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Effect of pressure on the magnetostructural transition in SrFe 2 As 2

2008; American Physical Society; Volume: 78; Issue: 18 Linguagem: Inglês

10.1103/physrevb.78.184516

1550-235X

Manoj Kumar, M. Nicklas, Anton Jesche, N. Caroca‐Canales, M. Schmitt, M. Hanfland, Deepa Kasinathan, Ulrich Schwarz, H. Rösner, C. Geibel,

Intellectual Capital and Performance Analysis

We present a systematic pressure study of poly- and single-crystalline ${\text{SrFe}}_{2}{\text{As}}_{2}$ by electrical-resistivity and x-ray-diffraction measurements. ${\text{SrFe}}_{2}{\text{As}}_{2}$ exhibits a structural phase transition from a tetragonal to an orthorhombic phase at ${T}_{0}=205\text{ }\text{K}$. The structural phase transition is intimately linked to a spin-density-wave transition taking place at the same temperature. Our pressure experiments show that ${T}_{0}$ shifts to lower temperatures with increasing pressure. We can estimate a critical pressure of 4--5 GPa for the suppression of ${T}_{0}$ to zero temperature. At pressures above 2.5 GPa the resistivity decreases significantly below ${T}_{x}\ensuremath{\approx}40\text{ }\text{K}$, hinting at the emergence of superconductivity, but no zero-resistance state is observed up to 3 GPa.