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Low-temperature phase diagram of Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math>Te studied using x-ray diffraction
We used low-temperature synchrotron x-ray diffraction to investigate the structural phase transitions of Fe${}_{1+y}$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 Fe${}_{1+y}$Te showed that two-step structural and magnetic phase transitions …