C 3 C-1 Ru 2 x Fe x CrSi A A, A, A, A, A Ru 2 x Fe x CrSi 1).3 x 1.8 2) Ru 2 x Fe x CrSi/Pb BTK P Z 3 x = 1.7 Pb BTK P =.52 1) S.Mizutani, S.Ishida, S.Fujii and S.Asano, Mater. Tran. 47(26)25. 2) M.Hiroi, K.Matsuda, and T.Rokkaku, Phys.Rev.B 76,13241 (27) 1.4 1.2 1..8.6-1 -5 5 1 16
C-2 CoTiSb A A, A, A, A C1 b CoTiSb Ti Mn CoTi 1 x Mn x Sb x.1 x.25.2.15.1.5. 5 1 15 2 25 3 C-3 FeCr 2 S 4 A, B A, A, A, A, A, A, B FeCr 2 S 4 T N = 166K Fe 2+ (JT) T o = 9K JT [1] JT 4 < B < 18T T < T o, B > 6T FeCr 2 S 4 [1] F. K. Lotgering, A. M. van Diepen, and J. F. Olijhoek, Soild State Commun. 17, 1149 (1975) 17
C-4 FeCr 2 Se 4 A A, A, A, A, A, A FeCr 2 S 4 FeCr 2 S 4 S Se FeCr 2 Se 4 [1]C.F.Goya,V.Sagredo,Solid State Commun.125 (23)247. FeCr 2 S 4 FeCr 2 Se 4 FeCr 2 Se 4 M T=21K 1K M Goya [1] (FC) (ZFC) C-5 Mn2YZ(Y=Mn, Cr; Z=3B,4B,5B) A, B, C A, B, C A, Mn-Cr-Z Z=3B,4B,5B DOS [1] S. Fujii et al; J.Phys. Soc. Jpn. 77 (28) 7472-1. [2] WIEN2k,http://www.wien2k.at/ TD O S [states / f.u. spin ev ] TD O S [states / f.u. spin ev ] 8 6 4 2 Mn 2 MnSi Up down -8-6 -4-2 2 8 6 4 2 Mn 2 MnP Up Down E-EF [ev] -8-6 -4-2 2 E-E F [ev] 18
C-6 Co2MnSi TMR A, B, C, D, E A, A,E, A,B, C, C, D, D Co 2 MnSi (CMS) Heusler (MTJ) (TMR) Fe/Cr (GMR) [1] TMR CMS/Al-O/CMS MTJ TMR Fig. 1 CMS/Al-O/CMS MTJ TMR curve (R AP ) CMS [1] K. Suenaga, et al., Phys. Rev. Lett. 98 (27) 2722. R (Ω) 35 3 25 2 15 1 Co 2 MnSi(3)/Al-(13)/Co 2 MnSi(1) T = 4.2 K ambient.2 GPa 1.25 GPa -.2 -.1.1.2 Magnetic Field (T) 2 15 1 Fig. 1 TMR curve at 4.2 K for a CMS/Al-O/CMS MTJ at high pressure. 5 TMR (%) C-7 Mn Fe 2 P A A, A, A MnFeP 1 x Ge x (x=.15,.17) [1] Ge.2 3K x=.17 28K P,Ge Mn,Fe Mn x Fe 2 x P.8 Ge.2 x=.95,1.,1.5 x=.95,1. x=1.5 [1]Hisato Yabuta et al., J.Phys.Soc.Jpn.75(26)11377 19
C-8 SQUID f = 14 khz A A, A, A, A, A SQUID(Superconducting Quantum Interference Device) MPMS PPMS.1 Hz 1 khz MPMS, f 1 khz MPMS ( 24 bit 2 khz A/D ) 14 khz (H ac.2 Oe f 1 khz) Ho C-9 Co(S,Se) 2 A A, A, A Co(S,Se) 2 S Se 5 CoS 2 Co(S,Se) 2 CoS 2 S Se M(emu/g) -ΔS(J/kgK) 35 3 25 2 15 1 5 1.2GPa.8GPa 8 9 1 11 12 13 14 15 5 4 3 2 1 Temperature (K) H=1T GPa.4GPa 図 1 CoS2 の高圧下高圧下でのでの磁化温度曲線 H=-2T 1.2GPa.8GPa.4GPa GPa 8 9 1 11 12 13 14 15 Temperature(K) 図 2 CoS2 の高圧下高圧下でのでの磁気熱量効果 2
C-1 SBA-15 A, B A, A, A, B, A, A, A 3 P =.8 GPa Meier [1] SBA-15( 8 nm) SBA-15 P = 1.5 GPa P = 1.5 GPa T = 14 K β γ [1] R. J. Meier et al., J. Phys. C : Solid State Phys. 15 (1982) 115. C-11 Cu 2 (OH) 3 Cl A, B B A, A, A, B, Cu 2 (OH) 3 Cl:clinoatacamite S=1/2 Heisenberg SR T N1 =18K T N2 =6.5K T N2 1 clinoatacamite C (J/K mol) 2 15 1 5 H = T H =.5T H = 1T H = 2T H = 3T H = 5T 2 3 4 5 6 7 8 9 1 T (K) 図 1 clinoatacamite 比熱磁場依存性 21
C-12 Ni A, B B A, A, A, A, (MCBJ ) STM Au,Ag,Cu I/V = NG (N =1,2,3,G =12.86 1 ) G MCBJ 4.2K 4.2K Ni ピエゾ電圧印印加 C-13 II A A, A Co 2 Cl(OH) 3 Co 2 Cl(OH) 3 X.G.Cheng SR H.Kubo NMR 256 1 7 z 2in 1out z 2 22
C-14 A A, A, A, A, A GPa SQUID (QD MPMS) DAC MPMS-DAC MPMS-DAC MPMS SQUID XMCD 25 GPa CoFe 2 O 4 1 C-15 CuCrZrS 4 A, B A, A, A, A, B CuCrZrS 4 T c T c 18T CuCrZrS 4 T c T c T c 23
C-16 Ru 1.9 Fe.1 CrSi A, B A, A, A, A, A, B, B Ru 2 x Fe x CrSi 1) Ru 2 x Fe x CrSi X Ru 1.9 Fe.1 CrSi 8GPa 1) S.Mizutani, S.Ishida, S.Fujii and S.Asano, Mater. Tran. 47(26)25. ρ(arb.units).11.1.9.8.7.6.5 5 1 15 2 Temp(K) 2GPa 8GPa 25 3 C-17 Ru 1.9 Fe.1 CrSi µsr A, B A, A, A, B, B, B, B Ru 1.9 Fe.1 CrSi 3K ZF-µSR LF-µSR ZF-µSR A(t)=A 1 exp(-λ 1 t)+a 2 exp(- λ 2 t)(λ 1 > λ 2 ) T 15K LF-µSR T=.26K H LF 13Oe T 15K Normalized Asymmetry.6.4.2 Ru 1.9 Fe.1 CrSi ZF- SR 3K 4.3K 2K 16K 2 4 6 8 t ( s) 24
C-18 DMACuCl 3 A, B, RIKEN C A, A, A, A, A, B, C DMACuCl 3 ( DMA = (CH 3 ) 2 NH 2 ) 2T < H < 3.5T ( A) [1,2] ( B, C) 1 single crystal T ( K ) 2 sample A sample B 1.5 sample C 1.5 2 4 6 8 1 H ( T ) 図 1. 温度 - 磁場相図 C-19 LaMnO 3 A, B A, A, A, A, B, A, A LaMnO 3 LaMnO 3 A-type 8 SBA-15 1 25
C-2 Cs 2 Cu 3 P 4 O 14 A, B, C A, C, C, C A, B, A, ( ) Cs 2 Cu 3 P 4 O 14 Cu 2+ (T) ( ) 2K 1K 2K 1K C-21 Na 2 Cu 3 (GeO 3 ) 4 A, B, C A, B, B, B, C, C, C Na 2 Cu 3 (GeO 3 ) 4 Cu 2+ (S= 1/2) Na 2 Cu 3 (GeO 3 ) 4 (χ) (χ 1 ) χ 1 (T) 8K χ(t) 1K ( ) χ (emu/mol).2 4 3.15 2.1 1 5 1 15 2 25 3.5 T (K) H = 1T. 5 1 15 2 25 3 χ -1 (mol/emu) T (K) 26