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DOE OSTI2023

Large-area photon calorimeter with Ir-Pt bilayer transition-edge sensor for the CUPID experiment

CUPID is a next-generation neutrinoless double-β decay experiment that will require cryogenic light detectors to improve background suppression, via the simultaneous readout of heat and light channels from its scintillating crystals. In this work, we showcase light detectors based on an alternative Ir-Pt bilayer transition-edge sensor. We have performed a systematic study to improve the thermal coupling between the photon absorber and the sensor, and thereby its responsivity. Our first devices meet CUPID's baseline noise requirement of < 100 eV rms. Our detectors have risetimes of approximately 180μs and measured timing jitter of < 20μs for the expected signal to noise at the Q value of the decay, which achieves the CUPID's criterion of rejecting two-neutrino double-β decay pile-up events. In conclusion, the current work will inform the fabrication of future devices, culminating in the final TES design and a scaleable readout scheme for CUPID.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗

DOE OSTI2020

Materials Data on IrPt by Materials Project

PtIr crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are three inequivalent Ir sites. In the first Ir site, Ir is bonded to six equivalent Ir and six equivalent Pt atoms to form IrIr6Pt6 cuboctahedra that share corners with twelve IrIr6Pt6 cuboctahedra, edges with twelve IrIr6Pt6 cuboctahedra, edges with twelve equivalent PtIr6Pt6 cuboctahedra, faces with six equivalent IrIr6Pt6 cuboctahedra, and faces with twelve equivalent PtIr6Pt6 cuboctahedra. All Ir–Ir bond lengths are 2.78 Å. All Ir–Pt bond lengths are 2.77 Å. In the second Ir site, Ir is bonded to six equivalent Ir and six Pt atoms to form IrIr6Pt6 cuboctahedra that share corners with five equivalent PtIr6Pt10 cuboctahedra, corners with twelve IrIr6Pt6 cuboctahedra, edges with ten PtIr6Pt6 cuboctahedra, edges with twelve IrIr6Pt6 cuboctahedra, faces with six equivalent IrIr6Pt6 cuboctahedra, and faces with fifteen PtIr6Pt6 cuboctahedra. All Ir–Ir bond lengths are 2.78 Å. All Ir–Pt bond lengths are 2.77 Å. In the third Ir site, Ir is bonded to six equivalent Ir and six Pt atoms to form IrIr6Pt6 cuboctahedra that share corners with five equivalent PtIr6Pt10 cuboctahedra, corners with twelve IrIr6Pt6 cuboctahedra, edges with ten PtIr6Pt6 cuboctahedra, edges with twelve IrIr6Pt6 cuboctahedra, faces with six equivalent IrIr6Pt6 cuboctahedra, and faces with fifteen PtIr6Pt6 cuboctahedra. All Ir–Ir bond lengths are 2.78 Å. All Ir–Pt bond lengths are 2.77 Å. There are two inequivalent Pt sites. In the first Pt site, Pt is bonded to six Ir and six equivalent Pt atoms to form PtIr6Pt6 cuboctahedra that share corners with twelve PtIr6Pt6 cuboctahedra, edges with twelve IrIr6Pt6 cuboctahedra, edges with twelve PtIr6Pt6 cuboctahedra, faces with six equivalent PtIr6Pt6 cuboctahedra, and faces with twelve IrIr6Pt6 cuboctahedra. All Pt–Pt bond lengths are 2.78 Å. In the second Pt site, Pt is bonded to six Ir and ten equivalent Pt atoms to form PtIr6Pt10 cuboctahedra that share corners with ten IrIr6Pt6 cuboctahedra, corners with twelve PtIr6Pt6 cuboctahedra, edges with eight IrIr6Pt6 cuboctahedra, edges with sixteen PtIr6Pt6 cuboctahedra, faces with sixteen equivalent PtIr6Pt10 cuboctahedra, and faces with eighteen IrIr6Pt6 cuboctahedra. There are a spread of Pt–Pt bond distances ranging from 2.78–5.57 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on IrPt3 by Materials Project

Pt3Ir is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ir is bonded to twelve equivalent Pt atoms to form IrPt12 cuboctahedra that share corners with twelve equivalent IrPt12 cuboctahedra, edges with twenty-four equivalent PtIr4Pt8 cuboctahedra, faces with six equivalent IrPt12 cuboctahedra, and faces with twelve equivalent PtIr4Pt8 cuboctahedra. All Ir–Pt bond lengths are 2.79 Å. Pt is bonded to four equivalent Ir and eight equivalent Pt atoms to form PtIr4Pt8 cuboctahedra that share corners with twelve equivalent PtIr4Pt8 cuboctahedra, edges with eight equivalent IrPt12 cuboctahedra, edges with sixteen equivalent PtIr4Pt8 cuboctahedra, faces with four equivalent IrPt12 cuboctahedra, and faces with fourteen equivalent PtIr4Pt8 cuboctahedra. All Pt–Pt bond lengths are 2.79 Å.

36 MATERIALS SCIENCE↗