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Park, Eunsung,Lee, Sangyun,Ronning, Filip,Thompson, Joe D,Zhang, Qiu,Balicas, Luis,Lu, Xin,Park, Tuson IOP 2018 Journal of Physics, Condensed Matter Vol.30 No.16
<P>Low-dimensional electronic systems with confined electronic wave functions have attracted interest due to their propensity toward novel quantum phases and their use in wide range of nanotechnologies. The newly discovered chalcogenide Nb<SUB>2</SUB>PdS<SUB>5</SUB> possesses a quasi-one-dimensional electronic structure and becomes superconducting. Here, we report spectroscopic evidence for two-band superconductivity, where soft point-contact spectroscopic measurements in the superconducting (SC) state reveal Andreev reflection in the differential conductance <I>G</I>. Multiple peaks in <I>G</I> are observed at 1.8 K and explained by the two-band Blonder–Tinkham–Klapwijk model with two gaps Δ<SUB>1</SUB> = 0.61 meV and Δ<SUB>2</SUB> = 1.20 meV. The progressive evolution of <I>G</I> with temperature and magnetic field corroborates the multiple nature of the SC gaps.</P>
Synthesis and characterization of the heavy-fermion compound CePtAl<sub>4</sub>Ge<sub>2</sub>
Shin, Soohyeon,Rosa, Priscila F.S.,Ronning, Filip,Thompson, Joe D.,Scott, Brian L.,Lee, Sangyun,Jang, Harim,Jung, Soon-Gil,Yun, Eunbhin,Lee, Hyoyoung,Bauer, Eric D.,Park, Tuson Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.738 No.-
<P><B>Abstract</B></P> <P>We report the synthesis of the Ce-based quaternary compound CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> that crystallizes in the trigonal structure (space group <I>R</I> 3 ¯ <I>m</I>, 166) with unit cell parameters, <I>a</I> = 4.1995(5) Å, <I>c</I> = 31.851(7) Å, and γ = 120°. Powder X-ray diffraction and energy dispersive X-ray spectroscopy show that CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> (LaPtAl<SUB>4</SUB>Ge<SUB>2</SUB>) is in a single, homogeneous phase. Magnetic susceptibility, electrical resistivity, and heat capacity measurements of CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> show that it exhibits antiferromagnetic behavior below 2.3 K. The magnetic susceptibility for the magnetic field applied perpendicular (χ<SUB>ab</SUB>) and parallel (χ<SUB>c</SUB>) to the crystalline c-axis is very anisotropic, and the susceptibility ratio (χ<SUB>ab</SUB>/χ<SUB>c</SUB>) reaches a maximum value of 10, indicating that the spin easy axis is within the Ce plane. The entropy recovered at <I>T</I> <SUB>N</SUB> is consistent with the doublet ground state of the crystal field split <I>J</I> = 5/2 multiplet of Ce<SUP>3+</SUP> ions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> synthesized by the Al/Ge flux method adopts the trigonal structure. </LI> <LI> CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> is an antiferromagnet with <I>T</I> <SUB>N</SUB> of 2.3 K. </LI> <LI> CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> is a heavy fermion compound with the effective mass of 205 mJ mol<SUP>−1</SUP> K<SUP>−2</SUP>. </LI> <LI> The entropy at <I>T</I> <SUB>N</SUB> is consistent with the doublet ground state of J = 5/2 of Ce<SUP>3+</SUP> ions. </LI> </UL> </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