Magnetotransport mechanisms in strongly underdoped YBa2Cu3Ox single crystals
نویسندگان
چکیده
We report magnetoresistivity measurements on strongly underdoped YBa2Cu3Ox (x56.25 and 6.36) single crystals in applied magnetic fields Hi c axis. We identify two different contributions to both in-plane Drab /rab and out-of-plane Drc /rc magnetoresistivities. The first contribution has the same sign as the temperature coefficient of the resistivity ] ln ri /]T (i5$c ,ab%). This contribution reflects the incoherent nature of the out-of-plane transport. The second contribution is positive, quadratic in field, with an onset temperature that correlates to the antiferromagnetic ordering.
منابع مشابه
Magnetoconductivity due to quantum interference in strongly underdoped YBa2Cu3Ox
We report magnetoconductivity measurements on YBa2Cu3Ox (x56.25 and 6.36) single crystals. Our main result is that both the in-plane Dsab and out-of-plane Dsc magnetoconductivities exhibit the field dependence characteristic of ‘‘two-dimensional’’ quantum interference in applied magnetic fields Huuc . Namely, Dsc ,ab }ln H/H0.0, with Dsc /sc substantially greater than Dsab /sab . We interpret t...
متن کاملPressure-induced enhancement of the critical current density in superconducting YBa2Cu3Ox bicrystalline rings
The dependence of the critical current density Jc T on hydrostatic He-gas pressure to 0.6 GPa is determined for nearly optimally doped and strongly underdoped melt-textured YBa2Cu3Ox bicrystalline rings containing single 001 -tilt grain boundaries GBs with mismatch angles from 0° to 31°. For all samples with 0°, Jc is found to increase rapidly under pressure, the rate of increase lying predomin...
متن کاملThe underdoped-overdoped transition in YBa2Cu3Ox
The overdoped regime of YBa2Cu3Ox is accessible with heavy oxygen dopings close to x = 7. The crossover from the underdoped to the overdoped regimes occurs around xopt = 6.92, nearly coinciding with a displacive structural phase transition [1]. It is suggesting to associate the structural instability close to optimum doping with a kind of barrier limiting Tc. The 123 bi-layer cuprates exhibit c...
متن کاملContributions to photodoping in oxygen-deficient YBa2Cu3Ox films
We report our studies on the superconducting and normal-state properties of metallic YBa2Cu3Ox thin films (Tc,mid ≈ 52 K) exposed to long-term white-light illumination (photodoping). It was observed that the effects of photoexcitation strongly depended on the temperature at which the photodoping was performed. At low temperatures, both the Hall mobility and the Hall number were photoenhanced, w...
متن کاملSystematic Evolution of the Magnetotransport Properties of Bi2Sr2−xLaxCuO6 with Carrier Concentration
We report that it is possible to obtain a series of high-quality crystals of Bi2Sr2−xLaxCuO6, of which the transport properties have been believed to be “dirtier” than those of other cuprates. In our crystals, the normal-state transport properties display behaviors which are in good accord with other cuprates; for example, in the underdoped region the in-plane resistivity ρab shows the pseudoga...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001