Volume 112, Number 6, December 2015
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 January 2016|
Structure and physical properties of the misfit compounds (PbSe)1.16(TiSe2)m (m = 1, 2)
1 Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics and Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China Hefei, Anhui 230026, China
2 High Magnetic Field Laboratory, Chinese Academy of Sciences - Hefei, Anhui 230031, China
3 Collaborative Innovation Center of Advanced Microstructures, Nanjing University - Nanjing 210093, China
Received: 14 June 2015
Accepted: 24 December 2015
The single-crystalline misfit compounds (PbSe)1.16(TiSe2) and (PbSe)1.16(TiSe2)2 have been successfully synthesized. The structure and physical properties of the two misfit compounds are systematically investigated. The former consists of one-layer TiSe2 alternating stacking with double-layer PbSe, in contrast with the latter which owns double-layer TiSe2. Moreover, (PbSe)1.16(TiSe2)2 with two-layer TiSe2 shows superconductivity at 2.3 K while (PbSe)1.16(TiSe2) with one-layer TiSe2 is non-superconducting. Anisotropic resistivity indicates much stronger anisotropy of (PbSe)1.16(TiSe2)2 than that of (PbSe)1.16(TiSe2), suggesting much weaker inter-layer coupling and lower dimensionality in the former. Hall and Seebeck coefficients show a sign reversal for (PbSe)1.16(TiSe2) at low temperature, which indicates the change of charge carrier type from electron-dominated to hole-dominated. The comparison of physical properties between the two misfit compounds suggests that the lack of superconductivity in (PbSe)1.16(TiSe2) is related to the change of charge carrier type. Moreover, the reduction of dimensionality in (PbSe)1.16(TiSe2)2 may be helpful for the superconductivity.
PACS: 74.25.-q – Properties of superconductors / 74.70.-b – Superconducting materials other than cuprates / 81.20.-n – Methods of materials synthesis and materials processing
© EPLA, 2015
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