Low-temperature electronic specific heat of La2−xSrxCuO4 and La2−xSrxCu1−yZnyO4. Evidence for a d wave superconductor

✍ Scribed by N. Momono; M. Ido; T. Nakano; M. Oda; Y. Okajima; K. Yamaya

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 602 KB
• Volume: 233
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90768-4

✦ Synopsis

The electronic specific heat C,, was studied at T5 10 K both on La2_,SrxCu04 samples and on La,_G!ir,Cu, _,Zn,O, samples below and above yc at which the superconductivity disappears. In superconducting La,_$r,CuO, samples, the C,, contains only a T2 component at T<< T, in a x range between 0.14 and 0.22, suggesting a gapless superconductor with line nodes. A T linear component of C,, appears in superconducting I+_~r,Cu,_,Zn,O, (y<y,) samples, and its coefficient, y, increases markedly with Zn content. In samples with various Zn contents, the relation between T,/T,(y=O) and y/y(y;r y,) can be understood in terms of strong impurity scattering in a d wave superconductor.