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DESCRIPTION:Superconductivity in nickelates was first stabilized in thin fi
 lms of hole doped\, infinite-layer (Nd\,Sr)NiO2\, exhibiting superconducti
 ng transition temperatures around 15–20 K under ambient conditions [1]. 
 This marked a significant step forward in the avenue of oxide-based superc
 onductors.\n\nSince then\, the field of nickelate superconductivity has ra
 pidly broadened to include a variety of rare-earth and dopant combinations
 \, and also extending to the undoped parent phase. Notably\, recent advanc
 es in materials synthesis techniques and reduction methods have pushed Tc 
 values even higher\, reaching up to 35 K in Sm(Eu\,Ca\,Sr)NiO2 thin films 
 [2].\n\nWhile these nickelates share notable similarities with cuprate sup
 erconductors - such as layered structures and a 3d9 electron configuration
 \, several key differences have also been observed\, particularly in their
  electronic structures and hybridization behaviour [3]. A fundamental ques
 tion is the symmetry of the superconducting gap structure in these materia
 ls. This remains difficult to probe using techniques commonly used to inve
 stigate the paring symmetry in superconductors\, such as London penetratio
 n depth measurements via mutual inductance [4] or tunnel diode oscillator 
 methods [5]\, single-particle tunnelling [6]\, photoemission spectroscopy 
 [7\,8]\, and thermal transport [9]\, largely due to challenges imposed by 
 thin film geometry and surface degradation caused during the chemical redu
 ction essential to stabilise the requisite Ni valency.\n\nTo investigate t
 his\, we employ high-energy electron irradiation to systematically introdu
 ce pairbreaking defects into infinite-layer nickelate thin films and track
  resulting changes in superconducting behavior. Our results show a clear s
 uppression of Tc and an increase in normal-state resistivity with increasi
 ng disorder which follows an Abrikosov-Gor’kov relation for non-magnetic
  defects in an unconventional\, nodal gap system. These observations provi
 de valuable insights into the superconducting order parameter and electron
 ic landscape of infinite-layer nickelates. More recently\, we also explore
  how these effects depend on choice of rare-earth ion\, including Nd-\, Pr
 -\, and La-based nickelates.\n\nReferences\n\n[1] Li\, et al. Nature 572\,
  624 (2019).\n\n[2] Chow\, et al. Nature (2025).\n\n[3] Wang\, Lee &amp; Goodg
 e. Annu. Rev. Condens. Matter Phys. 15:53\, 305 (2024).\n\n[4] Harvey\, et
  al. arXiv:2201.12971v1 (2022).\n\n[5] Chow\, et al. arXiv:2201.10038 (202
 2).\n\n[6] Gu\, et al. Nature Communications 11:6027 (2020).\n\n[7] Sun\, 
 et al. Science Advances 11\, eadr5116 (2025).\n\n[8] Ding\, et al. Nationa
 l Science Review 11\, nwae194 (2024).\n\n[9] Grissonnanche\, et al. Phys. 
 Rev. X 14\, 041021 (2024).\n\nSpeaker(s): Abhishek Ranna\, \n\n24 Quai Ern
 est Ansermet \, 	Geneva\, Switzerland\, Switzerland\, 1204
LOCATION:24 Quai Ernest Ansermet \, 	Geneva\, Switzerland\, Switzerland\, 1
 204
ORGANIZER:carmine.senatore@unige.ch
SEQUENCE:13
SUMMARY:Controlled introduction of disorder to probe the superconducting ga
 p symmetry of infinite-layer nickelates
URL;VALUE=URI:https://events.vtools.ieee.org/m/483287
X-ALT-DESC:Description: &lt;br /&gt;&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;EN-GB&quot; styl
 e=&quot;mso-ansi-language: EN-GB\;&quot;&gt;Superconductivity in nickelates was first s
 tabilized in thin films of hole doped\, infinite-layer&lt;/span&gt; &lt;span lang=&quot;
 EN-GB&quot; style=&quot;mso-ansi-language: EN-GB\;&quot;&gt;(Nd\,Sr)NiO2\, exhibiting superc
 onducting transition temperatures around 15&amp;ndash\;20 K under ambient&lt;/spa
 n&gt; &lt;span lang=&quot;EN-GB&quot; style=&quot;mso-ansi-language: EN-GB\;&quot;&gt;conditions [1]. T
 his marked a significant step forward in the avenue of oxide-based superco
 nductors.&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;EN-GB&quot; style=&quot;mso-
 ansi-language: EN-GB\;&quot;&gt;Since then\, the field of nickelate superconductiv
 ity has rapidly broadened to include a variety of rare-earth&lt;/span&gt; &lt;span 
 lang=&quot;EN-GB&quot; style=&quot;mso-ansi-language: EN-GB\;&quot;&gt;and dopant combinations\, 
 and also extending to the undoped parent phase. Notably\, recent advances 
 in materials synthesis techniques and reduction methods have pushed &lt;em&gt;T&lt;
 /em&gt;c values even higher\, reaching up to 35 K in Sm(Eu\,Ca\,Sr)NiO2 thin 
 films [2].&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;EN-GB&quot; style=&quot;mso
 -ansi-language: EN-GB\;&quot;&gt;&amp;nbsp\;While these nickelates share notable simil
 arities with cuprate superconductors - such as layered&lt;/span&gt; &lt;span lang=&quot;
 EN-GB&quot; style=&quot;mso-ansi-language: EN-GB\;&quot;&gt;structures and a 3&lt;em&gt;d&lt;/em&gt;9 el
 ectron configuration\, several key differences have also been observed\, p
 articularly&lt;/span&gt; &lt;span lang=&quot;EN-GB&quot; style=&quot;mso-ansi-language: EN-GB\;&quot;&gt;i
 n their electronic structures and hybridization behaviour [3]. A fundament
 al question is the symmetry&lt;/span&gt; &lt;span lang=&quot;EN-GB&quot; style=&quot;mso-ansi-lang
 uage: EN-GB\;&quot;&gt;of the superconducting gap structure in these materials. Th
 is remains difficult to probe using techniques commonly used to investigat
 e the paring symmetry in superconductors\, such as London penetration dept
 h measurements via mutual inductance [4] or tunnel diode oscillator method
 s [5]\, single-particle tunnelling [6]\, photoemission spectroscopy [7\,8]
 \, and thermal transport [9]\, largely due to challenges imposed by thin f
 ilm geometry and surface degradation caused during the chemical reduction 
 essential to stabilise the requisite Ni valency.&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;xms
 onormal&quot;&gt;&lt;span lang=&quot;EN-GB&quot; style=&quot;mso-ansi-language: EN-GB\;&quot;&gt;To investig
 ate this\, we employ high-energy electron irradiation to systematically in
 troduce pairbreaking&lt;/span&gt; &lt;span lang=&quot;EN-GB&quot; style=&quot;mso-ansi-language: E
 N-GB\;&quot;&gt;defects into infinite-layer nickelate thin films and track resulti
 ng changes in superconducting behavior. Our results show a clear suppressi
 on of &lt;em&gt;T&lt;/em&gt;c and an increase in normal-state resistivity with increas
 ing disorder which follows an Abrikosov-Gor&amp;rsquo\;kov relation for non-ma
 gnetic defects in an unconventional\, nodal gap system. These observations
  provide valuable insights into the superconducting order parameter and el
 ectronic landscape of infinite-layer nickelates. More recently\, we also e
 xplore how these effects depend on choice of rare-earth ion\, including Nd
 -\, Pr-\, and La-based&lt;/span&gt; nickelates.&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;stro
 ng&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-language: FR-CH\;&quot;&gt;References&lt;/span&gt;
 &lt;/strong&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-la
 nguage: FR-CH\;&quot;&gt;[1] Li\, et al. &lt;em&gt;Nature &lt;/em&gt;&lt;strong&gt;572&lt;/strong&gt;\, 62
 4 (2019).&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-
 ansi-language: FR-CH\;&quot;&gt;[2] Chow\, et al. &lt;em&gt;Nature &lt;/em&gt;(2025).&lt;/span&gt;&lt;/
 p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;EN-GB&quot; style=&quot;mso-ansi-language: EN-
 GB\;&quot;&gt;[3] Wang\, Lee &amp;amp\; Goodge. &lt;em&gt;Annu. Rev. Condens. &lt;/em&gt;&lt;/span&gt;&lt;e
 m&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-language: FR-CH\;&quot;&gt;Matter Phys. &lt;/spa
 n&gt;&lt;/em&gt;&lt;strong&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-language: FR-CH\;&quot;&gt;15:53
 &lt;/span&gt;&lt;/strong&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-language: FR-CH\;&quot;&gt;\, 3
 05 (2024).&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso
 -ansi-language: FR-CH\;&quot;&gt;[4] Harvey\, et al. arXiv:2201.12971v1 (2022).&lt;/s
 pan&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-languag
 e: FR-CH\;&quot;&gt;[5] Chow\, et al. arXiv:2201.10038 (2022).&lt;/span&gt;&lt;/p&gt;\n&lt;p clas
 s=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-language: FR-CH\;&quot;&gt;[6] G
 u\, et al. &lt;em&gt;Nature Communications &lt;/em&gt;&lt;strong&gt;11:6027 &lt;/strong&gt;(2020).
 &lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-lang
 uage: FR-CH\;&quot;&gt;[7] Sun\, et al. &lt;em&gt;Science Advances &lt;/em&gt;&lt;strong&gt;11&lt;/stro
 ng&gt;\, eadr5116 (2025).&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH
 &quot; style=&quot;mso-ansi-language: FR-CH\;&quot;&gt;[8] Ding\, et al. &lt;em&gt;National Scienc
 e Review &lt;/em&gt;&lt;strong&gt;11&lt;/strong&gt;\, nwae194 (2024).&lt;/span&gt;&lt;/p&gt;\n&lt;p class=&quot;
 xmsonormal&quot;&gt;&lt;span lang=&quot;FR-CH&quot; style=&quot;mso-ansi-language: FR-CH\;&quot;&gt;[9] Gris
 sonnanche\, et al. &lt;em&gt;Phys. Rev. X &lt;/em&gt;&lt;strong&gt;14&lt;/strong&gt;\, 041021 (202
 4).&lt;/span&gt;&lt;/p&gt;
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