本文通过对Nd1.85Ce0.15CuO4±δ单晶ab面(ρab)和c方向电阻率(ρc)的测量,发现未经过氮气退火的样品的ρc与温度成线性依赖关系,但是同一个样品经过氮气退火后的ρc中不仅有一次方的温度依赖关系还有二次方的.这说明样品经过氮气退火后,电子与空穴两种载流子共同参与导电.样品在退火处理前的各向异性比(ρc-ρc0)/(ρab-ρab0)存在强的温度依赖关系,这是由于ρc与温度成线性依赖关系,然而ρab不仅有一次方的温度依赖关系还有二次方的.样品经过退火处理后的各向异性比存在弱的温度依赖赖关系,这是由于ρc与ρab中都同时有一次方和二次方的温度依赖关系.我们用电子和空穴沿c方向有不同的隧穿几率来解释ρc和(ρc-ρc0)/(ρab-ρab0).
参考文献
[1] | Y Tokura;H Takgai;S Uchida .[J].Nature(London),1989,337:345. |
[2] | S Kubo;M Suzuki .[J].Physica C(Amsterdam),1991,185-189:1251. |
[3] | Wu jiang;J L Peng;Z Y Li;R L Greene .[J].Physical Review B:Condensed Matter,1993,47:8151. |
[4] | Wujiang et al.[J].Physical Review Letters,1994,73:1291. |
[5] | P Fournier et al.[J].Physical Review B:Condensed Matter,1997,56:14149. |
[6] | N P Annitage et al.[J].Physical Review Letters,2001,87:147003. |
[7] | N P Armitage et al.[J].Physical Review Letters,2002,88:257001. |
[8] | H Matsui et al.[J].Physical Review Letters,2005,94:047005. |
[9] | T Claesson et al.[J].Physical Review Letters,2004,93:136402. |
[10] | C Kusko et al.[J].Physical Review B:Condensed Matter,2002,66:140513. |
[11] | H X Gao et al.[J].Physics Letters A,2007,369:493. |
[12] | Wu Jiang et al.[J].Physical Review B:Condensed Matter,1993,48:657. |
[13] | N L Wang et al.[J].Physical Review B,1996,54:7449. |
[14] | T B Charikova et al.[J].Physica C,2000,341-348:1561. |
[15] | Y H Su;H G Luo;T Xiang .[J].Physical Review B:Condensed Matter,2006,73:134510. |
[16] | C H Wang;L Huang;L Wang .Single crystal growth and anisotropic resistivity of electron-type Nd_(2-x)Ce_xCu_(4-y)[J].Superconductor Science & Technology,2004(3):469-473. |
[17] | Seiki Komiya et al.[J].Physical Review B:Condensed Matter,2002,65:214535. |
[18] | H Wu;L Zhao et al.[J].Physical Review B:Condensed Matter,2006,73:104512. |
[19] | Anatoley T Zheleznyak et al.[J].Physical Review B:Condensed Matter,57 |
[20] | Y Onose et al.[J].Physical Review B:Condensed Matter,2004,69:024504. |
[21] | O. K. ANDERSEN;A. I. LIECHTENSTEIN;O. JEPSEN;F. PAULSEN .LDA ENERGY BANDS, LOW-ENERGY HAMILTONIANS, t′, t″, t_⊥ (k), and J_⊥.[J].The journal of physics and chemistry of solids,1995(12):1573-1591. |
[22] | S Chakravarty et al.[J].Science,1993,261:337. |
[23] | T Xiang;J M Wheatley .[J].Physical Review Letters,1996,77:4632. |
[24] | T Xiang et al.[J].International Journal of Modern Physics B:Cosmology and Nuclear Physics,1998,12:1007. |
[25] | D L Feng et al.[J].Physical Review Letters,2001,86:5550. |
[26] | 曾谨严.量子力学卷Ⅰ[M].北京:科学出版社,2000:101. |
[27] | D E Soule .[J].Physical Review,1958,112:3. |
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