Variation of temperature-linear specific heat with doping in (La1−xSrx)2CuO4

✍ Scribed by M. Kato; Y. Maeno; T. Fujita

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 378 KB
• Volume: 152
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(88)90080-9

✦ Synopsis

Low-temperature specific heat of (La~_~rx)2CuO4 has been studied between 2 and 20 K by systematically varying the Sr concentration x, in order to clarify the origin of non-zero y, the temperature-linear specific-heat coefficient, frequently observed in high-To superconducting oxides. Identical procedure is used to prepare samples for the specific-heat measurement and for the determination of the structural, magnetic and superconductive phase-transition temperatures as a function ofx. The value of~, is nearly zero in the antiferromagnetic ordering region, but increases abruptly with x to about 4 mJ/K 2 mol in the insulating, but not antiferromagnetic region. By increasing x further into the superconductive region, 7 tends to be smaller: 1.6 mJ/K 2 mol for x= 0.075. We argue that the non-zero y is not due to inhomogeneity of the samples, but due to electronic origin intrinsic to this system.