Heating Causes Nonlinear Microwave Absorption Anomaly in Single‐Walled Carbon Nanotubes. Issue 12 (13th July 2018)

• Record Type: Journal Article
• Authors: Márkus, Bence G.; Gyüre‐Garami, Balázs; Sági, Olivér; Csősz, Gábor; Karsa, Anita; Márkus, Ferenc; Simon, Ferenc
• Is Part Of: Physica status solidi. Volume 255:Issue 12(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-13
• Subjects: heating effects -- microwave conductivity -- single‐walled carbon nanotubes; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201800258
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : Microwave impedance measurements indicate a nonlinear absorption anomaly in single‐walled carbon nanotubes at low temperatures (below 20 K). We investigate the nature of the anomaly using a time resolved microwave impedance measurement technique. It proves that the anomaly has an extremely slow, a few hundred second long dynamics. This strongly suggests that the anomaly is not caused by an intrinsic electronic effect and that it is rather due to a slow heat exchange between the sample and the environment. Abstract : Microwave impedance measurements indicate a nonlinear absorption anomaly in single‐walled carbon nanotubes at low temperatures (below 20 K). The nature of the anomaly is investigated using a freshly designed time resolved microwave impedance measurement technique (left picture). It proves that the anomaly has an extremely slow, a few hundred second long dynamics (right picture). This strongly suggests that the anomaly is not caused by an intrinsic electronic effect and that it is rather due to a slow heat exchange between the sample and the environment.