Multiband effect in the noncentrosymmetric superconductors Mg12−δIr19B16 revealed by Hall effect and magnetoresistance measurements
Gang Mu, Huan Yang, Hai-Hu Wen
DOI 10.1103/PhysRevB.82.052501 · Physical Review B
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Abstract
We report the longitudinal resistivity and Hall effect measurements on the noncentrosymmetric superconducting Mg12−δIr19B16 samples with different critical transition temperatures. A strong temperature dependence of the Hall coefficient RH and nonlinear magnetic field dependence of the Hall resistivity ρxy in wide temperature region are observed, suggesting a strong multiband effect in this system. Moreover, a large magnetoresistance up to 20% is found at the field of 9 T. We also observe the violation of the Kohler’s rule from our magnetoresistance data, further confirming the presence of multiband effect in our samples. A detailed analysis shows that the data cannot be simply described within the two-band scenario at low temperatures so we argue that there may be more than two bands contributing to the conduction of the samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Mg12-δIr19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | onset |
| Mg12-δIr19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure not reported | onset |
| Mg12-δIr19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.7 | Pressure not reported | onset |
| Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Li2Pd3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Mg10Ir19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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