التفاصيل البيبلوغرافية
| العنوان: |
Anomalous relaxation kinetics and charge-density-wave correlations in underdoped BaPb1−xBixO3. |
| المؤلفون: |
Nicoletti, D., Casandruc, E., Fu, D., Giraldo-Gallo, P., Fisher, I. R., Cavalleri, A. |
| المصدر: |
Proceedings of the National Academy of Sciences of the United States of America; 8/22/2017, Vol. 114 Issue 34, p9020-9025, 6p |
| مصطلحات موضوعية: |
CHARGE density waves, RELAXATION kinetics (Chemistry), SUPERCONDUCTIVITY, ABSORPTION, SYMMETRY breaking |
| مستخلص: |
Superconductivity often emerges in proximity of other symmetry-breaking ground states, such as antiferromagnetism or charge-density-wave (CDW) order. However, the subtle interrelation of these phases remains poorly understood, and in some cases even the existence of short-range correlations for superconducting compositions is uncertain. In such circumstances, ultrafast experiments can provide new insights by tracking the relaxation kinetics following excitation at frequencies related to the broken-symmetry state. Here, we investigate the transient terahertz conductivity of BaPb1−xBixO3––a material for which superconductivity is “adjacent” to a competing CDW phase––after optical excitation tuned to the CDW absorption band. In insulating BaBiO3 we observed an increase in conductivity and a subsequent relaxation, which are consistent with quasiparticles injection across a rigid semiconducting gap. In the doped compound BaBi0.72Pb0.28O3 (superconducting below TC = 7 K), a similar response was also found immediately above TC. This observation evidences the presence of a robust gap up to T ≃" role="presentation">≃ [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
