ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have performed measurements of the a-b plane longitudinal and transverse magnetization anisotropy on an untwinned, high quality single crystal of LuBa2Cu3O7−x in magnetic fields below Hc1 as a function of temperature, from 2 K to the transition temperature and the angle between the field and a fixed direction in the a-b plane. When the superconducting order parameter has nodes on the Fermi surface, such as the case of the spin-singlet dx2−y2 order parameter, nonlinear effects associated with low-energy quasiparticles should become important.1 It was pointed out by Yip and Sauls that these effects will be most important at low temperatures. They should be observable in a measurement of the anisotropy of the magnetization or the magnetic torque. The magnetization is predicted to develop an anisotropic component transverse to the applied field. Anisotropic transverse magnetization with dx2−y2 symmetry is not seen in the temperature regime 5 to 25 K. Our results set stringent limits on the anisotropy of the transverse magnetization in this range. Within the resolution of our experiment no evidence for d-wave pairing is observed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.355396
