Recently, the formation of charge density wave in 3D structure, Lu5Ir4Si10, had been observed in the X-ray diffraction experiment. At the same time, the transition in Lu5Ir4Si10 was thought to be first-order due to the spike-shaped anomaly in specific heat. The first-order transition usually accompanies with thermal hysteresis. In order to clarify this problem, we measure and analyze the specific heat result of Lu5Ir4Si10. As a matter of fact, we don¡¦t observe the thermal hysteresis behavior within the resolution of our apparatus, and we think the formation of CDW in Lu5Ir4Si10 is strong interchain coupling.
In addition, we also perform the resistivity, magnetic susceptibility and specific heat measurements under zero and external field on the isostructure component Lu5Rh4Si10 for comparison, which has also been thought to undergo a CDW transition. We indeed observe the thermal hysteresis behavior no matter on resistivity, susceptibility or on specific heat results, and this phenomenon doesn¡¦t have magnetic effects. The thermal hysteresis features in Lu5Rh4Si10 are attributed to the presence of metastable states due to the pinning of the CDW phase to impurities, and we also discuss some possibilities about it.
The specific heat measurement in our research is performed with an ac calorimetry, using chopped light as a heat source. The details of this technique are also discussed.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0629101-131503 |
| Date | 29 June 2001 |
| Creators | Hsu, Fung-Hsueh |
| Contributors | Hung-Duen Yang, Jiunn-Yuan Lin, Yung-Kang Kuo |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0629101-131503 |
| Rights | unrestricted, Copyright information available at source archive |
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