تقرير
Unveiling charge density wave quantum phase transitions by x-ray diffraction
| العنوان: | Unveiling charge density wave quantum phase transitions by x-ray diffraction |
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| المؤلفون: | Carneiro, F. B., Veiga, L. S. I., Mardegan, J. R. L., Khan, R., Macchiutti, C., Lopez, A., Bittar, E. M. |
| المصدر: | Phys. Rev. B 101, 195135 (2020) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science, Condensed Matter - Superconductivity |
| الوصف: | We investigate the thermal-driven charge density wave (CDW) transition of two cubic superconducting intermetallic systems Lu(Pt1-xPdx)2In and (Sr1-xCax)3Ir4Sn13 by means of x-ray diffraction technique. A detailed analysis of the CDW modulation superlattice peaks as function of temperature is performed for both systems as the CDW transition temperature T_CDW is suppressed to zero by an non-thermal control parameter. Our results indicate an interesting crossover of the classical thermal-driven CDW order parameter critical exponent from a three-dimensional universality class to a mean-field tendency, as T_CDW vanishes. Such behavior might be associated with presence of quantum fluctuations which influences the classical second-order phase transition, strongly suggesting the presence of a quantum critical point (QCP) at T_CDW = 0. This also provides experimental evidence that the effective dimensionality exceeds its upper critical dimension due to a quantum phase transition. Comment: 5 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.101.195135 |
| URL الوصول: | http://arxiv.org/abs/1912.05669 |
| رقم الأكسشن: | edsarx.1912.05669 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.101.195135 |
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