Transport Study on Overdoped TlBa2CUO6+δ Single Crystal

1992 ◽  
Vol 275 ◽  
Author(s):  
Takashi Manako ◽  
Yuichi Shimakawa ◽  
Yoshimi Kubo
Keyword(s):  
Single Crystal ◽  
Temperature Dependence ◽  
Hall Coefficient ◽  
Hall Mobility ◽  
Fermi Liquid ◽  
Flux Method ◽  
Scattering Rate ◽  
Out Of Plane ◽  
Temperature Dependences ◽  
Characteristic Maximum

ABSTRACTTl2Ba2Cuo6+δ(T1-2201) single crystals are prepared by a KCI flux method. In-plane and out-of plane resistivities (ρabρc as well as the in-plane Hall coefficient are measured for the single crystal samples with various 7c's. The ρc values are as large as ∼10−1 Ω cm, which is larger than that of YBa2Cu3O7, but smaller than that of Bi2Sr2CaCu2O8. Temperature dependences of ρc show metallic behaviors for both normal metallic and 75-K superconducting samples. Temperature dependence of in-plane resistivity par changes from ∼T2 to ∼T1 with increasing Tc In-plane Hall coefficient RH shows a characteristic maximum at about 100 K for all samples. Although both ρab and RH have rather a complicated temperature dependence, inverse Hall mobility μH(=ρab/RH always exhibits clear T2 dependence for all samples. These results suggest that the intrinsic scattering rate of this material varies as ∼T2, just like in an ordinary Fermi liquid, and that the carrier concentration actually changes with temperature like that observed in nH(=1/RHe).

scholarly journals Hidden non-Fermi liquid behavior caused by magnetic phase transition in Ni-doped Ba-122 pnictides

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Seokbae Lee ◽  
Ki-Young Choi ◽  
Eilho Jung ◽  
Seulki Roh ◽  
Soohyeon Shin ◽  
...  
Keyword(s):  
Phase Transition ◽  
Temperature Dependence ◽  
Magnetic Phase Transition ◽  
Fermi Liquid ◽  
Magnetic Phase ◽  
Linear Temperature Dependence ◽  
Scattering Rate ◽  
Underdoped Sample ◽  
Liquid Behavior ◽  
Fermi Liquid Behavior

Abstract We studied two BaFe2−x Ni x As2 (Ni-doped Ba-122) single crystals at two different doping levels (underdoped and optimally doped) using an optical spectroscopic technique. The underdoped sample shows a magnetic phase transition around 80 K. We analyze the data with a Drude-Lorentz model with two Drude components (D1 and D2). It is known that the narrow D1 component originates from electron carriers in the electron-pockets and the broad D2 mode is from hole carriers in the hole-pockets. While the plasma frequencies of both Drude components and the static scattering rate of the broad D2 component show negligible temperature dependencies, the static scattering rate of the D1 mode shows strong temperature dependence for the both samples. We observed a hidden quasi-linear temperature dependence in the scattering rate of the D1 mode above and below the magnetic transition temperature while in the optimally doped sample the scattering rate shows a more quadratic temperature dependence. The hidden non-Fermi liquid behavior in the underdoped sample seems to be related to the magnetic phase of the material.

Temperature dependence of Hall mobility in a single crystal of the organic semiconductor BTQBT

1995 ◽  
Vol 5 (6) ◽  
pp. 861 ◽  
Author(s):  
Kenichi Imaeda ◽  
Yongfang Li ◽  
Yoshiro Yamashita ◽  
Hiroo Inokuchi ◽  
Mizuka Sano
Keyword(s):  
Single Crystal ◽  
Temperature Dependence ◽  
Organic Semiconductor ◽  
Hall Mobility

Temperature dependences of anisotropic resistivity in the a−b plane and Hall coefficient in a single-crystal Bi2Sr2CaCu2Oy

1991 ◽  
Vol 176 (1-3) ◽  
pp. 209-215 ◽  
Author(s):  
Tatsuya Honma ◽  
Kazuhiko Yamaya ◽  
Fujio Minami ◽  
Shunji Takekawa
Keyword(s):  
Single Crystal ◽  
Hall Coefficient ◽  
Temperature Dependences

scholarly journals Influence of Ag2Te on Transport Properties of (AgS-bTe2)0.9(PbTe)0.1

2021 ◽  
Vol 66 (11) ◽  
pp. 983
Author(s):  
S.S. Ragimov ◽  
M.A. Musayev ◽  
N.N. Hashimova
Keyword(s):  
Electrical Conductivity ◽  
Differential Scanning Calorimetry ◽  
Temperature Dependence ◽  
Transport Properties ◽  
Thermoelectric Power ◽  
Temperature Interval ◽  
Hall Coefficient ◽  
Scanning Calorimetry ◽  
Maximum Value ◽  
Temperature Dependences

The transport properties of (AgSbTe2)0.9(PbTe)0.1, namely, the electrical conductivity and the Seebeck (S) and Hall (RH) coefficients, are studied in the temperature interval 80–560 K. An endothermic peak at 410 K is found by the differential scanning calorimetry (DSC). Sharp changes in the temperature dependences of the electrical conductivity and thermoelectric power in the region near 410 K are observed. The temperature dependence of Hall coefficient passes through maximum at ∼200 K and has negative sign. It is shown that, these peculiarities are due to the presence of the Ag2Te phase. The thermoelectric Z-factor has the maximum value of 2.7 × 10−3 K−1 at 400 K.

Synthesis and Thermoelectric Properties of NaxCo2O4 Single Crystals

2005 ◽  
Vol 886 ◽  
Author(s):  
Jian He ◽  
Kelvin Aaron ◽  
Edward Abbott ◽  
Joseph Kolis ◽  
Terry M. Tritt
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Low Temperature ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Free Path ◽  
Mean Free Path ◽  
Flux Method ◽  
Different Types

ABSTRACTSingle crystal NaCo2O4 platelets with sizes up to 6mm were synthesized by the typical high temperature NaCl flux method. The in-plane thermopower α and in-plane resistivity ρ were measured to be ∼100µV/K and 0.3mΩ-cm at 300K, respectively. The in-plane thermal conductivity κ was measured by our custom-designed “PTC” system and found to be ∼5 W-m−1K−1 at 300K, which is 2-3 times larger than the polycrystalline NaCo2O4. The in-plane phonon mean free path lph was estimated to be ∼9.5Å, which is much smaller than the in-plane mean free path of conducting carriers (la∼51Å). A novel low temperature flux method where NaCl/NaOH was used as flux and metallic Co powders as Co source was developed to successfully synthesize Na-deficient NaxCo2O4 crystals with size up to 6mm at low temperature of 550°C. The different temperature dependence in resistivity reveals that two different types of crystals can exist, one is metallic and another is semiconducting. The temperature dependence of the measured k is like that of a disordered solid and the value is found to be ∼7 W-m−1K−1 at 300K.

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