Gap like structure in a nonsuperconducting layered oxycarbonate Bi$_{2+x}$Sr$_{4-x}$Cu$_2$CO$_3$O$_{8+δ}$ single crystal

S. I. Vedeneev; B. A. Piot; D. K. Maude

doi:10.1016/j.physc.2012.06.010

paper

Gap like structure in a nonsuperconducting layered oxycarbonate Bi $_{2 + x}$ Sr $_{4 - x}$ Cu $_{2}$ CO $_{3}$ O $_{8 + δ}$ single crystal

arXiv:1204.2919 · doi:10.1016/j.physc.2012.06.010

Abstract

The magnetic field and temperature dependence of the in-plane tunneling conductance $d I / d V (V)$ in high-quality nonsuperconducting (down to 10 mK) layered oxycarbonate Bi $_{2 + x}$ Sr $_{4 - x}$ Cu $_{2}$ CO $_{3}$ O $_{8 + δ}$ single crystals has been investigated using break junctions. Combining measurements of the in-plane magnetoresistivity $ρ_{ab} (T, H)$ and the magnetotunneling, we present evidence for the existence of a small "pseudogap" in a nonsuperconducting cuprate, without local incoherent pairs or any correlation phenomena associated with superconductivity. We are unable to distinguish if such a "pseudogap" is totally unrelated to superconductivity or if its existence is a necessary condition for the subsequent occurrence of superconductivity with increasing carrier density in the sample.

Gap like structure in a nonsuperconducting layered oxycarbonate Bi2+x​Sr4−x​Cu2​CO3​O8+δ​ single crystal

Abstract

References in corpus (6)

Gap like structure in a nonsuperconducting layered oxycarbonate Bi $_{2 + x}$ Sr $_{4 - x}$ Cu $_{2}$ CO $_{3}$ O $_{8 + δ}$ single crystal