TY - JOUR
T1 - Probing the symmetry of the pairing state of unconventional superconductors by SQUID interferometer measurements
AU - Van Harlingen, D. J.
N1 - Funding Information:
The most direct approach to distinguishing different pairing symmetries is to measure the anisotropy of the phase of the order parameter. The value of this is illustrated in Figure 1, which shows the magnitude and phase of the order parameter vs. k-space angle for candidate states, Whereas the magnitude anisotropy is rather similar for all but the isotropic s-wave state, distinguishable only by * In collaboration with D. M. Ginsberg, A. J. Leggett, D. A. Wollman, and B. D. Yanoff. Research supported by the Science and Technology Center for Superconductivity under grant NSF-DMR-91-20000.
PY - 1997/8
Y1 - 1997/8
N2 - Phase-sensitive SQUID interferometer experiments have emerged as the most powerful technique for determining the symmetry of the pairing state of unconventional superconductors. This approach uses Josephson tunneling to probe specific directions in k-space and long-range phase coherence to measure the phase anisotropy of the order parameter, allowing a direct and definitive determination of the symmetry. Developed for testing the symmetry of the cuprates, corner SQUID and junction experiments indicate a sign change in the order parameter in orthogonal in-plane directions in YBCO, strong evidence for dx2-y2 pairing. Now, this technique is being applied to other classes of superconductors suspected to be unconventional.
AB - Phase-sensitive SQUID interferometer experiments have emerged as the most powerful technique for determining the symmetry of the pairing state of unconventional superconductors. This approach uses Josephson tunneling to probe specific directions in k-space and long-range phase coherence to measure the phase anisotropy of the order parameter, allowing a direct and definitive determination of the symmetry. Developed for testing the symmetry of the cuprates, corner SQUID and junction experiments indicate a sign change in the order parameter in orthogonal in-plane directions in YBCO, strong evidence for dx2-y2 pairing. Now, this technique is being applied to other classes of superconductors suspected to be unconventional.
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U2 - 10.1016/S0921-4534(97)00238-4
DO - 10.1016/S0921-4534(97)00238-4
M3 - Article
AN - SCOPUS:17544404391
SN - 0921-4534
VL - 282-287
SP - 128
EP - 131
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - PART 1
ER -