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Low-temperature phase diagram of Fe1+yTe studied using x-ray diffraction

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Koz,  C.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Rößler,  S.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tsirlin,  A. A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wirth,  S.
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schwarz,  U.
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Koz, C., Rößler, S., Tsirlin, A. A., Wirth, S., & Schwarz, U. (2013). Low-temperature phase diagram of Fe1+yTe studied using x-ray diffraction. Physical Review B, 88(9): 094509, pp. 094509-1-094509-10. doi:10.1103/PhysRevB.88.094509.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1E54-2
Abstract
We used low-temperature synchrotron x-ray diffraction to investigate the structural phase transitions of Fe1+y Te in the vicinity of a tricitical point in the phase diagram. A detailed analysis of the powder diffraction patterns and temperature dependence of the peak widths in Fe1+y Te showed that two-step structural and magnetic phase transitions occur within the compositional range 0.11 <= y <= 0.13. The phase transitions are sluggish, indicating a strong competition between the orthorhombic and the monoclinic phases. We combine high-resolution diffraction experiments with specific heat, resistivity, and magnetization measurements and present a revised temperature-composition phase diagram for Fe1+y Te.