Feedback Effect on High-Energy Magnetic Fluctuations in the Model High-Temperature Superconductor HgBa2CuO4+δ Observed by Electronic Raman Scattering

被引：26

作者：

Li, Yuan ^{[1
,2
]}

Le Tacon, M. ^{[1
]}

Bakr, M. ^{[1
]}

Terrade, D. ^{[1
]}

Manske, D. ^{[1
]}

Hackl, R. ^{[3
]}

Ji, L. ^{[4
]}

Chan, M. K. ^{[4
]}

Barisic, N. ^{[4
]}

Zhao, X. ^{[4
,5
]}

Greven, M. ^{[4
]}

Keimer, B. ^{[1
]}

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[2] Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China

[3] Bavarian Acad Sci & Humanities, Walther Meissner Inst, D-85748 Garching, Germany

[4] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[5] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 22期

关键词：

HIGH-T-C; INELASTIC LIGHT-SCATTERING; UNDERDOPED BI2SR2CACU2O8+DELTA; CUPRATE SUPERCONDUCTORS; PAIRING INTERACTION; SPIN-FLUCTUATION; PSEUDOGAP STATE; PHASE; EXCITATIONS; GAP;

D O I：

10.1103/PhysRevLett.108.227003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use electronic Raman scattering to study the model single-layer cuprate superconductor HgBa2CuO4+delta. In an overdoped sample, we observe a pronounced amplitude enhancement of a high-energy peak related to two-magnon excitations in insulating cuprates upon cooling below the critical temperature T-c. This effect is accompanied by the appearance of the superconducting gap and a pairing peak above the gap in the Raman spectrum, and it can be understood as a hitherto-undetected feedback effect on the high-energy magnetic fluctuations due to the Cooper pairing interaction. This implies a direct involvement of the high-energy magnetic fluctuations in the pairing mechanism. All of these effects occur already above T-c in two underdoped samples, demonstrating a related feedback mechanism associated with the pseudogap.

引用

页数：6

共 65 条

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