Structure and physical properties of the misfit compounds (PbSe)1.16(TiSe2)m (m = 1, 2)

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,...

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Bibliographic Details
Published in:Europhysics letters 2015-12, Vol.112 (6), p.67007
Main Authors: Wang, N. Z., Yuan, S. F., Cong, R., Lu, X. F., Meng, F. B., Shang, C., Chen, X. H.
Format: Article
Language:English
Subjects:
74.25.-q
74.70.-b
81.20.-n
Anisotropy
Current carriers
Lead selenides
Low temperature
Physical properties
Seebeck effect
Single crystals
Superconductivity
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Summary: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.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/112/67007