55 citations · 282 across the 18 of their papers we have counts for
19 papers
Superconductivity at the metal-insulator phase boundary in a bulk nickelate at ambient pressure
Hyo-Bin Ahn, Xinglong Chen, Hong Zheng +9
The discovery of superconductivity in nickelates has seeded a new field for exploring unconventional superconductivity in transition metal oxides. However, to date superconductivit…
Synergistic doping and stabilization of magnetically tunable LnTi(Sb,Sn) (Ln:Ce--Gd) kagome metals
Brenden R. Ortiz, Ramakanta Chapai, German Samolyuk +9
Here we present our synthesis and characterization of the LnTi(Sb,Sn) (Ln: Ce, Pr, Nd, Sm, Gd) family of cleavable kagome metals. While these materials are isostructural to…
Origin of the Unusual Temperature Dependence of the Upper Critical Field of Kagome Superconductor CsV3Sb5: Multiple Bands or van Hove Singularities?
Ramakanta Chapai, Alexei E. Koshelev, Matthew P. Smylie +8
Van Hove singularities (vHs) located close to the Fermi level in Kagome superconductors AV3Sb5 (A = K, Rb, Cs) have profound influence on their electronic and transport characteris…
Non-bulk Superconductivity in PrNiO Single Crystals Under Pressure
Xinglong Chen, E. H. T. Poldi, Shuyuan Huyan +8
Magneto-transport measurements of PrNiO single crystals performed under externally applied pressures up to 73 GPa in diamond anvil cells with either KBr or Nujol oil…
Fermi Surface Topology and Magneto-transport Properties of Superconducting PdBiSe
Ramakanta Chapai, Gordon Peterson, M. P. Smylie +5
PdBiSe is a rare realization of a superconducting metal with a non-zero topological invariant. We report the growth of high-quality single crystals of layered Pd$…
Origin of anomalous magnetotransport in kagome superconductors AVSb (A=K,Rb,Cs)
A. E. Koshelev, R. Chapai, D. Y. Chung +2
Multiple anomalous features in electronic spectra of metals with kagome lattice structure -- van Hove singularities, Dirac points, and flat bands -- imply that materials containing…
A15 Phase Ta3Sb Thin Films: Direct Synthesis, Charge Transport and Spin-Orbit Torque
J. S. Jiang, Qianheng Du, Yi Li +9
Ta3Sb is one of the A15 compounds that have been predicted to have giant spin Hall conductivities due to the gapped Dirac-like band crossings in their electronic structures. We use…
Evidence for Unconventional Superconductivity and Nontrivial Topology in PdTe
Ramakanta Chapai, P. V. Sreenivasa Reddy, Lingyi Xing +4
PdTe is a superconductor with Tc ~4.25 K. Recently, evidence for bulk-nodal and surface-nodeless gap features has been reported in PdTe [Yang et al., Phys. Rev. Lett. 130, 046402 (…
Multi-k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
C. Dhital, R. L. Dally, R. Ruvalcaba +15
The magnetic structure, magnetoresistance, and Hall effect of non-centrosymmetric magnetic semimetal NdAlGe are investigated revealing an unusual magnetic state and anomalous trans…
Coexistence of bulk-nodal and surface-nodeless Cooper pairings in a superconducting Dirac semimetal
Xian P. Yang, Yigui Zhong, Sougata Mardanya +21
The interplay of nontrivial topology and superconductivity in condensed matter physics gives rise to exotic phenomena. However, materials are extremely rare where it is possible to…
Superconducting properties and gap structure of the topological superconductor candidate Ti_(3)Sb
R. Chapai, M. P. Smylie, H. Hebbeker +4
We present a study of the superconducting properties of the candidate topological superconductor Ti_(3)Sb. Electrical transport measurements show zero resistance with a T_(c,onset)…
Magnetic Breakdown and Topology in the Kagome Superconductor CsV3Sb5 under High Magnetic Field
Ramakanta Chapai, Maxime Leroux, Vincent Oliviero +7
The recently discovered layered Kagome metals of composition AV3Sb5 (A = K, Rb, Cs) exhibit a complex interplay among superconductivity, charge density wave order, topologically no…
Superconducting properties of the spin Hall candidate Ta3Sb with eightfold degeneracy
R. Chapai, A. Rydh, M. P. Smylie +7
We report the synthesis and characterization of phase pure Ta3Sb, a material predicted to be topological with eightfold degenerate fermionic states [Science 353, aaf5037 (2016)] an…
Full superconducting gap in the candidate topological superconductor InPbTe for x = 0.2
M. P. Smylie, Kaya Kobayashi, J. Z. Dans +4
High-pressure synthesis techniques have allowed for the growth of samples on the indium-rich side of (Pb,In)Te, which have increased superconducting transition temperatures compare…
Helical magnetic order and Fermi surface nesting in non-centrosymmetric ScFeGe
Sunil K. Karna, D. Tristant, J. K. Hebert +25
An investigation of the structural, magnetic, thermodynamic, and charge transport properties of non-centrosymmetric hexagonal ScFeGe reveals it to be an anisotropic metal with a tr…
Observation of sixfold degenerate fermions in PdSb
Xiàn Yáng, Tyler A. Cochran, Ramakanta Chapai +16
Three types of fermions have been extensively studied in topological quantum materials: Dirac, Weyl, and Majorana fermions. Beyond the fundamental fermions in high energy physics,…
Observation of a mesoscopic magnetic modulation in chiral Mn1/3NbS2
Sunil K. Karna, F. N. Womack, R. Chapai +10
We have investigated the structural, magnetic, thermodynamic, and charge transport properties of Mn1/3NbS2 single crystals through x-ray and neutron diffraction, magnetization, spe…
Fermions and bosons in nonsymmorphic PdSb2 with sixfold degeneracy
Ramakanta Chapai, Yating Jia, W. A. Shelton +6
PdSb2 is a candidate for hosting 6-fold-degenerate exotic fermions (beyond Dirac and Weyl fermions).The nontrivial band crossing protected by the nonsymmorphic symmetry plays a cru…
Structure-Property Relationship in Layered BaMn2Sb2 and Ba2Mn3Sb2O2
Qiang Zhang, Zhenyu Diao, Huibo Cao +5
Layered transition-metal compounds have received great attention owing to their novel physical properties. Here, we present the structural, electronic, thermal, and magnetic proper…