Direct measurement of the London penetration depth in YBa2Cu3O6.92 using low-energy mu SR

Article

关键词: TEMPERATURE-DEPENDENCE;    SPIN-ROTATION;    SUPERCONDUCTORS;    YBA2CU3O7-DELTA;    SURFACE;    CUPRATE;    LATTICE;    STATE;    PSI;   

DOI  :  10.1103/PhysRevB.81.180502

来源: SCIE

【 摘 要 】

A direct measurement of the London penetration depth in the high-T-c superconductor YBa2Cu3O6.92 has been made using low-energy mu SR with an effective background suppression method. The average magnetic field versus mean depth was measured in the Meissner state of high-purity detwinned crystals of YBa2Cu3O6.92. The resulting magnetic field profiles along the a and b axes are consistent with a local London model beyond 10 nm but there are deviations close to the surface. The absolute values of lambda(a) and lambda(b) extrapolated to zero temperature are 126.1 +/- 1.2 +/- 3 and 105.5 +/- 1.0 +/- 3 nm, respectively. These results are compared with other less direct methods and extend the use of low-energy mu SR to small crystals.

【 授权许可】

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