superconducting versus a conducting electronic ground state in generality specific double wall carbon and l

two s the authors of this paper doctor team chang and professor pinching or from

the department of physics hong kong university of science and technology

after the discovery of super conductivity and carbon and l two systems theoretical analysis show

in quasi one-dimensional see entities electron film on interaction can offer to potential ground state

super conductivity empires distorted from a conducting state

then all the interaction between electrons becomes the deciding factor and screening of coulomb interaction

is crucial for the appearance of super conductivity and cindy's the super conductivity behaviors usually

a currency into bundles

a single wall c n t is known to be some a conducting and zero

temperature

an interesting question is how about a single metallic double wall carbon and l two

here we consider two of them the three any state and five zero fifteen zero

respectively

the inner tubes with strong electron phone on interaction to provide possibilities of electron for

non related processes and the other tools are metallic so as to provide screening of

coulomb interaction in the inner two

interaction between electrons can have two components

one is the attractive form on mediated coupling

the other is the repulsive coulomb interaction

we estimate the magnitude of the first one from the density function of theory and

the second one is estimated with and without screening of the outer shell for comparison

then we perform second order but normalisation group analysis to identify the system behaviors including

process and the zero temperature ground state

with a single c m t the electric lines spread over on the space

this is the bare climb coupling without screening

however if there is an outer metallic shell the coulomb interaction will be screen and

its strength can be estimated with the random phase approximation

it is about one to two order of magnitude smaller than their potential

with for normalisation group analysis for single wall three and five zero z entities we

get spirals distorted from a conducting ground state in agreement with all the prior theoretical

predictions

in the plots moving from zero to minus infinity along x-axis represents the crawling process

approaching zero temperature

the y-axis denotes the amplitude of different order parameters

black lines to know charge density wave and red lines denote single super conductivity

the charge density wave order is seem to diverge much faster than the superconducting order

in both single wall see entities

when the inner tubes are embedded in d w c entities results are quite different

in both systems

single super conductivity order exceeds charge density weight order in the closing process and this

indicates that zero temperature ground state is superconducting

the crossover temperature of three eight a t w c m t is extremely low

while four five zero and fifteen zero is relatively higher

this may be attributed to the difference in the electron film on coupling strength of

the two systems

the screening due to one or two greatly modifies the ground state

this is the main result of our paper

screening due to the outer shell of d w c m t sufficiently reduces column

interaction between electrons

the results g analysis shows two systems have superconducting ground state

and broaden implication of our result is that most of the metallic d w c

entities can become superconducting at low temperatures in agreement with the experiment