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Study of charge density waves in suspended 2H-TaS2 and 2H-TaSe2 by nanomechanical resonance

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Study of charge density waves in suspended 2H-TaS2 and 2H-TaSe2 by nanomechanical resonance

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dc.contributor.author	Lee, Martin
dc.contributor.author	Siskins, Makars
dc.contributor.author	Mañas Valero, Samuel
dc.contributor.author	Coronado Miralles, Eugenio
dc.contributor.author	Steeneken, P. G.
dc.contributor.author	Van der Zant, H. S. J.
dc.date.accessioned	2021-06-01T10:13:55Z
dc.date.available	2021-06-02T04:45:05Z
dc.date.issued	2021	es_ES
dc.identifier.citation	Martin Lee; Makars Šiškins; Samuel Mañas-Valero; Eugenio Coronado; Peter G. Steeneken; Herre S. J. van der Zant. Study of charge density waves in suspended 2H-TaS2 and 2H-TaSe2 by nanomechanical resonance Appl. Phys. Lett. 118, 193105 (2021).	es_ES
dc.identifier.uri	https://hdl.handle.net/10550/79528
dc.description.abstract	The charge density wave (CDW) state in van der Waals systems shows interesting scaling phenomena as the number of layers can significantly affect the CDW transition temperature, TCDW. However, it is often difficult to use conventional methods to study the phase transition in these systems due to their small size and sensitivity to degradation. Degradation is an important parameter, which has been shown to greatly influence the superconductivity in layered systems. Since the CDW state competes with the onset of superconductivity, it is expected that TCDW will also be affected by the degradation. Here, we probe the CDW phase transition by the mechanical resonances of suspended 2H-TaS2 and 2H-TaSe2 membranes and study the effect of disorder on the CDW state. Pristine flakes show the transition near the reported values of 75 K and 122 K, respectively. We then study the effect of degradation on 2H-TaS2, which displays an enhancement of TCDW up to 129 K after degradation in ambient air. Finally, we study a sample with local degradation and observe that multiple phase transitions occur at 87 K, 103 K, and 118 K with a hysteresis in temperature in the same membrane. The observed spatial variations in the Raman spectra suggest that variations in crystal structure cause domains with different transition temperatures, which could result in the hysteresis. This work shows the potential of using nanomechanical resonance to characterize the CDW in suspended 2D materials and demonstrates that the degradation can have a large effect on transition temperatures.	es_ES
dc.description.sponsorship	European Research Council	es_ES
dc.description.sponsorship	Generalitat Valenciana
dc.description.sponsorship	Ministerio de Ciencia e Innovación
dc.language.iso	en	es_ES
dc.subject	2H-TaS2	es_ES
dc.subject	2H-TaSe2	es_ES
dc.title	Study of charge density waves in suspended 2H-TaS2 and 2H-TaSe2 by nanomechanical resonance	es_ES
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::QUÍMICA	es_ES
dc.identifier.doi	10.1063/5.0051112	es_ES
dc.identifier.idgrec	147440
dc.accrualmethod	-	es_ES
dc.embargo.terms	0 days	es_ES
dc.relation.projectID	ERC AdG Mol-2D No. 788222
dc.relation.projectID	MICINN/ES/MAT2017–89993-R
dc.relation.projectID	CEX2019–000919-M
dc.relation.projectID	GV/FEDER Program/IDIFEDER/2018/061