We measured the magnetoresistance as a function of temperature down to 20 mK and magnetic field for a set of underdoped Pr1.88Ce0.12CuO4− thin films with controlled oxygen content. This allows us to access the edge of the superconducting dome on the underdoped side. The sheet resistance increases with increasing oxygen content whereas the superconducting transition temperature is steadily decre...

We have investigated the weak localization correction to magnetoresistance in one to six layer graphene structures. The magnetoresistance measurements have revealed that, in addition to the known transition from weak anti-localization in monolayer graphene to weak localization in bilayer graphene, the weak localization effect becomes more pronounced as the number of graphene layers increases. T...

The aim of this work is to investigate the effects of 593 MeV Au irradiation using two different projectile charges, namely Au and Au on the structural, transport and magnetization properties of Co/NiFe/Co/Cu multilayers. X-Ray diffraction and extended x-ray absorption fine structures measurements show no significant structural change for as deposited and irradiated multilayers. On the other ha...

The discovery of giant magnetoresistance (GMR) has been a huge impact on our life, especially for mass data storage devices. Initial experiments conducted by Gruberg and Fert are explained. Basic physics of the GMR effect can be explained by the two-current model, which the conduction of a current is consist of two different spin electrons. Details of GMR applications, such as hard-disk read-he...

We report trie transverse magnetoresistance measurements ai ambient

The magnetization reversal phenomenon in a submicron magnetic wire with a trilayer structure consisting of NiFe~400 Å!/Cu~200 Å!/NiFe~50 Å! was investigated by measuring the electric resistance in external magnetic fields. It is shown that the magnetization reversal can be very sensitively investigated by utilizing the giant magnetoresistance effect. The time variation of resistance during the ...

We present magnetoresistive organic field-effect transistors featuring ultrasmall magnetic field-effects as well as a sign reversal. The employed material systems are coevaporated thin films with different compositions consisting of the electron donor 2,2',7,7'-tetrakis-(N,N-di-p-methylphenylamino)-9,9'-spirobifluorene (Spiro-TTB) and the electron acceptor 1,4,5,8,9,12-hexaazatriphenylene hexac...

The discovery of extreme magnetoresistance (XMR) in non-magnetic materials attracted attention to the WTe 2 semimetal. We have carried out studies a tungsten ditelluride single crystal magnetic field range up 14 T. Magnetoresistance increased with increasing following near quadratic law without saturation. Shubnikov-de Haas oscillations were observed. Four fundamental frequencies found spectrum...

We propose a size effect which leads to the negative magnetoresistance in granular metal-insulator materials in which the hopping between two nearest neighbor clusters is the main transport mechanism. We show that the hopping probability increases with magnetic field. This is originated from the level crossing in a few-electron cluster. Thus, the overlap of electronic states of two neighboring ...

Jeong-O Lee el al. [Phy. Rev. B, 61, R16 362 (2000)] reported magnetoresistance and differential conductance measurements of multiwalled carbon nanotubes. The observed aperiodic conductance fluctuations and the negative magnetoresistance was interpreted to originate exclusively from changes in the density of states at the Fermi energy. We show that this interpretation is questionable and not su...