Veiga, LSI; Mardegan, JRL; Zimmermann, MV; Maimone, DT; Carneiro, FB; Fontes, MB; Strempfer, J; ... Bittar, EM; + view all Veiga, LSI; Mardegan, JRL; Zimmermann, MV; Maimone, DT; Carneiro, FB; Fontes, MB; Strempfer, J; Granado, E; Pagliuso, PG; Bittar, EM; - view fewer (2020) Possible quantum fluctuations in the vicinity of the quantum critical point of (Sr,Ca)3Ir4Sn13 revealed by high-energy x-ray diffraction. Physical Review B , 101 (10) , Article 104511. 10.1103/physrevb.101.104511.

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Abstract

We explore the evolution of the structural phase transition of ( Sr , Ca ) 3 Ir 4 Sn 13 , a model system to study the interplay between structural quantum criticality and superconductivity, by means of high-energy x-ray diffraction measurements at high pressures and low temperatures. Our results confirm a rapid suppression of the superlattice transition temperature T ∗ against pressure, which extrapolates to zero at a critical pressure of ≈ 1.79 ( 4 ) GPa . The temperature evolution of the superlattice Bragg peak in Ca 3 Ir 4 Sn 13 reveals a drastic decrease of the intensity and an increase of the linewidth when T → 0 K and p → p c . Such anomaly is likely associated with the emergence of quantum fluctuations that disrupt the formation of long-range superlattice modulation. The revisited temperature-pressure phase diagram of ( Sr , Ca ) 3 Ir 4 Sn 13 thus highlights the intertwined nature of the distinct order parameters present in this system and demonstrates some similarities between this family and the unconventional superconductors.

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