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J. Phys. Soc. Jpn. 75 (2006) 084716 (9 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Basal-Plane Magnetic Anisotropies of High-κ d-Wave Superconductors in a Mixed State: A Quasiclassical Approach

Hiroto Adachi, Predrag Miranović1, Masanori Ichioka and Kazushige Machida

Department of Physics, Okayama University, Okayama 700-8530
1Department of Physics, University of Montenegro, Podgorica 81000, Serbia and Montenegro

(Received May 8, 2006; Accepted June 5, 2006; Published August 10, 2006)

We study the basal-plane anisotropies of reversible magnetization and torque in a mixed state of layered d-wave superconductors based on the quasiclassical version of the BCS–Gor'kov theory. Both the longitudinal magnetization (ML) and torque (τ) show fourfold oscillations as a function of the field angle χ. The relationship between the node position and the oscillatory patterns shown by ML and τ is clarified. It is also shown that the sign of the τ(χ)-oscillation does not change between Hc1 and Hc2, while the sign of the ML (χ)-oscillation changes. The newly obtained result for τ indicates that the torque experiment can allow us to detect the in-plane anisotropies of Hc2 even in a material with strong fluctuations such as cuprate or organic superconductors, where the Hc2 itself cannot be determined experimentally. ©2006 The Physical Society of Japan

KEYWORDS: d-wave superconductor, mixed state, magnetization, torque, in-plane anisotropy
URL: http://jpsj.ipap.jp/link?JPSJ/75/084716/
DOI: 10.1143/JPSJ.75.084716


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