1 / 16

Design and development of multi-functional conductors

Constant Resistivity State (CRS) below T c in l -(BETS) 2 Fe x Ga 1-x Cl 4. H. Kobayashi, H. Cui, K. Takahashi, A. Kobayashi. Development of Multi-functional Magnetic Molecular Conductors. Design and development of multi-functional conductors

khanh
Download Presentation

Design and development of multi-functional conductors

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Constant Resistivity State (CRS) below Tc in l-(BETS)2FexGa1-xCl4 H. Kobayashi, H. Cui, K. Takahashi, A. Kobayashi Development of Multi-functional Magnetic Molecular Conductors Design and development of multi-functional conductors by assembling building blocks with different characters Synergy of building brocks with different functions s Magnetic superconductors exhibiting unprecedentedelectro-magnetic properties l-, k-(BETS)2FeX4 Photo-controllable magnetic conductor k-(BETS)2Fe(ox)Cl2 hn c [Fe(qsal)2][Ni(dmit)2]n Conductors based on p donors with stable org. radical parts (TTP-Proxyl)2FeCl4

  2. New Molecular Conductor Exhibiting Photo-Controled Spin-Crossover Transition K. Takahashi [Fe(qsal)2] [Ni(dmit)2]3 n (n=1, 2, 3) n=3 [Fe(qsal)2] [Ni(dmit)2] Chem. Lett., 2005, 1240 ●cooling ●heating 830 nm LIESST (Light-induced excited spin state trapping) hn  M  s Photo-induced structural change Possibility of photo-controlable magnetic molecular conductors

  3. C l C l C l C l S O O S S O M M ' M M ' O S O S O S C l C l C l C l M , M ' = F e , M n , C o . . . (p-Donor)/(Mag. Anion) *Tetrahalide anion ….l-. k-(BETS)2FeCl4 …. AFSC, FISC **Layered anion……(ET)4(H3O)Fe(C2O4)3(C6H5CN)…Paramag. SC [TTF][Fe(C2O4)Cl2] …Linear anion Bin Zhang Zhu Daoben M. Kurmoo 0.04 100 Oe Canted AF below 19.8 K FC 0.03 c/emu mol-1 0.02 ZFC 0.01 100 200 300 0 T/K k-(BETS)2Fe(ox)Cl2 k-type metalwithweakly ferromagneticanion chain r sRT= 85 S cm-1

  4. a 4 b 10 H. Cui BETS FeCl4 x=1 r/ro 10 0 -1/4p 0 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● x=0 ● ● ● ● ● ● ● ● ● ● ● ● ● -10 GaCl4 ● ● ● ● ● c(emu/mol) ● -4 10 ● ● Hc Hdc= 0 Oe Amplitude=0.1Oe Frequency =0.5 Hz ● ● ● -20 ● ● ● ● ● 200 ● 100 300 0 ● ● ● -30 ● ● T/K ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● -40 2 4 3 T/K l-(BETS)2FexGa1-xCl4 conduction plane//ac 10 8 Metal 6 x0.45 T/K x0.45 4 SC Ins. 2 0 100 20 0 80 40 60 xcryst ％

  5. S. Uji ● a ● 30 b ● HJ /T 20 ● ★ ● ● ● ★ 10 ● ★ ● 0 0.2 0.4 0.6 0.8 1 0 x l-(BETS)2FeCl4 l-(BETS)2FexGa1-xCl4 S. Uji, L. Balicas, J. S. Brooks FISC H//c Brossard

  6. 8 x=0.45 H//c 6 ● ● ● ● ● ● ● ● PM ● T(K) ● S1 4 ● ● 0 ● ● ● ● ● ● ● ● ● ■ ■ ● ■ ● S2 ■ ● 2 S3 ● ■ ● ■ H//ac ■ AFI 0 10 20 0 30 ● ● ○ ○ x=0.45 H//b* 6 ● ● S. Uji S ● ● 4 T(K) ● ■ ● ■ ■ PM ■ ■ ● ■ ● AFI 2 ● ■ ■ ● 0 10 4 6 8 0 2 moH(T) 8 SC H//b* Ins.SCMetal switching l-BETS2FexGa1-xCl4(x0.45) B. Zhang, H. Tanaka

  7. H. Cui l-(BETS)2FexGa1-xCl4 Hac H//ac (x0.42) H//ac Hac H//ac AFI

  8. x 0.42 Hac H//ac 10 10 8 H//ac 8 Hac 6 T/K 6 T/K 4 4 2 2 0 0 0 15 10 0 5 15 10 5 H/T H/T l-(BETS)2FexGa1-xCl4 10 10 L. Brossard 8 8 Metal S. Uji, J. S. Brooks FeCl4 AFI 6 6 T/K T/K 4 4 SC Ins. Hc2// FISC (H//ac) 2 2 Hc2 l-(BETS)2GaCl4 at 2 K Hc2 12 T (H//a, c) 2.5 T (H//b*) (M. A. Tanatar et al.) 0 0 20 30 10 0 100 20 0 80 40 60 H/T (%) GaCl4 xcryst x 0.4

  9. 104 ● ● 102 r/W 100 M 10-2 100 SC 100 2 4 10 T/K 10-1 2.4 K 2.8 3.0 3.2 3.6 4.05 r/W 10-2 0 2 10 8 12 4 6 14 H/T H. Cui l-(BETS)2FexGa1-xCl4 (x0.37) r(H, T) Hac 104 1.0 K 1.4 2.0 103 102 101 r/W 100 10-1 10-2 10-3 0 2 10 12 4 6 8 14 H/T

  10. 104 ● ● 102 r/W 100 M 10-2 SC 2.5 K 2.8 3.2 3.5 3.7 4.1 4.5 100 2 4 10 T/K M CRS CRS 10 8 12 4 6 2 14 0 SC SC HengBo Cui r(H, T) of l-(BETS)2FexGa1-xCl4 (x0.37) H//ac 102 104 101 103 1.0 K 1.4 1.8 2.0 102 100 r/W 101 r/W 10-1 100 rm 10-1 10-2 rc 10-2 10-3 10-3 10 12 4 6 0 2 8 14 H/T rm/rc 6.4 H/T (CRS=Constant Resistivity State)

  11. 104 ● ● 102 r/W 100 M 10-2 SC 100 2 4 10 T/K Metal CRS r=const. Ins. HengBo Cui H-T Phase Diagram of l-(BETS)2FexGa1-xCl4 (x0.37) H//ac Hac Metal Ins.

  12. 10 8 Metal T/K 6 20 15 ● 4 SC Ins. x=0.37 rm/rc 6.4 rm / rc 10 ● ● 2 5 ● 0 0 0.3 0.4 0.2 1 x 0 0.8 0.4 0.6 xcryst l-(BETS)2FexGa1-xCl4 Constant Resistivity State (CRS) There exists the region of CRS in l-(BETS)2FexGa1-xCl4, where the resistivity is independent of T and H. CRS has been observed at least at 0.3<x<0.4 But CRS did not exist at x>0.42. The x-dependence of rc (resistivity of CRS): rm / rc (rm is the resistivity of metallic state just above Tc) increases with decreasing x: rm / rc 0.35 at x 0.4, 0. 7 at at x 0.37, 1.5 at x 0.3. Therefore, the critical conductivity (sc) seems to be linearly dependent on x. rm rc x=0.37 rm/rc 7.1 x=0.39 rm/rc 3.4 x0.3 rm/rc 16.1 rm rc 1 H/K

  13. Development of Multi-functional Magnetic Molecular Conductors s New k-type BETS conductor with linear magnetic anions Photo-controllable magnetic conductor k-(BETS)2Fe(ox)Cl2 hn [Fe(qsal)2][Ni(dmit)2]n c B. Zhang, D. Zhu, M. Kurmoo K. Takahashi, O. Sato Possibility of Constant Resistivity State (CRS) below Tc in l-(BETS)2FexGa1-xCl4 H. Kobayashi, H. Cui, K. Takahashi, A. Kobayashi

  14. Metal ● ● ● ● CLRS ● ● SC H. Cui x0.3 ● ● Hac H//ac rM/rc 15.6

More Related