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| Home > Publications database > $I$-centered versus F -centered orthorhombic symmetry and negative thermal expansion of the charge density wave of EuAl$_2$Ga$_2$ > print |
| 001 | 628863 | ||
| 005 | 20250715151525.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.111.155144 |2 doi |
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| 100 | 1 | _ | |a AGARWAL, HARSHIT |0 P:(DE-H253)PIP1085866 |b 0 |e Corresponding author |
| 245 | _ | _ | |a $I$-centered versus F -centered orthorhombic symmetry and negative thermal expansion of the charge density wave of EuAl$_2$Ga$_2$ |
| 260 | _ | _ | |a Woodbury, NY |c 2025 |b Inst. |
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| 520 | _ | _ | |a Together with EuGa$_4$ and EuAl$_4$, EuAl$_2$Ga$_2$ belongs to the BaAl$_4$ structure type with space group 𝐼4/mmm. EuAl2Ga2 develops an incommensurate charge density wave (CDW) at temperatures below $𝑇_{CDW}$=51K. On the basis of temperature-dependent single-crystal x-ray diffraction data, the incommensurately modulated CDW crystal structure of EuAl2Ga2 is determined to possess orthorhombic symmetry Immm(00γ)𝑠00. This symmetry is different from the orthorhombic Fmmm-based symmetry of the CDW state of EuAl$_4$. Nevertheless, both symmetries, Immm(00γ)𝑠00 and Fmmm(00γ)𝑠00, lead to the same conclusion, that the CDW is supported by the layers of Al1 type atoms, while the Eu and Al$_2$ or Ga atoms are not directly involved in CDW formation. The different symmetries of the CDW states of EuAl4 and EuAl2Ga2, as well as the observation of negative thermal expansion in the CDW state of EuAl$_2$Ga$_2$, might be explained by the effects of Ga substitution in the latter compound. |
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| 773 | _ | _ | |a 10.1103/PhysRevB.111.155144 |g Vol. 111, no. 15, p. 155144 |0 PERI:(DE-600)2844160-6 |n 15 |p 155144 |t Physical review / B |v 111 |y 2025 |x 2469-9950 |
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