Superconductivity and magnetism in noncentrosymmetric LaPtGe3 and CePtGe3

Manuel Feig; Michael Nicklas; Matej Bobnar; Walter Schnelle; Ulrich Schwarz; Andreas Leithe-Jasper; Christoph Hennig; Roman Gumeniuk

doi:10.1103/PhysRevB.98.184516

Superconductivity and magnetism in noncentrosymmetric LaPtGe3 and CePtGe3

Manuel Feig, Michael Nicklas, Matej Bobnar, Walter Schnelle, Ulrich Schwarz, Andreas Leithe-Jasper, Christoph Hennig, Roman Gumeniuk

DOI 10.1103/PhysRevB.98.184516 · Physical Review B

T1

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Abstract

LaPtGe3 and CePtGe3 crystallize with a noncentrosymmetric body-centered tetragonal (space group I4mm)BaNiSn3-type of structure. LaPtGe3 is a weakly coupled BCS-like s-wave type-I superconductor with Tc=0.55 K, Bc≃14 mT, and Ginzburg-Landau parameter κGL=0.021<1/2. CePtGe3 is a nonsuperconducting (Tnsc=0.35 K) metal with an effective magnetic moment μeff=2.46μB. The Ce moments show two antiferromagnetic ordering transitions at TN1≈3.7 K and TN2≈2.7 K and a ground-state multiplet J=5/2 splitting into three doublets (energy splittings from the ground state Δ1=46 K and Δ2=137 K). The moderately enhanced Sommerfeld coefficient γ0 and the observation of almost the full critical magnetic entropy at TN1 suggest that magnetic Ruderman-Kittel-Kasuya-Yosida-type interactions are dominant in CePtGe3, leading to a magnetically ordered ground state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaPtGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.55	Pressure not reported	midpoint
LaPtGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.57	Pressure not reported	zero_resistance
CePtGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Mo3Al2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LaRhSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.16	Pressure not reported	unknown
LaIrSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.72	Pressure not reported	unknown
LaPdSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.65	Pressure not reported	unknown