arXiv subjects

M. Springford

Publications and source records attributed to M. Springford.

3 recordsLinked to original sources

arXiv2001

Superconducting Fluctuations and the Reduced Dimensionality of the Organic Superconductor $κ$- (BEDT-TTF)$_{2}$Cu(NCS)$_{2}$ as Observed through Measurements of the de Haas-van Alphen Effect

We report measurements of the de Haas-van Alphen (DHVA) effect and AC susceptibility in the layered organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu(NCS)$_{2}$. The amplitude of the DHVA oscillations is attenuated over a wide field range above the irreversibility line, B_irr(B), below which a rigid flux lattice is formed. Thus the DHVA effect provides a unique probe of the superconducting fluctuations at high fields in this material. We compare our measurements with other determinations of the superconducting phase diagram of $κ$-(BEDT-TTF)$_{2}$Cu(NCS)$_{2}$.

cond-mat.supr-con↗

arXiv2000

Comment on "High Field Quasiparticle Tunneling in Bi_2Sr_2CaCu_2O_{8+δ} : Negative Magnetoresistance in the Superconducting State" (N.Morozov et al, Phys.Rev. Lett. 84,1784 (2000))

We show that the negative c-axis magnetoresistance in cuprates is the normal state feature.

cond-mat.supr-con↗

arXiv2000

C-axis negative magnetoresistance and upper critical field of Bi2Sr2CaCu2O8

The out-of-plane resistance and the resistive upper critical field of BSCCO-2212 single crystals with Tc=91-93 K have been measured in magnetic fields up to 50 T over a wide temperature range. The results are characterised by a positive linear magnetoresistance in the superconducting state and a negative linear magnetoresistance in the normal state. The zero field normal state c-axis resistance, the negative linear normal state magnetoresistance, and the divergent upper critical field Hc2(T)are explained in the framework of the bipolaron theory of superconductivity.

cond-mat.supr-con↗