铜氧化物超导体两能隙问题的电子拉曼散射理论研究

路洪艳; 陈三; 刘保通

doi:10.7498/aps.60.037402

摘要

电子拉曼实验表明在空穴型掺杂的铜氧化物超导体中存在两能隙行为,即在欠掺杂区,随着掺杂浓度的降低,一个能隙逐渐增大而且在超导转变温度以上仍然存在,而另一个能隙逐渐减小且在DDW态依然存在.解释两能隙行为非常重要因为它与赝能隙的机理密切相关.本文计算了超导序和d-density-wave(DDW)序竞争机理下相图上不同区域的电子拉曼谱,发现欠掺杂区能隙表现出两能隙行为,与实验一致.特别地,本文发现B1g峰对应能量由超导和DDW序共同决定,且随着掺杂浓度的降低而增大,在D

关键词:

Abstract

Electronic Raman experiments have shown the presence of two types of gaps in hole-doped cuprate superconductors: one is the gap that increases with underdoping and survives in the pseudogap normal state and the other is the gap that traces the superconducting dome and disappears above the transition temperature. This two-gap behavior is important in that it is related to the mechanism of the pseudogap. By calculating the electronic Raman spectra we show that this behavior is consistent with the picture in which the d-wave superconducting (SC) order and d-density-wave (DDW) order compete in the phase diagram. In particular, the energy of the B1g peak is determined by both the SC and the DDW orders, increases with underdoping and survives in the DDW normal state. On the other hand, the B2g peak is shown to be sensitive to the SC order alone, and thus vanishes in the normal state (even if in the presence of the DDW order). The doping dependence and the temperature dependence of the peak energies in the two channels accord nicely with recent experimental results, which strongly supports the competing-order point of view for the superconducting and pseudogap phases.

Keywords:

作者及机构信息

1.
淮北师范大学物理与电子信息学院,淮北 235000

基金项目: 国家自然科学基金(批准号:10974086,60806015),南京固体微结构国家实验室开放基金(批准号:M22010)和安徽省教育厅自然科学基金(批准号:KJ2010B184)资助的课题.

Authors and contacts

1.
School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000,China

参考文献

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[17]	Emery V, Kivelson S A 1995 Nature 374 434
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施引文献

[1]	Deutscher G 1999 Nature 397 410
[2]	Tanaka K, Lee W S, Lu D H, Fujimori A, Fujii T, Risdiana, Terasaki I, Scalapino D J, Devereaux T P, Hussain Z, Shen Z X 2006 Science 314 1910
[3]	Kondo T, Takeuchi T, Kaminski A, Tsuda S, Shin S 2007 Phys. Rev. Lett. 98 267004
[4]	Terashima K, Matsui H, Sato T, Takahashi T, Kofu M, Hirota K 2007 Phys. Rev. Lett. 99 017003
[5]	Lee W S, Vishik I M, Tanaka K, Lu D H, Sasagawa T, Nagaosa N, Devereaux T P, Hussain Z, Shen Z X 2007 Nature 450 81
[6]	Yu L, Munzar D, Boris A V, Yordanov P, Chaloupka J, Wolf T, Lin C T, Keimer B, Bernhard C 2008 Phys. Rev. Lett. 100 177004
[7]	Venturini F, Opel M, Hackl R, Berger H, Forró L, Revaz B, 2002 J. Phys. Chem. Solids 63 2345
[8]	Tacon M L, Sacuto A, Georges A, Kotliar G, Gallais Y, Colson D, Forget 2006 Nat. Phys. 2 537
[9]	Guyard W, Tacon M L, Cazayous M, Sacuto A, Georges A, Colson D, Forget A 2008 Phys. Rev. B 77 024524
[10]	Guyard W, Sacuto A, CazayousM, Gallais Y, Tacon M L, Colson D, Forget A 2008 Phys. Rev. Lett. 101 097003
[11]	Yu M, Yang H S, Chai Y S, Li P C, Li M D, Cao L Z 2002 Acta Phys. Sin. 51 1832 (in Chinese ) [余旻、杨宏顺、柴一晟、李鹏程、李明德、曹烈兆 2002 物理学报 51 1832]
[12]	Zhao Y L, Zheng P, Chen Z J, Ren Q B, Xu Z A, Jiao Z K,Zhang Y J, Ong C K 2002 Acta Phys. Sin. 51 1836 (in Chinese ) [赵彦立、郑萍、陈兆甲、任清褒、许祝安、焦正宽、Zhang Y J 、Ong C K 2002 物理学报 51 1836]
[13]	Devereaux T P, Hackl R 2007 Rev. Mod. Phys. 79 175
[14]	Slakey F, Klein M V, Rice J P, Ginsberg D M 1990 Phys. Rev. B 42 2643
[15]	Blumberg G, Kang M, Klein M V, Kadowaki K, Kendziora C 1997 Science 278 1427
[16]	Nemetschek R, Opel M, HoffmannC, Müller P F, Hackl R, Berger H, Forró L, Erb A, Walker E 1997 Phys. Rev. Lett. 78 4837
[17]	Emery V, Kivelson S A 1995 Nature 374 434
[18]	Chakravarty S, Laughlin R B, Morr D K, Nayak C 2001 Phys. Rev. B 63 094503
[19]	Lu H Y, Wan Y, He X M, Wang Q H 2009 Chin. Phys. Lett. 26 097402
[20]	Zeyher R, Greco A 2002 Phys. Rev. Lett. 89 177004 Zeyher R, Greco A 2004 Physica C 408 410
[21]	Wu J B 2006 Acta Phys. Sin. 55 2049 (in Chinese ) [吴建宝 2006 物理学报 55 2049]

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