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| 001 | 601061 | ||
| 005 | 20250715173600.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.108.224115 |2 doi |
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| 100 | 1 | _ | |a Lacmann, Tom Laurin |0 P:(DE-H253)PIP1092469 |b 0 |e Corresponding author |
| 245 | _ | _ | |a High-pressure phase diagram of BaNi$_2$As$_2$: Unconventional charge density waves and structural phase transitions |
| 260 | _ | _ | |a Woodbury, NY |c 2023 |b Inst. |
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| 520 | _ | _ | |a Structural phase transitions accompanied by incommensurate and commensurate charge density wave (CDW) modulations of unconventional nature have been reported in BaNi$_2$As$_2$, a nonmagnetic cousin of the parent compound of Fe-based superconductors, BaFe$_2$As$_2$. The strong dependence of the structural and CDW transitions of BaNi$_2$As$_2$ on isoelectronic substitutions alongside original dynamical lattice effects suggests strong tunability of the electronic phase of the system through structural effects. Here, we present a comprehensive synchrotron x-ray diffraction and first-principles calculation study of the evolution of the crystal structure and lattice instabilities of BaNi$_2$As$_2$ as a function of temperature and hydrostatic pressure (up to 12 GPa). We report a cascade of pressure-induced structural phase transitions and electronic instabilities up to ≈10 GPa, above which all CDW superstructures disappear. We reveal that the stable high-pressure phase consists of planar Ni zigzag chains, from which the surrounding As atoms have been pushed away. This yields a strong reduction of the interlayer As-As distance (along the original c axis), akin to what is observed in the collapsed tetragonal structure of other pnictides, albeit here with a monoclinic structure. The discovery of polymorphs in the pressure-temperature phase diagram of BaNi$_2$As$_2$ emphasizes the importance of the relative Ni-Ni and Ni-As bond lengths in controlling the electronic ground state of this compound and increases our understanding of viable electronic phases under extreme conditions. |
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| 700 | 1 | _ | |a Haghighirad, Amir-Abbas |0 P:(DE-H253)PIP1087841 |b 1 |e Corresponding author |
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| 773 | _ | _ | |a 10.1103/PhysRevB.108.224115 |g Vol. 108, no. 22, p. 224115 |0 PERI:(DE-600)2844160-6 |n 22 |p 224115 |t Physical review / B |v 108 |y 2023 |x 2469-9950 |
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