Magnetic-superconducting phase boundary of SmFeAsO1-xFx studied via muon spin rotation: Unified behavior in a pnictide family

被引：63

作者：

Sanna, S. ^{[1
,2
,3
]}

De Renzi, R. ^{[1
]}

Lamura, G. ^{[4
,5
,6
]}

Ferdeghini, C. ^{[4
,5
]}

Palenzona, A. ^{[4
,5
]}

Putti, M. ^{[4
,5
]}

Tropeano, M. ^{[4
,5
]}

Shiroka, T. ^{[7
]}

机构：

[1] Univ Parma, Dipartimento Fis, Unita CNISM Parma, I-43100 Parma, Italy

[2] Dipartimento Fis A Volta, I-27100 Pavia, Italy

[3] Unita CNISM Pavia, I-27100 Pavia, Italy

[4] CNR, INFM, LAMIA, I-16146 Genoa, Italy

[5] Univ Genoa, I-16146 Genoa, Italy

[6] Univ Naples Federico II, CNR, INFM Coherentia, I-80125 Naples, Italy

[7] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 05期

关键词：

high-temperature superconductors; iron compounds; magnetic transition temperature; muon probes; samarium compounds; superconducting transition temperature; GROUND-STATE; DIAGRAM; TEMPERATURE; COEXISTENCE;

D O I：

10.1103/PhysRevB.80.052503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present Muon spectroscopy investigations on SmFeAsO1-xFx showing coexistence of magnetic order and superconductivity only in a very narrow F-doping range. The sharp crossover between the two types of order is similar to that observed in LaFeAsO1-xFx, suggesting a common behavior for the 1111 pnictides. The analysis of the muon asymmetry demonstrates that the coexistence must be nanoscopic, i.e., the two phases must be finely interspersed over a typical length scale of few nm. In this regime both the magnetic and the superconducting transition temperatures collapse to very low values. Our data suggest a competition between the two order parameters.

引用

页数：4

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