Phase transitions and electrical conductivity of selenium disulfide at high pressure

Year: 2026

Authors: Hu HX., Osmond I., Strain C., Shuttleworth H.A., Stevens CR., Huxley A., Kuzovnikov MA., Gorelli F.A., Gregoryanz E., Pesa-Alvarez M., Dalladay-Simpson P., Howie R.T.

Autors Affiliation: Ctr High Pressure Sci & Technol Adv Res, 1690 Cailun Rd,Bldg 6, Shanghai 201203, Peoples R China; Univ Edinburgh, Ctr Sci Extreme Condit, Peter Guthrie Tait Rd, Edinburgh EH9 3FD, Scotland; Univ Edinburgh, Sch Phys & Astron, Peter Guthrie Tait Rd, Edinburgh EH9 3FD, Scotland; Shanghai Adv Res Phys Sci SHARPS, 68 Huatuo Rd,Bldg 3, Shanghai 201203, Peoples R China; CNR, Inst Nazl Ott, INO, I-50019 Sesto Fiorentino, Italy; Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China.

Abstract: Sulfur and selenium demonstrate one of the most complex behavior under high pressure among all elements of the periodic table. Despite being known to form interchalcogens, the properties of these compounds have not been widely explored in the dense state. Through a series of diamond anvil experiments combined with x-ray diffraction, optical spectroscopy, and electrical resistance measurements, we explore the properties of selenium disulfide (SeS2) up to pressures of 150 GPa. At ambient pressure, SeS2-I represents a substitutional solid solution of S and Se atoms, forming an eight-membered molecular ring arrangement analogous to gamma-S. The band gap of SeS2-I rapidly closes upon compression, and above 27 GPa, there is a transformation to a metallic tetragonal phase (SeS2-III), in which atoms form square helical chains. Upon further compression, we observe a phase sequence from incommensurate modulated SeS2-IV above 59 GPa, transforming to rhombohedral SeS2-V by 116 GPa.

Journal/Review: PHYSICAL REVIEW B

Volume: 113 (21)      Pages from: 214101-1  to: 214101-7

More Information: The work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 948895, MetElOne) , the UKRI Future Leaders fellowship, Grant No. Mrc-Mr/T043733/1, and the National Natural Science Foundation of China (NSFC) reference code W2532012. We acknowledge DESY (Hamb urg, Germany) , a member of the Helmholtz Association HGF, for the provision of beam line P02.2 at PETRA-III, allocated under Proposal No. I-20230232, and we would like to thank Hanns-Peter Liermann and Timofey Fedotenko for their assistance. Part of this work was performed at BL10XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2019A1260) . We thank S. Kawaguchi for the beam-line support. We acknowledge the support of the Diamond Light Source for providing the beam time at the I15 beam line. We would like to thank M. Hanfland and G. Gar-barino for their help with the ID15-b beam line at ESRF allocated under Proposal No. HC4446, and M. Mezouar and B. Wehinger for their help with ID27 beam line allocated under Proposal No. HC4878.
KeyWords: X-ray-diffraction; Induced Superconductivity; Chain Structures; Sulfur; Program; Gpa
DOI: 10.1103/s6wf-56gj