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| Journal Article | PUBDB-2020-04327 |
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2020
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevB.101.195135 doi:10.3204/PUBDB-2020-04327
Abstract: We investigate the thermal-driven charge density wave (CDW) transition of two cubic superconducting intermetallic systems Lu(Pt$_{1−x}$Pd$_x$)$_2$In and (Sr$_{1−x}$Ca$_x$)$_3$Ir$_4$Sn$_{13}$ 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 nonthermal 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 the 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.
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