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. 2015 Oct 13;5:15097. doi: 10.1038/srep15097

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Copyright © 2015, Macmillan Publishers Limited

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(a) Current-voltage characteristics of a SQUID probe without mechanical polishing at T = (i) 3.6, (ii) 3.8. (iii) 4.0, (iv) 4.2, (v) 5.0, (vi) 5.2, (vii) 5.4, (viii) 5.6, (ix) 5.8, (x) 6.0, (xi) 6.2, (xii) 6.4, (xiii) 6.6, (xiv) 6.8 K. The current was swept for both negative and positive directions, and no hysteresis in the I-V characteristics was observed. (b) Current-voltage characteristics of a SQUID probe after mechanical polishing at T = (i) 3.6, (ii) 3.8. (iii) 4.0, (iv) 4.2, (v) 5.0, (vi) 5.2, (vii) 5.4, (viii) 5.6, (ix) 5.8, (x) 6.0, (xi) 6.2 K. No hysteresis in the I-V characteristics was observed.