Pseudogap in a superconducting n-type cuprate: An intrinsic interlayer transport study
✍ Scribed by Tsuyoshi Kawakami; Takasada Shibauchi; Yuhki Terao; Minoru Suzuki; Lia Krusin-Elbaum
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 267 KB
- Volume
- 426-431
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
Interlayer transport in magnetic fields for a superconducting n-type cuprate Sm 2Àx Ce x CuO 4Àd is investigated. Bulk single crystals and small 30 nm-high mesa structures, sufficiently thin to be free of recently reported partial epitaxial decomposition problems, are prepared to measure the c-axis resistivity q c . In the normal state for both the mesas and the bulk crystals, it is found that the intrinsic longitudinal magnetoresistance (MR) is comprised of fundamental positive MR term in proportion to the square of field strength and negative MR term, which is a characteristic behavior of the pseudogap state reported in p-type cuprates. We find that the negative MR term manifests itself below T* = 38(±2) K. At low temperatures it remains finite below 28(±2) T. These characteristic temperature and field obey the Zeeman energy relationship found in the pseudogap state of Bi 2 Sr 2 CaCu 2 O 8+d , strongly suggesting the existence of a pseudogap similar to that of p-type cuprates.