TY - JOUR
T1 - On the anomalous magnetic behaviors of high-Tc oxides
AU - Sato, M.
AU - Shamoto, S.
AU - Sera, M.
AU - Fujishita, H.
N1 - Funding Information:
crystal of Nd-Ce-Cu-O system by Hidaka and Suzuki 11) seems to have an anomalous character similar to the case of the Hcl(T) curve shown in Fig. 2(d). It is tempting to speculate that the anomalies stated here present, as Prof. S. Maekawa suggested 12)9 the sign of a new kind of superconducting state which cannot be explained by the simple BCS theory. The anomalies are observed for both magnetic field directions, parallel and perpendicular to the CuO 2 plane, which may exclude some of the models to explain the observed anomalies. In conclusion, we have studied two kinds of anomalies in the magnetic behaviors in detail and found that they have the same origin. They appear below Tc2 (<T c) and seem to exist in common to all high-T c oxides. Acknowledgments --The authors are greatly indebted to Profs. S. Maekawa and T. Matsuura of Nagoya University, Prof. M. Imada of Saitama University and Prof. H. Fukuyama of Tokyo University for their stimulating discussion. They thank Prof. K. Kume of Tokyo Metropolitan University for sending the preprint on their NQR result. This work is supported by Grant-in-Aid for Scientific Research on Priority Areas of the Ministry of Education, Science and Culture.
PY - 1989/11
Y1 - 1989/11
N2 - Lower critical fields Hcl of sintered samples of high-Tc Cu oxides have been measured as a function of temperature T. The diamagnetic moments M of the La2-xSrxCuO4 samples and a crystal specimen of YBa2Cu3O7-δ have also been measured in detail after cooling in the applied magnetic field H, with constant H and with increasing T. The T-dependence of Hcl has been found to be quite anomalous. The plot of |M| against H at constant T is also anomalous, that is, at low temperatures |M| increases with H in the very high field region far above Hcl. It is observed in both field directions, parallel and perpendicular to the CuO2 plane. These two kinds of anomalies are found to have the same origin. They may indicate the existence of the significant difference of the superconducting properties between the high-Tc oxides and usual superconductors.
AB - Lower critical fields Hcl of sintered samples of high-Tc Cu oxides have been measured as a function of temperature T. The diamagnetic moments M of the La2-xSrxCuO4 samples and a crystal specimen of YBa2Cu3O7-δ have also been measured in detail after cooling in the applied magnetic field H, with constant H and with increasing T. The T-dependence of Hcl has been found to be quite anomalous. The plot of |M| against H at constant T is also anomalous, that is, at low temperatures |M| increases with H in the very high field region far above Hcl. It is observed in both field directions, parallel and perpendicular to the CuO2 plane. These two kinds of anomalies are found to have the same origin. They may indicate the existence of the significant difference of the superconducting properties between the high-Tc oxides and usual superconductors.
UR - https://www.scopus.com/pages/publications/0024766015
UR - https://www.scopus.com/pages/publications/0024766015#tab=citedBy
U2 - 10.1016/0038-1098(89)90675-3
DO - 10.1016/0038-1098(89)90675-3
M3 - Article
AN - SCOPUS:0024766015
SN - 0038-1098
VL - 72
SP - 689
EP - 695
JO - Solid State Communications
JF - Solid State Communications
IS - 7
ER -