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首页> 外文期刊>Physical review >Crossover In Charge Transport From One-dimensional Copper-oxygen Chains To Two-dimensionalladders In (la,y)_y(sr,ca)_(14-y)cu_(24)o_(41)
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Crossover In Charge Transport From One-dimensional Copper-oxygen Chains To Two-dimensionalladders In (la,y)_y(sr,ca)_(14-y)cu_(24)o_(41)

机译：在（la，y）_y（sr，ca）_（14-y）cu_（24）o_（41）中从一维铜氧链到二维梯子的电荷传输交叉

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摘要

The charge transport in the copper-oxygen chain/ladder layers of (La, Y)_y(Sr,Ca)_(14-y)Cu_(24)O_(41) is investigated along two crystallographic directions in the temperature range from 50 to 700 K and for doping levels from y ≈ 6 (number of holes n_h< 1) to y=0 (number of holes n_h=6). A crossover from a one-dimensional hopping transport along the chains for y s 3 to a quasi-two-dimensional charge conduction in the ladder planes for y approx< 2 is observed. This is attributed to a partial hole transfer from chains to ladders when the hole doping exceeds n_h≈4 and approaches fully doped value n_h=6. For y approx< 2 a weak dielectric relaxation at radio frequencies and a microwave mode are detected, which might be recognized as signatures of a charge-density wave phase developed at short length scales in the ladder planes.
机译：研究了在（La，Y）_y（Sr，Ca）_（14-y）Cu_（24）O_（41）的铜氧链/梯子层中的电荷传输沿温度在50范围内的两个晶体学方向掺杂浓度从y≈6（空穴数n_h <1）到y = 0（空穴数n_h = 6），最高为700K。观察到从沿着y s 3的链的一维跳跃传输到在y约<2的梯形平面中的准二维电荷传导的交叉。这归因于当空穴掺杂超过n_h≈4并且接近完全掺杂值n_h = 6时，从链到梯子的部分空穴转移。对于y大约<2，检测到射频和微波模式下的弱介电弛豫，这可能被认为是在梯形平面上以短长度标度产生的电荷密度波相的特征。

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