Magnetism and Pressure-Induced Superconductivity of Checkerboard-Type Charge-Ordered Molecular Conductor β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6)
Abstract
:1. Introduction
2. Results and Discussion
2.1. Metallic State at 298 K to Charge-Ordered State at 30 K for β-(meso-DMBEDT-TTF)2AsF6
a (Å) | b1 (Å) b2 (Å) b3 (Å) b4 (Å) | c1 (Å) c2 (Å) c3 (Å) c4 (Å) | d1 (Å) d2 (Å) | δ1 | δ2 | |
---|---|---|---|---|---|---|
charge-rich donor | 1.379(4) | 1.735(3) 1.728(3) 1.722(3) 1.741(2) | 1.748(3) 1.743(3) 1.752(3) 1.751(3) | 1.354(4) 1.350(4) | +0.76(3) | +0.65(3) [=0.76(3)/ (0.76(3)+0.41(3)) ] |
charge-poor donor | 1.354(4) | 1.745(2) 1.751(3) 1.753(4) 1.740(2) | 1.749(4) 1.757(3) 1.760(3) 1.757(4) | 1.357(4) 1.350(4) | +0.41(3) | +0.35(3) [=0.41(3)/ (0.76(3)+0.41(3))] |
Direction | 298 K | Direction | 11.5 K | 30 K | |
---|---|---|---|---|---|
PF6 | AsF6 | PF6 | AsF6 | ||
r1 | 8.24 | 9.86 | r1 | 12.6 | 12.9 |
r 2 | 22.6 | 20.9 | r2 | 25.3 | 25.1 |
r 3 | - | - | r3 | 18.2 | 18.7 |
r 4 | - | - | r4 | 25.3 | 25.1 |
p1 | −4.75 | −4.89 | p1 | −4.4 | −4.3 |
p2 | - | - | p2 | −6.1 | −6.1 |
q1 | 4.38 | 4.03 | q1 | 3.7 | 3.7 |
q2 | 11.5 | 10.7 | q2 | 10.7 | 10.6 |
q3 | - | - | q3 | 4.2 | 4.3 |
q4 | - | - | q4 | 10.7 | 10.6 |
r2/r1 | 2.74 | 2.12 | r2/r1 | 2.01 | 1.94 |
r4/r3 | - | - | r4/r3 | 1.39 | 1.34 |
Ref. | [4] | this work | - | [6] | this work |
WU | WL | W | Eg | ∆E | WU/∆E | ref. | |
---|---|---|---|---|---|---|---|
β-(meso-DMBEDT-TTF)2PF6 | 0.50 | 0.40 | 0.93 | 0.02 | 0.45 | 1.11 | [4] |
β-(meso-DMBEDT-TTF)2AsF6 | 0.51 | 0.43 | 0.92 | 0 | 0.42 | 1.23 | this work |
κ-(BEDT-TTF)2Cu(NCS)2 | 0.57 | 0.36 | 1.08 | 0.16 | 0.46 | 1.24 | [11,12,13] |
κ-(BEDT-TTF)2Cu2(CN)3 | 0.50 | 0.33 | 1.00 | 0.17 | 0.45 | 1.11 | 13] |
2.2. Pressure-Induced Superconductivity of β-(meso-DMBEDT-TTF)2AsF6
2.3. Magnetic Susceptibility of β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6)
3. Experimental Section
4. Conclusions
Acknowledgments
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Shikama, T.; Shimokawa, T.; Lee, S.; Isono, T.; Ueda, A.; Takahashi, K.; Nakao, A.; Kumai, R.; Nakao, H.; Kobayashi, K.; et al. Magnetism and Pressure-Induced Superconductivity of Checkerboard-Type Charge-Ordered Molecular Conductor β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6). Crystals 2012, 2, 1502-1513. https://doi.org/10.3390/cryst2041502
Shikama T, Shimokawa T, Lee S, Isono T, Ueda A, Takahashi K, Nakao A, Kumai R, Nakao H, Kobayashi K, et al. Magnetism and Pressure-Induced Superconductivity of Checkerboard-Type Charge-Ordered Molecular Conductor β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6). Crystals. 2012; 2(4):1502-1513. https://doi.org/10.3390/cryst2041502
Chicago/Turabian StyleShikama, Takahisa, Tatsuya Shimokawa, Sanguchul Lee, Takayuki Isono, Akira Ueda, Kazuyuki Takahashi, Akiko Nakao, Reiji Kumai, Hironori Nakao, Kensuke Kobayashi, and et al. 2012. "Magnetism and Pressure-Induced Superconductivity of Checkerboard-Type Charge-Ordered Molecular Conductor β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6)" Crystals 2, no. 4: 1502-1513. https://doi.org/10.3390/cryst2041502