48 citations · 76 across the 8 of their papers we have counts for
8 papers
Hydrogen-doping mediated solid state thermal switch
Ronald Warzoha, Brian Donovan, Yifei Sun +2
Recent reports reveal that isothermal chemical doping of hydrogen in correlated complex oxides such as perovskite nickelates (e.g. NdNiO3) can induce a metal-to-insulator transitio…
Anisotropic magnetoresistance of bulk carbon nanotube sheets
E. Cimpoiasu, G. A. Levin, B. White +1
We have measured the magnetoresistance of stretched sheets of carbon nanotubes in temperatures ranging from 2 K to 300 K and in magnetic fields up to 9 T, oriented either perpendic…
Aluminum Oxide Layers as Possible Components for Layered Tunnel Barriers
E. Cimpoiasu, S. K. Tolpygo, X. Liu +5
We have studied transport properties of Nb/Al/AlOx/Nb tunnel junctions with ultrathin aluminum oxide layers formed by (i) thermal oxidation and (ii) plasma oxidation, before and af…
Magnetotransport Mechanisms in Strongly Underdoped YBa_2Cu_3O_x Single Crystals
E. Cimpoiasu, G. A. Levin, C. C. Almasan +2
We report magnetoresistivity measurements on strongly underdoped YBa_2Cu_3O_x (x=6.25, 6.36) single crystals in applied magnetic fields H || c-axis. We identify two different contr…
Magnetotransport Properties of Antiferromagnetic YBa_2Cu_3O_6.25 Single Crystals
E. Cimpoiasu, C. C. Almasan, A. P. Paulikas +1
In-plane and out-of-plane magnetoresistivities (MR) of antiferromagnetic YBa_2Cu_3O_6.25 single crystals were measured in magnetic fields H applied along the (ab) plane. In-plane M…
Magnetoconductivity due to Quantum Interference in Strongly Underdoped YBa_2Cu_3O_x
E. Cimpoiasu, G. A. Levin, C. C. Almasan +2
We report magnetoconductivity measurements on YBa_2Cu_3O_x (x=6.25 and 6.36) single crystals. Our main result is that both the in-plane Delta_sigma_ab and out-of-plane Delta_sigma_…
Relationship Between Conductivity and Phase Coherence Length in Cuprates
C. C. Almasan, G. A. Levin, E. Cimpoiasu +7
The large () and strongly temperature dependent resistive anisotropy of cuprates perhaps holds the key to understanding their normal state in-p…
Is There a Unified Description of Conductivity of Layered Cuprates ?
C. C. Almasan, E. Cimpoiasu, G. A. Levin +3
We present a novel approach to the analysis of the normal state in-plane and out-of-plane conductivities of anisotropic layered crystals such as oxygen deficient $…