Normal-state magnetotransport in superconducting Tl2Ba2CuO6+δ to millikelvin temperatures
Normal-state magnetotransport in superconducting Tl2Ba2CuO6+δ to millikelvin temperatures
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DOI：
10.1103/physrevb.53.5848
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发表时间：
1996-03
影响因子：
3.7
通讯作者：
A. Mackenzie;S. Julian;D. Sinclair;Chengtian T. Lin
中科院分区：
文献类型：
--
作者：
A. Mackenzie;S. Julian;D. Sinclair;Chengtian T. Lin
We report a study of the normal-state Hall effect and magnetoresistance of single crystals of Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}}. Using samples with {ital T}{sub {ital c}}{lt}15 K, we can suppress the superconductivity down to low temperatures with magnetic fields of 16 T, and can thus study the normal state properties over three decades of temperature, extending into the {ital T}{r_arrow}0 limit where it is possible to make a reliable estimate of {ital k}{sub {ital F}}{approximately}0.7 A{sup {minus}1} from the Hall effect in the elastic-scattering regime. The temperature dependence of the Hall coefficient, {ital R}{sub {ital H}}, below 30 K rules out models in which {ital R}{sub {ital H}}({ital T}) is taken as a measure of a real temperature-dependent change in the carrier concentration. The two scattering rates (probed by the resistivity and the cotangent of the Hall angle) which characterize normal-state transport in the cuprates also appear in this overdoped material for {ital T}{ge}30 K. However, as {ital T}{r_arrow}0, we observe only a {ital single} scattering rate, whose temperature dependence is dominated by low power terms, in contrast to the {ital T}{sup 2} dependence predicted for a Fermi liquid. The relationship between these findings and anomalous behavior previously reported formore » the upper critical field is discussed. {copyright} {ital 1996 The American Physical Society.}« less
We report a study of the normal-state Hall effect and magnetoresistance of single crystals of Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}}. Using samples with {ital T}{sub {ital c}}{lt}15 K, we can suppress the superconductivity down to low temperatures with magnetic fields of 16 T, and can thus study the normal state properties over three decades of temperature, extending into the {ital T}{r_arrow}0 limit where it is possible to make a reliable estimate of {ital k}{sub {ital F}}{approximately}0.7 A{sup {minus}1} from the Hall effect in the elastic-scattering regime. The temperature dependence of the Hall coefficient, {ital R}{sub {ital H}}, below 30 K rules out models in which {ital R}{sub {ital H}}({ital T}) is taken as a measure of a real temperature-dependent change in the carrier concentration. The two scattering rates (probed by the resistivity and the cotangent of the Hall angle) which characterize normal-state transport in the cuprates also appear in this overdoped material for {ital T}{ge}30 K. However, as {ital T}{r_arrow}0, we observe only a {ital single} scattering rate, whose temperature dependence is dominated by low power terms, in contrast to the {ital T}{sup 2} dependence predicted for a Fermi liquid. The relationship between these findings and anomalous behavior previously reported formore » the upper critical field is discussed. {copyright} {ital 1996 The American Physical Society.}« less