Quasiparticle dynamics in overdoped Bi_(1.4) Pb(0.7)Sr(1.9)CaCu_2O_(8+δ):Coexistence of superconducting gap and pseudogap below T_c

Saritha K. Nair; Xingquan Zou; Elbert E. M. Chia; Jian-Xin Zhu; C. Panagopoulos; S. Ishida; S. Uchida

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Quasiparticle dynamics in overdoped Bi_(1.4) Pb(0.7)Sr(1.9)CaCu_2O_(8+δ):Coexistence of superconducting gap and pseudogap below T_c

机译：Bi_（1.4）Pb（0.7）Sr（1.9）CaCu_2O_（8 +δ）掺杂中的准粒子动力学：T_c以下超导隙和拟隙的共存

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Photoexcited quasiparticle relaxation dynamics in overdoped Bi_2Sr_2CaCu_2O_(8+δ) (T_c=65 K, hole doping p=0.22) single crystal is investigated as a function of temperature. We provide evidence of a ～22 meV pseudogap (T= 100 K) at this doping level. Moreover, this pseudogap vanishes at 7*. Our data support the scenario where both the superconducting gap and pseudogap coexist in the superconducting state. Our results also suggest an increased scattering rate between electrons and spin fluctuations as the sample enters the pseudogap phase.

机译：研究了超掺杂Bi_2Sr_2CaCu_2O_（8 +δ）（T_c = 65 K，空穴掺杂p = 0.22）单晶中光激发的准粒子弛豫动力学随温度的变化。我们提供了在此掺杂水平下〜22 meV的伪间隙（T = 100 K）的证据。此外，该伪间隙在7 *处消失。我们的数据支持超导间隙和伪间隙同时存在于超导状态的情况。我们的结果还表明，当样品进入伪间隙相时，电子之间的散射率和自旋波动会增加。

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《Physical review》 |2010年第21期|p.212503.1-212503.4|共4页
作者
Saritha K. Nair; Xingquan Zou; Elbert E. M. Chia; Jian-Xin Zhu; C. Panagopoulos; S. Ishida; S. Uchida;
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Division of Physics and Applied Physics, School of Physical and Mathematical Sciences,Nanyang Technological University, 637371 Singapore, Singapore;

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences,Nanyang Technological University, 637371 Singapore, Singapore;

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences,Nanyang Technological University, 637371 Singapore, Singapore;

Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences,Nanyang Technological University, 637371 Singapore, Singapore and Department of Physics, University of Crete and FORTH, 71003 Heraklion, Greece;

Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;

Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;

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1. Superconducting gap and pseudogap for overdoped Bi_(2-x)Pb_xSr_2CaCu_2O_(8+δ) using 60 ns time-scale short-pulse interlayer tunneling spectroscopy [J] . Kenkichi Anagawa, Takao Watanabe, Minoru Suzuki Physical review. B, Condensed Matter And Materials Physics . 2006,第18期

机译：使用60 ns时标短脉冲层间隧穿光谱技术对Bi_（2-x）Pb_xSr_2CaCu_2O_（8 +δ）掺杂的超导间隙和拟间隙
2. Effect of hole doping on the London penetration depth in Bi_(2.15)Sr_(1.85)CaCu_2O_(8+δ) and Bi_(2.1)Sr_(1.9)Ca_(0.85)Y_(0.15)Cu_2O_(8+δ) [J] . W. Anukool, S. Barakat, C. Panagopoulos, Physical review . 2009,第2期

机译：空穴掺杂对Bi_（2.15）Sr_（1.85）CaCu_2O_（8 +δ）和Bi_（2.1）Sr_（1.9）Ca_（0.85）Y_（0.15）Cu_2O_（8 +δ）中伦敦渗透深度的影响
3. Absence of μSR evidence for magnetic order in the pseudogap phase of Bi_(2+x)Sr_(2-x)CaCu_2O_(8+δ) [J] . S. Gheidi, K. Akintola, A. C. Y. Fang, Physical review . 2020,第18期

机译：在Bi_（2 + x）sr_（2-x）cacu_2o_（8 +δ）的伪曲面阶段中磁场缺失μsr证据
4. Effects of K Doping on Structural and Superconducting Properties of Bi_(1.5)Pb_(0.5)Sr_(1.8)CaCu_2O_(8+δ) Compounds [C] . K Belala, M.F Mosbah International Advances in Applied Physics and Materials Science Congress . 2013

机译：K掺杂对Bi_（1.5）Pb_（0.5）Sr_（1.8）Cacu_2O_（8 +δ）化合物的结构和超导性能的影响
5. Understanding unconventional superconductors: On the origin of Cooper pairing in Sr2RuO4 and the broken symmetries in the pseudogap regime of the cuprates [D] . Almeida Firmo, Ines. 2014

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6. Momentum-resolved superconducting energy gaps of Sr2RuO4 from quasiparticle interference imaging [O] . Rahul Sharma, Stephen D. Edkins, Zhenyu Wang, 2020

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7. Quasiparticle dynamics in overdoped Bi$_{1.4}$Pb$_{0.7}$Sr$_{1.9}$CaCu$_{2}$O$_{8+\delta}$: Coexistence of superconducting gap and pseudogap below $T_{c}$ [O] . Nair, Saritha K., Zou, X. Q., Zhu, Jian-Xin, 2010

机译：过度的准粒子动力学 Bi $ _ {1.4} $ pb $ _ {0.7} $ sr $ _ {1.9} $ CaCu $ _ {2} $ O $ _ {8+ \ delta} $：共存 $ T_ {c} $以下的超导间隙和赝隙

Quasiparticle dynamics in overdoped Bi_(1.4) Pb(0.7)Sr(1.9)CaCu_2O_(8+δ):Coexistence of superconducting gap and pseudogap below T_c

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