Phys. Rev. B 80, 134523 (2009) [4 pages]Anisotropic thermal expansion of Fe1.06Te and FeTe0.5Se0.5 single crystalsReceived 21 July 2009; revised 7 October 2009; published 28 October 2009 Heat capacity and anisotropic thermal expansion was measured for Fe1.06Te and FeTe0.5Se0.5 single crystals. Previously reported phase transitions are clearly seen in both measurements. In both cases the thermal expansion is anisotropic. The uniaxial pressure derivatives of the superconducting transition temperature in FeTe0.5Se0.5 inferred from the Ehrenfest relation have opposite signs for in-plane and c-axis pressures. The Grüneisen parameters for both materials are similar and only weakly temperature dependent above ∼80 K. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.134523
DOI:
10.1103/PhysRevB.80.134523
PACS:
65.40.Ba, 65.40.De, 74.25.Bt, 74.62.Fj
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