Next Article in Journal
Bonding SiCp/Al Composites via Laser-Induced Exothermic Reactions
Next Article in Special Issue
Absence of Superconductivity in the Hubbard Dimer Model for κ-(BEDT-TTF)2X
Previous Article in Journal
The Influence of Recrystallization on Zinc Oxide Microstructures Synthesized with Sol–Gel Method on Scintillating Properties
Previous Article in Special Issue
Evolution of Shape and Volume Fraction of Superconducting Domains with Temperature and Anion Disorder in (TMTSF)2ClO4
Article

High-Pressure Crystal Structure and Unusual Magnetoresistance of a Single-Component Molecular Conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate)

1
Condensed Molecular Materials Laboratory RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
2
School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
3
Inorganic Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QR, UK
4
Beamline I19, Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: Martin Dressel
Crystals 2021, 11(5), 534; https://doi.org/10.3390/cryst11050534
Received: 29 March 2021 / Revised: 3 May 2021 / Accepted: 5 May 2021 / Published: 11 May 2021
(This article belongs to the Special Issue Organic Conductors)
A single-component molecular crystal [Pd(dddt)2] has been shown to exhibit almost temperature-independent resistivity under high pressure, leading theoretical studies to propose it as a three-dimensional (3D) Dirac electron system. To obtain more experimental information about the high-pressure electronic states, detailed resistivity measurements were performed, which show temperature-independent behavior at 13 GPa and then an upturn in the low temperature region at higher pressures. High-pressure single-crystal structure analysis was also performed for the first time, revealing the presence of pressure-induced structural disorder, which is possibly related to the changes in resistivity in the higher-pressure region. Calculations based on the disordered structure reveal that the Dirac cone state and semiconducting state coexist, indicating that the electronic state at high pressure is not a simple Dirac electron system as previously believed. Finally, the first measurements of magnetoresistance on [Pd(dddt)2] under high pressure are reported, revealing unusual behavior that seems to originate from the Dirac electron state. View Full-Text
Keywords: single-component molecular conductor; pressure effect; Dirac electron system; resistivity; magnetoresistance; synchrotron X-ray diffraction; band calculation single-component molecular conductor; pressure effect; Dirac electron system; resistivity; magnetoresistance; synchrotron X-ray diffraction; band calculation
Show Figures

Figure 1

MDPI and ACS Style

Cui, H.; Yeung, H.H.-M.; Kawasugi, Y.; Minamidate, T.; Saunders, L.K.; Kato, R. High-Pressure Crystal Structure and Unusual Magnetoresistance of a Single-Component Molecular Conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate). Crystals 2021, 11, 534. https://doi.org/10.3390/cryst11050534

AMA Style

Cui H, Yeung HH-M, Kawasugi Y, Minamidate T, Saunders LK, Kato R. High-Pressure Crystal Structure and Unusual Magnetoresistance of a Single-Component Molecular Conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate). Crystals. 2021; 11(5):534. https://doi.org/10.3390/cryst11050534

Chicago/Turabian Style

Cui, Hengbo, Hamish H.-M. Yeung, Yoshitaka Kawasugi, Takaaki Minamidate, Lucy K. Saunders, and Reizo Kato. 2021. "High-Pressure Crystal Structure and Unusual Magnetoresistance of a Single-Component Molecular Conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate)" Crystals 11, no. 5: 534. https://doi.org/10.3390/cryst11050534

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop