Russian Academy of Sciences

Landau Institute for Theoretical Physics

Seminars at the Landau Institute scientific council

Anizotropiya elektronnykh transportnykh i sverkhprovodyashchikh svoistv v FeSe

28 April in 11:30

P.G. Grigor’ev

Naideno i kolichestvenno opisano obshchee svoistvo: esli neodnorodnaya sverkhprovodimost’ v anizotropnom provodnike poyavlyaetsya v vide izolirovannykh sverkhprovodyashchikh ostrovkov, ona umen’shaet elektricheskoe soprotivlenie anizotropno s maksimal’nym effektom vdol’ osi s naimen’shei provodimost’yu. Eto svoistvo daet prostoi i ochen’ obshchii instrument dlya izucheniya neodnorodnoi (ostrovkovoi) sverkhprovodimosti v razlichnykh anizotropnykh soedineniyakh i pozvolyaet otsenit’ velichinu i temperaturnuyu zavisimost’ ob’emnoi doli sverkhprovodyashchei fazy. Yavlenie nablyudaetsya v razlichnykh vysokotemperaturnykh sverkhprovodnikakh i v organicheskikh metallakh. C pomoshch’yu opisannogo svoistva i izmerenii elektronnoi provodimosti i diamagnetizma vpervye pokazano poyavlenie neodnorodnoi sverkhprovodimosti v ob’emnom soedineniya FeSe pri atmosfernom davlenii i pri temperature v 5 raz vyshe, chem izvestnaya ranee temperatura sverkhprovodyashchego perekhoda Tc=8K, sootvetstvuyushchaya nulevomu soprotivleniyu. Eto otkrytie pomogaet ponyat’ mnogochislennye neobychnye sverkhprovodyashchie svoistva FeSe, takie kak pyatikratnoe povyshenie Tc pri uvelichenii davleniya do neskol’kikh kilobar. Obsuzhdaetsya vozmozhnost’ primeneniya etogo svoistva dlya obnaruzheniya prostranstvenno neodnorodnoi sverkhprovodimosti v drugikh anizotropnykh soedineniyakh, takikh kak kupraty i organicheskie metally.

Seminars are held on Fridays in the conference hall of Landau Institute for Theoretical Physics in Chernogolovka, beginning at 11:30.

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