Average kinetic energy density of Cooper pairs above <script type="math/tex">T_{c}</script> in <script type="math/tex">YBa_{2}Cu_{3}O_{7-x}</script>, <script type="math/tex">Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}</script>, and Nb

Salem-Sugui, S., Jr.; Doria, Mauro M.; Alvarenga, A.D.; Vieira, V.N.; Farinas, P.F.; Sinnecker, J.P.

doi:10.1103/PHYSREVB.76.132502

Title

Average kinetic energy density of Cooper pairs above $T_{c}$ in $YBa_{2}Cu_{3}O_{7-x}$ , $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}$ , and Nb

Author

Salem-Sugui, S., Jr.

Doria, Mauro M.

Alvarenga, A.D.

Vieira, V.N.

Farinas, P.F.

Sinnecker, J.P.

Abstract

We have obtained isofield curves for the square root of the average kinetic energy density of the superconducting state for three single crystals of underdoped YBa(2)Cu(3)O(7-x), an optimally doped single crystal of Bi(2)Sr(2)CaCu(2)O(8+delta), and Nb. These curves, determined from isofield magnetization versus temperature measurements and the virial theorem of superconductivity, probe the order parameter amplitude near the upper critical field. The striking differences between the Nb and the high-T(c) curves clearly indicate for the latter cases the presence of a unique superconducting condensate below and above T(c).

Language

English

Source (journal)

Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015

Publication

Lancaster, Pa : 2007

ISSN

1098-0121 [print]

1550-235X [online]

DOI

10.1103/PHYSREVB.76.132502

Volume/pages