Thermal transport inYBa2Cu3

C. P. Popoviciu

¹

,

J. L. Cohn

²

Oxygen-Doping Dependence of Thermal Conductivity Measurements in EuBa2Cu3O7??

“…k e (%) was calculated at an environmental temperature of 292 K and at temperatures near T c , the maximum calculated k e value is 3.7%, corresponding to the maximum metastable oxygen concentration achieved in the samples, 7--d = 6.96, meanwhile the most resistive sample, with 7--d = 6.31, is Mottinsulator's type [9] and k e has an insignificant value to low temperatures. These results are similar, within the order of magnitude, to those reported for Y123 [10,11,14].…”

“…In some way, these types of effects are reflected in thermal conductivity, inasmuch as this physical property is highly sensitive to the succeeding interactions. Both the normal state transport and superconducting properties are very sensitive to the oxygen concentration in the chain layers and, apparently, to the oxygen ordering [5,10,11].…”

Anisotropic in-plane thermal conductivity of single-crystalYBa2Cu4OCohn1, Karpiński2 1998Phys. Rev. BSelf Cite6050View full textAdd to dashboardCite

“…The ⌫ values agree with those found for twinned Y-123 at similar p values, 10 indicating that for the regime investigated here (pр0.11), ⌫ is largely determined by the change in scattering that occurs in the CuO 2 planes. That ⌫ a is larger for Al-free specimen 315 than for specimen 259 is consistent with the higher mobile hole concentration in the planes of the former.…”

“…9, 10 We define the enhancement as 10 ⌫ϵϪd( s / n )/dt͉ t→1 , the reduced temperature derivative of the superconducting to normalstate thermal conductivity ratio near T c . n is determined by a polynomial extrapolation of the normal-state data just below T c as shown in Fig.…”

OXYGEN-DOPING DEPENDENCE OF THERMOELECTRIC POWER AND THERMAL CONDUCTIVITY MEASUREMENTS IN EuBa2Cu3O7-δ

“…In the same figure we can see that the sample with the high oxygen content is not the sample with the higher K{8) value, per example. This performance is very interesting and an acceptable explanation could be given in the context of that thermal conductivity not only depends on temperature and oxygen content, through the charge carriers and phonons and theirs interactions, but apparently it could depend too on the oxygen ordering 16,19 .…”