Supporting Information-2
Supporting Information for
New-Structure-Type Fe-based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs)
Akira Iyo1,*, Kenji Kawashima1,2, Tatsuya Kinjo1,3, Taichiro Nishio1,3, Shigeyuki Ishida1, Hiroshi Fujihisa1, Yoshito Gotoh1, Kunihiro Kihou1, Hiroshi Eisaki1, Yoshiyuki Yoshida1 1
National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono,
Tsukuba, Ibaraki 305-8568, Japan 2
IMRA Material R&D Co., Ltd., 2-1 Asahi-machi, Kariya, Aichi 448-0032, Japan
3
Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo
162-8601, Japan *
E-mail: [email protected]
Phone: +81-29-861-5435. Fax: +81-29-861-5569.
S-1
0 10 20 30 40 2θ (deg) 50
S-2 60 215 220 118
200
112
(Ca0.5Na0.5)Fe2As2 (I4/mmm)
211 116 213 008
202
105
110
101
114
002
103 112
70
208
116 213
220 118
117 108 215
204
202
114 200 115
113 105
110
101 102 004
001
103
002
200
112 113 006 105 114
110 005
102
003 100
002
303 218
203 116 212 213 117 108 009 215 118 220 207
Intensity (arb. units)
115
103
(a) CuKα1
AFe2As2
CaCsFe4As4 (P4/mmm)
CaKFe4As4 (P4/mmm)
80
CuKα1
(b) 103
AFe2As2
208 303 218
213 117 108 009 215 118 109 220
116
008 204
200 115 106
112 113 006 105 114
SrCsFe4As4 (P4/mmm)
208 303 312
109 220
116 212 213 117 108 009 215
200 115
112 113 006 105 114
SrRbFe4As4 (P4/mmm)
0
10
20
30
40 50 2θ (deg)
70
208 303 312
215
60
220
213
(Sr0.5K0.5)Fe2As2 (I4/mmm)
008
116
200 202
114 105
110
004
101
002
112
103
001
004
110
002
103
110
102004
101
003
Intensity (arb. units)
001
002
SrFe2As2
80
Figure S1 Powder XRD patterns of (a) CaAFe4As4 for A = K or Cs and (b) SrAFe4As4 for A = Rb or Cs, together with those of (Ca0.5Na0.5)Fe2As2 and (Sr0.5K0.5)Fe2As2 for comparison, respectively. The (Ca0.5Na0.5)Fe2As2 and (Sr0.5K0.5)Fe2As2 peaks are indexed based on a body-centered structure (I4/mmm). The CaAFe4As4 and SrAFe4As4 peaks are indexed based on a primitive tetragonal structure (P4/mmm). Diffraction peaks hkl that are forbidden for I4/mmm (odd number values of h+k+l ) appear for CaAFe4As4 and SrAFe4As4.
S-3
Intensity (arb. units)
3
4πM/H (emu/cm )
Nominal composition: 0.2 Ca1.5K0.5Fe4As4
CaKFe4As4 CaFe2As2
0.0 -0.2 -0.4 -0.6 -0.8
0
5 10 15 20 25 30 35 40
T (K)
0
10
20
30
40 50 2θ (deg)
60
70
80
Figure S2 XRD pattern of sample with nominal composition of Ca1.5K0.5Fe4As4. Inset: Temperature (T) dependence of magnetization divided by the applied field, M/H, of the sample. The peaks attributed to CaKFe4As4 and CaFe2As2 are indicated by open and closed circles, respectively.
S-4
3
4πM/H (emu/cm )
0.05
Intensity (arb. units)
CsFe2As2 BaFe2As2 X
(Ba,Cs)122 or BaCs1144
0.00 -0.05 -0.10 -0.15 0
5 10 15 20 25 30 35
T (K)
103 X 002 X
0
10
004 X
20
200 X 105 X
30
116 X
40 50 2θ (deg)
220 X
60
70
80
Figure S3 XRD pattern of sample with nominal composition of BaCsFe4As4, which was obtained by heating at 900°C. The sample exhibits superconductivity at 26 K, as shown in the inset. This sample contains a superconducting (Ba,Cs)122 or BaCs1144 phase, as indicated by the “X”, in addition to non-superconducting (above 5 K) Ba122 and Cs122 phases.
S-5
New-Structure-Type Fe-based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs)
Akira Iyo1,*, Kenji Kawashima1,2, Tatsuya Kinjo1,3, Taichiro Nishio1,3, Shigeyuki Ishida1, Hiroshi Fujihisa1, Yoshito Gotoh1, Kunihiro Kihou1, Hiroshi Eisaki1, Yoshiyuki Yoshida1 1
National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono,
Tsukuba, Ibaraki 305-8568, Japan 2
IMRA Material R&D Co., Ltd., 2-1 Asahi-machi, Kariya, Aichi 448-0032, Japan
3
Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo
162-8601, Japan *
E-mail: [email protected]
Phone: +81-29-861-5435. Fax: +81-29-861-5569.
S-1
0 10 20 30 40 2θ (deg) 50
S-2 60 215 220 118
200
112
(Ca0.5Na0.5)Fe2As2 (I4/mmm)
211 116 213 008
202
105
110
101
114
002
103 112
70
208
116 213
220 118
117 108 215
204
202
114 200 115
113 105
110
101 102 004
001
103
002
200
112 113 006 105 114
110 005
102
003 100
002
303 218
203 116 212 213 117 108 009 215 118 220 207
Intensity (arb. units)
115
103
(a) CuKα1
AFe2As2
CaCsFe4As4 (P4/mmm)
CaKFe4As4 (P4/mmm)
80
CuKα1
(b) 103
AFe2As2
208 303 218
213 117 108 009 215 118 109 220
116
008 204
200 115 106
112 113 006 105 114
SrCsFe4As4 (P4/mmm)
208 303 312
109 220
116 212 213 117 108 009 215
200 115
112 113 006 105 114
SrRbFe4As4 (P4/mmm)
0
10
20
30
40 50 2θ (deg)
70
208 303 312
215
60
220
213
(Sr0.5K0.5)Fe2As2 (I4/mmm)
008
116
200 202
114 105
110
004
101
002
112
103
001
004
110
002
103
110
102004
101
003
Intensity (arb. units)
001
002
SrFe2As2
80
Figure S1 Powder XRD patterns of (a) CaAFe4As4 for A = K or Cs and (b) SrAFe4As4 for A = Rb or Cs, together with those of (Ca0.5Na0.5)Fe2As2 and (Sr0.5K0.5)Fe2As2 for comparison, respectively. The (Ca0.5Na0.5)Fe2As2 and (Sr0.5K0.5)Fe2As2 peaks are indexed based on a body-centered structure (I4/mmm). The CaAFe4As4 and SrAFe4As4 peaks are indexed based on a primitive tetragonal structure (P4/mmm). Diffraction peaks hkl that are forbidden for I4/mmm (odd number values of h+k+l ) appear for CaAFe4As4 and SrAFe4As4.
S-3
Intensity (arb. units)
3
4πM/H (emu/cm )
Nominal composition: 0.2 Ca1.5K0.5Fe4As4
CaKFe4As4 CaFe2As2
0.0 -0.2 -0.4 -0.6 -0.8
0
5 10 15 20 25 30 35 40
T (K)
0
10
20
30
40 50 2θ (deg)
60
70
80
Figure S2 XRD pattern of sample with nominal composition of Ca1.5K0.5Fe4As4. Inset: Temperature (T) dependence of magnetization divided by the applied field, M/H, of the sample. The peaks attributed to CaKFe4As4 and CaFe2As2 are indicated by open and closed circles, respectively.
S-4
3
4πM/H (emu/cm )
0.05
Intensity (arb. units)
CsFe2As2 BaFe2As2 X
(Ba,Cs)122 or BaCs1144
0.00 -0.05 -0.10 -0.15 0
5 10 15 20 25 30 35
T (K)
103 X 002 X
0
10
004 X
20
200 X 105 X
30
116 X
40 50 2θ (deg)
220 X
60
70
80
Figure S3 XRD pattern of sample with nominal composition of BaCsFe4As4, which was obtained by heating at 900°C. The sample exhibits superconductivity at 26 K, as shown in the inset. This sample contains a superconducting (Ba,Cs)122 or BaCs1144 phase, as indicated by the “X”, in addition to non-superconducting (above 5 K) Ba122 and Cs122 phases.
S-5
