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Ni<sub>2</sub>X<sub>2</sub> (X=pnictide, chalcogenide, or B) based superconductors
Ronning, F.,Bauer, E.D.,Park, T.,Kurita, N.,Klimczuk, T.,Movshovich, R.,Sefat, A.S.,Mandrus, D.,Thompson, J.D. Elsevier 2009 Physica. C, Superconductivity Vol.469 No.9
<P>We review the properties of Ni-based superconductors which contain Ni2X2 (X = As, P, Bi, Si, Ge, B) planes, a common structural element found also in the recently discovered FeAs superconductors. Strong evidence for the fully gapped nature of the superconducting state has come from field dependent thermal conductivity results on BaNi2As2. Coupled with the lack of magnetism. the majority of evidence suggests that the Ni-based compounds are conventional elect ron-phonon mediated superconductors. However, the increase in T-c in LaNiAsO with doping is anomalous, and mimics the behavior in LaFeAsO. Furthermore, comparisons of the properties of Ni- and Fe-based systems show many similarities, particularly with regards to structure-property relationships. This suggests a deeper connection between the physics of the FeAs superconductors and the related Ni-based systems which deserves further investigation. (C) 2009 Elsevier B.V. All rights reserved.</P>
Field-induced quantum critical point in the pressure-induced superconductor CeRhIn<sub>5</sub>
Park, T.,Tokiwa, Y.,Ronning, F.,Lee, H.,Bauer, E. D.,Movshovich, R.,Thompson, J. D. WILEY-VCH Verlag 2010 Physica Status Solidi. B Vol.247 No.3
<P>When subjected to pressure, the prototypical heavy-fermion antiferromagnet CeRhIn<SUB>5</SUB> becomes superconducting, forming a broad dome of superconductivity (SC) centred around 2.35 GPa (=P2) with maximal T<SUB>c</SUB> of 2.3 K. Above the superconducting dome, the normal state shows strange metallic behaviours, including a divergence in the specific heat and a sub-T-linear electrical resistivity. The discovery of a field-induced magnetic phase that coexists with SC for a range of pressures P ≤ P2 has been interpreted as evidence for a quantum phase transition, which could explain the non-Fermi-liquid behaviour observed in the normal state. Here we report electrical resistivity measurements of CeRhIn<SUB>5</SUB> under magnetic field at P2, where the resistivity is sub-T-linear for temperatures above T<SUB>c</SUB> (or T<SUB>FL</SUB>) and a T<SUP>2</SUP>-coefficient A found below T<SUB>FL</SUB> diverges as H<SUB>c2</SUB> is approached. These results are similar to the field-induced quantum critical compound CeCoIn<SUB>5</SUB> and confirm the presence of a quantum critical point in the pressure-induced superconductor CeRhIn<SUB>5</SUB>. Temperature-field phase diagram of CeRhIn<SUB>5</SUB> at 2.35 GPa.</P><P> <img src='wiley_img_2010/03701972-2010-247-3-PSSB200983076-gra001.gif' alt='wiley_img_2010/03701972-2010-247-3-PSSB200983076-gra001'> </P>
Transport and thermodynamic properties ofSr3Ru2O7near the quantum critical point
Zhou, Z. X.,McCall, S.,Alexander, C. S.,Crow, J. E.,Schlottmann, P.,Bianchi, A.,Capan, C.,Movshovich, R.,Kim, K. H.,Jaime, M.,Harrison, N.,Haas, M. K.,Cava, R. J.,Cao, G. American Physical Society 2004 Physical review. B, Condensed matter and materials Vol.69 No.14
Kim, Jeehoon,Haberkorn, N.,Nazaretski, E.,Paula, R. de,Tan, Teng,Xi, X.X.,Tajima, T.,Movshovich, R.,Civale, L. Elsevier 2015 Solid state communications Vol.204 No.-
<P><B>Abstract</B></P> <P>We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB<SUB>2</SUB> thin film. The small magnetic penetration depth of <I>λ</I>=50±10nm at <I>T</I>=4K is related to a clean π-band. We find a high self-field critical current density <I>J</I> <SUB> <I>c</I> </SUB>, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate <I>S</I> (<I>T</I>) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.</P>
Imaging magnetic domains in vector magnetic fields via magnetic force microscopy
Dirk WULFERDING,Ilkyu YANG,Hoon KIM,Oscar AYALA-VALENZUELA,Minkyung LEE,Hee Cheul CHOI,Filip RONNING,Leonardo CIVALE,Ryan BAUMBACH,Eric BAUER,Joe THOMPSON,Roman MOVSHOVICH,Jeehoon KIM 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8