正常金属/d_(x^2-y^2)+id_(xy)混合波超导隧道结中的微分电导  被引量:5

DIFFERENTIAL CONDUCTANCE IN THE NORMAL METAL/d_(x^2-y^2)+id_(xy) MIXED WAVE SUPERCONDUCTOR TUNNEL JUNCTIONS

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作  者:魏健文[1] 

机构地区:[1]淮阴师范学院物理系,江苏淮安223001

出  处:《低温物理学报》2004年第2期164-169,共6页Low Temperature Physical Letters

摘  要:运用Bogoliubov deGennes(BdG)方程和Blonder Tinkham Klapwijk(BTK)理论 ,计算了正常金属 /dx2 -y2 +idxy混合波超导隧道结中的准粒子输运系数和微分电导 .研究表明 :(1)影响电导谱中零偏压电导峰滑移的因素有杂质散射、dxy波分量、混合波两分量的强度比、界面的势垒散射强度、超导晶轴方位等 ,其中dxy波分量的存在和超导晶轴方位是关键因素 ;(2 )在θ=π4 的情况下 ,零偏压电导峰出现的条件为Δ2 =0或α =nπ4 ;(3)Using Bogoliubov-de Gennes (BdG) equation and Blonder-Tinkham-Klapwijk (BTK) theory, we calculate the quasiparticle transport coefficients and the differential conductance in the normal metal/d-{x+2-y+2}+id-{xy} mixed wave superconductor tunnel junctions. It is found that: (1) the slipping of the zero-bias conductance peak is influenced by the impurities scattering, the d-{xy}-wave component, the strength ratio of the two components of mixed wave, the potential scattering of interface and the orientation of superconducting crystal axis etc., among which the second and the fifth are the key factors; (2) the formation condition of the zero-bias conductance peak is Δ-2=0 or α=nπ4, when θ is π4; (3) the incidence angle of particles have notable influence on the height of conductance peak.

关 键 词:混合波超导隧道结 微分电导 准粒子输运系数 杂质散射 势垒散射强度 

分 类 号:O511[理学—低温物理]

 

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