研究目的
Investigating the evolution of the structural phase transition of (Sr, Ca)3Ir4Sn13 under high pressures and low temperatures to understand the interplay between structural quantum criticality and superconductivity.
研究成果
The study confirms the rapid suppression of the superlattice transition temperature T ? with increasing pressure, extrapolating to zero at a critical pressure of ≈1.79(4) GPa. The anomaly observed in the temperature evolution of the superlattice Bragg peak in Ca3Ir4Sn13 suggests the emergence of quantum fluctuations that disrupt long-range superlattice modulation. The phase diagram highlights the intertwined nature of distinct order parameters in (Sr, Ca)3Ir4Sn13, showing similarities with unconventional superconductors.
研究不足
The study is limited by the experimental constraints of high-pressure and low-temperature measurements, including the resolution of x-ray diffraction techniques and the pressure range achievable with the equipment used.
1：Experimental Design and Method Selection:
High-energy x-ray diffraction measurements were conducted at high pressures and low temperatures to study the structural phase transition.
2：Sample Selection and Data Sources:
Single crystals of (Sr, Ca)3Ir4Sn13 were grown by the flux method. Ambient pressure synchrotron XRD data were collected on single crystals at beamline P09 at PETRA III, DESY. High-pressure single-crystal XRD experiments were performed at the P07 beamline of PETRA III, DESY, and at the XDS beamline of the Brazilian Synchrotron Light Source (LNLS).
3：List of Experimental Equipment and Materials:
High-pressure clamp-type pressure cell, cryomagnet, triple-axis diffractometer, diamond anvil cell (DAC), PerkinElmer detector, Pilatus 300 K detector.
4：Experimental Procedures and Operational Workflow:
Measurements consisted of rocking and 2θ scans collected at several pressures and temperatures. Pressure calibration was determined by measuring the pressure dependence of the orthorhombic splitting of Bragg peaks on La
5：875Ba125CuOData Analysis Methods:
The temperature dependence of the superlattice peak intensity was fitted by a power-law expression to determine the critical exponent and transition temperature.
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