| Project/Area Number |
17540312
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University |
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Principal Investigator |
NISHIZAKI Terukazu Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (90261510)
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| Project Period (FY) |
2005 – 2006
|
| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Cuprate oxide superconductor / Scanning tunneling microscopy / Nano-electronic state / Hidden electronic order |
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| Research Abstract |
To study the nanoscale electronic order in high-T_c superconductors, we have performed low-temperature scanning tunneling microscopy (STM) experiments on YBa_2Cu_3O_y single crystals. The electronic state of the underdoped CuO_2 plane is studied through the BaO surface taking advantage of the cleaved surface, which has an insufficient carrier doping into the topmost CuO_2 plane because of the incomplete carrier reservoir. The STM image measured at low bias-voltage below 20 mV shows the one-dimensional (1D) electronic modulation along the Cu-O bonds. The 1D modulation do not have long-range order and the periodicity varies within the range~2a-4a depending on the position on the surface. These results indicate that electronic order in underdoped YBa_2Cu_3O_y differs from the 4aX4a checkerboard structure observed in Bi_2Sr_2CaCu_2O_y and Ca_<2-x>Na_xCuO_2Cl_2.
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