arXiv subjects

Arkady Knizhnik

Publications and source records attributed to Arkady Knizhnik.

2 recordsLinked to original sources

arXiv2005

Universal linear relations between susceptibility and Tc in cuprates

We developed an experimental method for measuring the intrinsic susceptibility χof powder of cuprate superconductors in the zero field limit using a DC-magnetometer. The method is tested with lead spheres. Using this method we determine χfor a number of cuprate families as a function of doping. A universal linear (and not proportionality) relation between Tc and χis found. We suggest possible explanations for this phenomenon.

cond-mat.supr-con↗

arXiv2002

Common energy scale for magnetism and superconductivity in underdoped cuprates: a MuSR investigation of (CaLa)(BaLa)CuO

We characterize the spontaneous magnetic field, and determine the associated temperature Tg, in the superconducting state of Ca(x)La(1-x)Ba(1.75-x)La(0.25+x)Cu(3)O(y) using zero and longitudinal field MuSR measurements for various values of x and y. Our major findings are: (I) Tg and Tc are controlled by the same energy scale, (II) the phase separation between hole poor and hole rich regions is a microscopic one, and (III) spontaneous magnetic fields appear gradually with no moment size evolution.

cond-mat.supr-con↗