrel phase, hR78, (148)

R3-f 4c

Cu2.76Mo6S8, T c = 10.9 K a, SX, R = 0.03

a = 9.713, c = 10.213 A, Z = 3 (Yvon

et al.,

1977; Fliikiger

et al.,

1977)

Atom WP x y z Occ.

Cu(1) 18(f) 0.15378 0.05862 0.00161

Cu(2) 18(f) 0.23611 0.14694 0.10334

Mo 18(f) 0.15080 0.16564 0.39103

S(1) 18(f) 0.05620 0.35913 0.07637

S(2) 6(c) 0 0 0.20195

0.24

0.22

aFor sample containing two LT modifications.

For a list of rhombohedral Chevrel phases and superconducting transition temperatures, see

HT-Pb0.9Mo6 S 8 .

LT-Nio.66Mo6Se 8 type, Chevrel phase, aP16, (2)

Pl-i 8

CUl.84Mo688, T c = 10.8 K, SX, T = 250 K, R = 0.08

a = 6.479, b = 6.559, c = 6.569A, ~ = 96.89,/~ = 95.74, ~, = 93.44 ~ Z = 1 (Yvon

et al.,

1979;

Fliikiger

et al.,

1977)

Atom WP x y z Occ.

Cu 2(i) 0.3407 0.0912 0.0576

Mo(1) 2(i) 0.0442 0.4013 0.2194

Mo(2) 2(i) 0.0943 0.7792 0.4629

Mo(3) 2(i) 0.2796 0.4567 0.5936

S(1) 2(i) 0.1266 0.2845 0.8595

S(2) 2(i) 0.2282 0.1261 0.3828

S(3) 2(i) 0.3627 0.6186 0.2826

S(4) 2(i) 0.7044 0.1995 0.1958

0.92

(continued)

]. Tabulated Data 223

Compound T(K)

Wyckoff a(A) b(A) c(A)

sequence c~(~ tiC) 7(~

Ref.

CaMo6S 8 27

SrMo6S 8 20

i7a

BaMo6S 8 19

iTa

EuMo6S 8 40

i7a

Crl.73Mo6S 8 RT i 8

Fe2Mo6S 8 RT i s

CUl.84Mo6S8 a 250 i s

AgMo6 S 8 140 i 7 a

InMo6S 8 100

PbMo6S 8 10

6.4912 6.4977 6.5060 1

89.461 89.555 88.393

6.481 6.572 6.611 2*

89.246 89.304 88.169

6.6976 6.6545 6.5685 3", 4*

87.929 88.978 88.887

6.4692 6.5651 6.5986 4*

89.179 89.184 88.009

6.522 6.497 6.449 5*

94.68 90.70 97.91

6.502 6.466 6.481 6*

95.94 97.37 91.33

6.479 6.569 6.559 7*

96.89 93.44 95.74

6.4592 6.4469 6.4590 8*

91.77 91.57 91.72

6.492 6.534 6.500 9

93.55 91.34 94.40

6.5759 6.5383 6.4948 10

88.516 89.604 89.298

Li4Mo6Ses b RT

Til.2Mo6Se 8 RT

V1.2Mo6Se 8 RT

Crl.2Mo6Se 8 RT

Mnl.2Mo6Se 8 RT

Fel.2Mo6Se8 RT

Ni0.66Mo6Se8 c RT i 8

6.908 6.938 6.980 11

95.828 91.645 96.794

6.69 6.79 6.76 12

91.22 98.52 94.21

6.73 6.75 6.69 12

91.56 98.12 94.29

6.75 6.75 6.70 12

92.20 98.02 94.17

6.82 6.67 6.74 12

92.21 97.01 91.57

6.80 6.66 6.66 12

91.08 96.03 93.19

6.727 6.582 6.751 13"

90.61 92.17 90.98

Ni0.85 Mo6Te8 RT i 8 7.028 7.100 7.102 14*

91.23 95.73 90.82

aHomogeneity range CuxMo6S8, 1.75 < x < 1.85 (9.9 < T c < 11.0 K), two other LT modifications

(unknown structure) were observed for x = 1.2 (T c = 5.6 K) and 3.1 < x < 3.3 (6.4 < T c < 4.0 K);

two LT modifications (unknown structures) are reported for CuxMo6Se 8 at x "~ 1.7 (T c = 5.7) and

x ~ 2.5 (T c = 2.0 K) (Flfikiger and Baillif, 1982).

bHomogeneity range LixMo6Se 8, 3.6 < x < 4 at room temperature, a second triclinic single-phase

region was observed for 2.5 < x < 2.6; LixMo6S 8 is reported to be triclinic for x > 3.95 at rooom

temperature (McKinnon and Dahn, 1985).

CHomogeneity range NixMo6Se 8, 0.6 < x < 1.2 (Sergent and Chevrel, 1973).

References: 1, Kubel and Yvon (1989); 2, Koppelhuber-Bitschnau

et aL

(1990); 3, Jorgensen and

Hinks (1986); 4, Kubel and Yvon (1990); 5, Harbrecht and Mahne (1992); 6, Yvon

et aL

(1980); 7,

Yvon

et al.

(1979); 8, Shamrai

et al.

(1990); 9, Tarascon

et al.

(1984b); 10, Jorgensen

et al.

(1987); 11,

Dahn

et aL

(1985); 12, Sergent and Chevrel (1973); 13, Bars

et al.

(1973b); 14, H6nle and Yvon

(1987).

For superconducting transition temperatures of Chevrel phases see HT-Pb0.9Mo6S8 .

224

Chapter 6: Crystal Structures of Classical Superconductors

HT-Pb0.9M%S 8 type, Chevrel phase, hR45, (148)

R3-f2ca

Pb0.92Mo6S8, T c : 15.2 K a, SX, R = 0.057

a = 9.212, c -- 11.437 A, Z = 3, Fig. 6.25 (Guillevic

et al.,

1976b; Marezio

et al.,

1973)

Atom WP x y z Occ.

Pb 3(a) 0 0 0

Mo 18(f) 0.16015 0.17456 0.40182

S(1) 18(f) 0.04182 0.34136 0.08347

S(2) 6(c) 0 0 0.24363

0.92

aHighest reported value.

For a structure with off-centered cations, see HT-Ni2.sMo6S 8.

For structures of triclinic Chevrel phases, see LT-BaMo6S 8 and LT-Ni0.66Mo6Se 8.

Compound Wyckoff sequence a(A) c(A) Tc(K )

Ref.

LiMo 6S8 a f3c 9.308 10.757 5.5

NaMo6 S 8 9.231 11.321 8.6 b

KMo6S 8 9.24 11.57 ...

MgMo6S 7 9.490 10.550 3.5

CaMo6S 8

f2ca

9.1832 11.3561 6 c

SrMo6S 8

f2ca

9.2000 11.5645 ...a

BaMo6S 8

f2ca

9.2881 11.8004 ...e

ScMo6S 8 ...... 3.6

Y1.2Mo6S8 9.08 11.25 2.10 c

LaMo6S 8

fZca

9.120 11.554 6.95

CeMo 6 S 8 9.10 11.45 < 1.1

PrMo6 S 8 9.10 11.44 2.55

NdMo6S 8 9.10 11.42 3.5

Sml.2Mo6S 8 9.09 11.37 2.4

EuMo6S 8

fZca

9.1801 11.5635 <1.1 g

GdMo6 S 8

f2 ca

9.071 11.349 1.4

Tbl.zMo6S 8 9.09 11.30 1.4

DYl.zMo6S 8 9.09 11.27 1.7

HoMo6S 8

fZca

9.0674 11.2933 1.91

ErMo6 S 8

f2ca

9.071 11.271 < 1.1

Tml.2Mo6S 8 9.10 11.20 1.95

YbMo6S 8

fZca

9.1509 11.3917 8.6

Lul.2Mo6S8 9.08 11.15 1.95

Thl.zMo6S 8 9.05 11.37 n.o.

U1.2Mo6S8 9.05 11.32 n.o.

NbMo6S 8 9.08 11.34 n.o.

MnMo6S 7 9.480 10.522 ...

Fel.32Mo6 S 8 f4 c 9.563 10.273 ...

COl.60Mo688

f4c

9.581 10.143 ...

Nil.a0Mo6 S 8 f4 c 9.478 10.210 ...

Pdl.6Mo6S 8 9.30 10.68 . .

CUl.73Mo688

f4c

9.524 10.336 i0.9 h

Cu3.66Mo6 $8

fac

9.773 10.255 6.4

AgMo6 S 8

f2 ca

9.308 10.873 9.5

Zn 2Mo 6S 8 9.533 10.282 3.6

CdM%S 8 9.440 10.720 3.5

1, 2*, 3*

4,5

6

7,8

9*, 10

11", 12"

12", 13"

8

14

15", 14

14

12", 16", 14

15", 14

14

17", 15"

15", 14

14

18", 14

14

19

20

7

21"

5

22", 8

23", 5

24*

25

7,8

(continued)

~~

...%

~ 8 Ii

~~~~

0

~ $ ~-~ ~

.,.....,

~

~..,.

~~ ~. ~ - ~ ~ ~ ~ _ ~ - _

.~ ..~ ~.o,:::,-

,.- i..o i,o ,-.,

9 9 &A

A A-. " " " 8A.- A = =

t..~ '.~~ I'~ t..t, 0',, ~,~~ 0',, 0',, 0',, t.t, ~~ ',.~ ~.--, 0"~ Oe ',,.O ,.--' ,.--' 0", ~ I~ t~ 4~ OO 0 0 0 Oo

~ ~ b., b~ b',, i..~ be i.~ ,.-, ,-.., -..a -..a b,., ,-- oo i'~ ,-.-, " ~ ~ ~ i,~ ~ a',, ,.-.-,

t,..t,

r

Poole Ch.P., Jr. Handbook of Superconductivity

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