Publication:
Inhomogeneous superconductivity in LuxZr1-x B12 dodecaborides with dynamic charge stripes

Дата
2021
Авторы
Azarevich, A.
Bogach, A.
Glushkov, V.
Demishev, S.
Kuznetsov, A.
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Организационные подразделения
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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© 2021 American Physical Society.We have studied the normal and superconductive state characteristics (resistivity, Hall coefficient, heat capacity, and magnetization) of model strongly correlated electronic systems LuxZr1-xB12 with cooperative Jahn-Teller instability of the boron rigid cage and with dynamic charge stripes. It was found that these metals are s-wave dirty limit superconductors with a small mean free path of charge carriers l=5-140Å and with a Cooper pair size changing nonmonotonously in the range 450-4000 Å. The parent ZrB12 and LuB12 borides are type-I superconductors, and Zr to Lu substitution induces a type-I to type-II phase transition providing a variation of the Ginzburg-Landau-Maki parameter in the limits 0.65≤κ1,2≤6. We argue in favor of the two-band scenario of superconductivity in LuxZr1-xB12 with gap values Δ1∼14K and Δ2∼6-8K, with pairing corresponding to strong coupling limit (λe-ph∼1) in the upper band, and to weak coupling (λe-ph∼0.1-0.4) in the lower one. A pseudogap Δps-gap∼60-110K is observed in LuxZr1-xB12 above Tc. We discuss also the possibility of anisotropic single-band superconductivity with stripe-induced both pair breaking and anisotropy, and analyze the origin of a unique enhanced surface superconductivity detected in these model compounds.
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Inhomogeneous superconductivity in LuxZr1-x B12 dodecaborides with dynamic charge stripes / Azarevich, A. [et al.] // Physical Review B. - 2021. - 103. - № 10. - 10.1103/PhysRevB.103.104515
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https://www.doi.org/10.1103/PhysRevB.103.104515
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85103839613&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000646630000003
 https://openrepository.mephi.ru/handle/123456789/23867
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