Inverse Isotope Effect in the Ternary Perovskite Hydride SrPdH/D$_{2.9}$: A Signature of Quantum Zero-Point Fluctuations
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arXiv
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2026
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| author | Lu, Wencheng Sahoo, Mihir Lucrezi, Roman Hutcheon, Michael J. Sinha, Shubham Ferreira, Pedro N. Pickard, Chris J. Zhang, Qiang Julian, Matthew N. Prasankumar, Rohit P. Heil, Christoph Strobel, Timothy A. |
| author_facet | Lu, Wencheng Sahoo, Mihir Lucrezi, Roman Hutcheon, Michael J. Sinha, Shubham Ferreira, Pedro N. Pickard, Chris J. Zhang, Qiang Julian, Matthew N. Prasankumar, Rohit P. Heil, Christoph Strobel, Timothy A. |
| contents | Guided by first-principles calculations, we demonstrate superconductivity in the ternary perovskite hydride SrPdH$_{3-x}$, synthesized at low pressure. Structural characterization via neutron diffraction reveals the near-stoichiometric composition SrPdD$_{2.9(2)}$ with 96\% deuterium site occupancy. Subsequent transport and magnetic susceptibility measurements establish onset superconducting transitions at $T_\text{c} = \SI{2.1}{K} $ (H) and $T_\text{c} = \SI{2.2}{K} $ (D), exhibiting an inverse isotope effect that our first-principles calculations attribute predominantly to quantum zero-point motion. The excellent agreement between theory and experiment with respect to thermodynamic stability and superconducting properties provides important validation for theory-guided superconductor discovery. This work establishes superconductivity in the perovskite hydride structural prototype -- expanding the limited family of experimentally realized ternary hydride superconductors -- and demonstrates the importance of quantum nuclear motion on the accurate theoretical treatment of low-pressure hydride superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_23691 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inverse Isotope Effect in the Ternary Perovskite Hydride SrPdH/D$_{2.9}$: A Signature of Quantum Zero-Point Fluctuations Lu, Wencheng Sahoo, Mihir Lucrezi, Roman Hutcheon, Michael J. Sinha, Shubham Ferreira, Pedro N. Pickard, Chris J. Zhang, Qiang Julian, Matthew N. Prasankumar, Rohit P. Heil, Christoph Strobel, Timothy A. Superconductivity Guided by first-principles calculations, we demonstrate superconductivity in the ternary perovskite hydride SrPdH$_{3-x}$, synthesized at low pressure. Structural characterization via neutron diffraction reveals the near-stoichiometric composition SrPdD$_{2.9(2)}$ with 96\% deuterium site occupancy. Subsequent transport and magnetic susceptibility measurements establish onset superconducting transitions at $T_\text{c} = \SI{2.1}{K} $ (H) and $T_\text{c} = \SI{2.2}{K} $ (D), exhibiting an inverse isotope effect that our first-principles calculations attribute predominantly to quantum zero-point motion. The excellent agreement between theory and experiment with respect to thermodynamic stability and superconducting properties provides important validation for theory-guided superconductor discovery. This work establishes superconductivity in the perovskite hydride structural prototype -- expanding the limited family of experimentally realized ternary hydride superconductors -- and demonstrates the importance of quantum nuclear motion on the accurate theoretical treatment of low-pressure hydride superconductors. |
| title | Inverse Isotope Effect in the Ternary Perovskite Hydride SrPdH/D$_{2.9}$: A Signature of Quantum Zero-Point Fluctuations |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2602.23691 |