QUASI-PARTICLE MEAN FREE-PATH IN YBA2CU3O7 MEASURED BY THE THERMAL HALL CONDUCTIVITY
QUASI-PARTICLE MEAN FREE-PATH IN YBA2CU3O7 MEASURED BY THE THERMAL HALL CONDUCTIVITY
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DOI：
10.1103/physrevlett.75.3529
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发表时间：
1995-11-06
影响因子：
8.6
通讯作者：
ONG, NP
中科院分区：
文献类型：
--
作者：
KRISHANA, K;HARRIS, JM;ONG, NP
准粒子在YBa_2Cu_3O_7中被钉扎涡旋的非对称散射在混合态中产生了异常大的霍尔热导率kappa（xy）。在高场下，kappa（xy）与holded分布显示出强曲率，这使得准粒子的零场平均自由程l（0）得以确定。我们发现，l（0）经历了一个显着的增加，从90 K附近的90埃到2500埃在15 K。在90 ~ 75 K之间，散射率变化为3倍.我们讨论的散射机制的影响。从kappa（xy）和l（0）出发，得到了面内准粒子热导率的一个新的估计.
Asymmetric scattering of quasiparticles by pinned vortices in YBa2Cu3O7 produces an unusually large thermal Hall conductivity kappa(xy) in the mixed state. In high fields, the kappa(xy) vs held profile displays strong curvature, which allows the zero-field mean free path l(0) of the quasiparticles to be determined. We find that l(0) undergoes a remarkable increase from 90 Angstrom near 90 K to 2500 Angstrom at 15 K. The scattering rate changes by a factor of 3 between 90 and 75 K. We discuss implications for the scattering mechanism. From kappa(xy) and l(0), we obtain a new estimate of the thermal conductivity of inplane quasiparticles.