Anisotropic resistivity of YBa2Cu4O8: Incoherent-to-metallic crossover in the out-of-plane transport
Anisotropic resistivity of YBa2Cu4O8: Incoherent-to-metallic crossover in the out-of-plane transport
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DOI：
10.1103/physrevb.56.r11423
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发表时间：
1997-11-01
影响因子：
3.7
通讯作者：
Tanabe, K
中科院分区：
文献类型：
--
作者：
Hussey, NE;Nozawa, K;Tanabe, K
测量了高质量YBa_2Cu_4 O_8单晶在沿着所有三个晶轴方向上直至450 K的电阻率。面内和面外折射率都显示出从高温冷却时的行为的明显变化。相比之下，链电阻率rho（chain）（T）在整个温度范围内服从T-2定律。c轴电阻率rho（c）（T）在高T下几乎与T无关，但随着温度降低，斜率d rho（c）/dT逐渐增大，c轴输运从非相干过渡到金属性，这意味着在低T下开始出现三维电导率。这些测量结果表明，低掺杂铜酸盐中rho（c）（T）的非金属行为并不普遍。[S0163-1829（97）50242-6]。
The resistivities: of high-quality single crystals of YBa2Cu4O8 have been measured along all three crystallographic axes up to 450 K. Both the in-plane and out-of-plane resistivities show a distinct change in behavior on cooling from high temperatures. The chain resistivity rho(chain)(T), by contrast, obeys a T-2 law over the entire temperature range. The c-axis resistivity rho(c)(T) is almost T independent at high T, but as the temperature is reduced, the slope d rho(c)/dT gradually increases and the c-axis transport crosses over from incoherent to metallic, implying the onset of three-dimensional conductivity at low T. These measurements reveal that thenonmetallic behavior of rho(c) (T) in underdoped cuprates is not universal. [S0163-1829(97)50242-6].