Modulation-doped-semiconductorlike behavior manifested in magnetotransport measurements of LixZrNCl layered superconductors
T. Takano, A. Kitora, Y. Taguchi, Y. Iwasa
DOI 10.1103/PhysRevB.77.104518 · Physical Review B
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Abstract
Transport properties in magnetic fields have been investigated for possibly exotic LixZrNCl superconductors with a wide range of doping concentration of 0.06⩽x⩽0.37. Application of magnetic field along c axis rapidly suppressed the superconducting transition temperature (Tc) while strongly broadening the width. Zero-temperature limit of upper critical field [Hc2(0)] showed systematic and monotonic decrease upon increasing x. Detailed analysis with a phenomenological argument gave a simple relation of kFL∝x and almost x-independent μ (kF, L, and μ denote Fermi wave number, mean free path, and carrier mobility, respectively). These results combined with the temperature-independent Hall coefficient clearly indicate that the present system can be viewed as modulation-doped semiconductors in which conduction electrons suffer from minimal disorder scattering. This could be a key to the relatively high-Tc values realized in this class of layered superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Li0.08ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.5 | Pressure not reported | midpoint |
| Li0.37ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure not reported | midpoint |
| LixZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| LixHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.5 | Pressure not reported | unknown |
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