Enhanced Superconductivity by Rare-earth Metal-doping in Phenanthrene

X. F. Wang; X. G. Luo; J. J. Ying; Z. J. Xiang; S. L. Zhang; R. R. Zhang; Y. H. Zhang; Y. J. Yan; A. F. Wang; P. Cheng; G. J. Ye; X. H. Chen

doi:10.1088/0953-8984/24/34/345701

paper

Enhanced Superconductivity by Rare-earth Metal-doping in Phenanthrene

arXiv:1203.5887 · doi:10.1088/0953-8984/24/34/345701

Abstract

We successfully synthesized La- and Sm-doped phenanthrene powder samples and discovered superconductivity at $T_{c}$ around 6 K in them. The $T_{c}$ s are 6.1 K for LaPhenanthrene and 6.0 K for SmPhenanthrene, which are enhanced by about 1 K and 0.5 K compared to those in $A_{3}$ Phenanthrene ( $A$ =K and Rb) and in $A e_{1.5}$ Phenanthrene ( $A e$ = Sr and Ba) superconductors respectively. The superconductive shielding fractions for LaPhenanthrene and SmPhenanthrene are 46.1% $an d 49.8$ % $a t 2 K, r es p ec t i v e l y . T h e l i ttl ee f f ec t o f t h e d o p in g o f t h e ma g n e t i c i o n S m$ ^{3+} $o n$ T_c $an d t h e p os i t i v e p r ess u r e d e p e n d e n cecoe f f i c i e n t o n$ T_{\rm c} $s t r o n g l y s ug g es t s u n co n v e n t i o na l s u p er co n d u c t i v i t y in t h e d o p e d p h e nan t h r e n es u p er co n d u c t or s . T h ec ha r g e t r an s f er t oor g ani c m o l ec u l es f r o m d o p an t so f L aan d S min d u ces a r e d s hi f t o f 7 c m$ ^{-1} $p er e l ec t r o n f or t h e m o d e a t 1441 c m$ ^{-1} $in t h e R aman s p ec t r a, w hi c hi s a l m os tt h es am e a s t h oseo b ser v e d in$ A_3 $P h e nan t h r e n e ($ A $= K an d R b) an d$ Ae_{1.5} $P h e nan t h r e n e ($ Ae$ = Sr and Ba) superconductors.

5 pages, 5 figures

Enhanced Superconductivity by Rare-earth Metal-doping in Phenanthrene

Abstract

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