&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;4Fe&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;As&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;Te&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;O&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;F&lt;i&gt;&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;&lt;/i&gt; (&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; = Pr, Sm, Gd): A layered oxypnictide superconductor with &lt;i&gt;T&lt;span class="aps-inline-formula"&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;&lt;/i&gt; up to 45 K

S Katrych,A Pisoni,L Forró,R Gaal,S Bosma,N D Zhigadlo,S Weyeneth,J Karpinski

doi:10.1103/physrevb.89.024518

<math><mi>L</mi></math>4Fe<math><msub><mrow></mrow><mn>2</mn></msub></math>As<math><msub><mrow></mrow><mn>2</mn></msub></math>Te<math><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></math>O<math><msub><mrow></mrow><mrow><mn>4</mn><mo>−</mo><mi>y</mi></mrow></msub></math>F<math><msub><mrow></mrow><mi>y</mi></msub></math> (<math><mi>L</mi></math> = Pr, Sm, Gd): A layered oxypnictide superconductor with T<math><msub><mrow></mrow><mi>c</mi></msub></math> up to 45 K

S Katrych, A Pisoni + Show 6 more

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https://doi.org/10.1103/physrevb.89.024518

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Journal: Physical review. B	Publication Date: Jan 31, 2014
Citations: 9

Affiliation: École Polytechnique Fédérale de Lausanne, University of Zurich, ETH Zurich

#Substitution Of Oxygen #Anvil Technique + Show 8 more

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Abstract

The synthesis, structural and physical properties of iron lanthanide oxypnictide superconductors, L4Fe2As2Te1-xO4 (L = Pr, Sm, Gd), with transition temperature at ~ 25 K are reported. Single crystals have been grown at high pressure using cubic anvil technique. The crystal structure consists of layers of L2O2 tetrahedra separated by alternating layers of chains of Te and of Fe2As2 tetrahedra: -L2O2-Te-L2O2-Fe2As2-L2O2-Te-L2O2- (space group: I4/mmm, a ~ 4.0, c ~ 29.6 {\AA}). Substitution of oxygen by fluorine increases the critical temperature, e.g. in Gd4Fe2As2Te1-xOyF4-y up to 45 K. Magnetic torque measurements reveal an anisotropy of the penetration depths of ~31.

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