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22 papers
NMR/NQR and AC-susceptibility Studies in the Weyl Semimetal Superconductor 1T-MoTe under Pressure
Takuto. Fujii, Hiroshi Yasuoka, Mukkattu Omanakuttan Ajeesh +5
We performed the Te-nuclear magnetic resonance, the Mo-nuclear quadrupole resonance, and the AC susceptibility in the Weyl semimetal superconductor 1T-MoTe at pressures up to 2…
Discovery of nodal-line superconductivity in chiral crystals
Tian Shang, Jianzhou Zhao, Lun-Hui Hu +9
Chiral crystals, whose key feature is the structural handedness, host exotic quantum phenomena driven by the interplay of band topology, spin-orbit coupling (SOC), and electronic c…
Hydrostatic pressure studies on non-superconducting UTe2
M. O. Ajeesh, Joe D. Thompson, Eric D. Bauer +3
We report the temperature-pressure phase diagram of a UTe single crystal that does not undergo a bulk superconducting transition but shows filamentary superconductivity with a…
Pressure evolution of coplanar antiferromagnetism in heavy-fermion CeCoAlGe
M. O. Ajeesh, A. O. Scheie, Yu Liu +4
CeAlGe ( Co, Ir, Ni or Pd) are heavy-fermion materials and host a variety of ground states ranging from magnetism to non-Fermi liquid behavior. The Co, Ir,…
Spectrum and low-temperature bulk properties of triangular quantum spin liquid candidate NaYbSe
A. O. Scheie, Minseong Lee, Kevin Wang +18
We report neutron scattering, pressure-dependent AC calorimetry, and AC magnetic susceptibility measurements of triangular lattice NaYbSe. We observe a continuum of scattering,…
Structural and physical properties of the chiral antiferromagnet CeRhC
Yu Liu, M. O. Ajeesh, A. O. Scheie +6
We report a study of the structural, magnetic, transport, and thermodynamic properties of polycrystalline samples of CeRhC. CeRhC crystallizes in a tetragonal structure wit…
Localized f-electron magnetism in the semimetal Ce3Bi4Au3
M. O. Ajeesh, S. K. Kushwaha, S. M. Thomas +5
CeBiAu crystallizes in the same non-centrosymmetric cubic structure as the prototypical Kondo insulator CeBiPt. Here we report the physical prop…
The fate of time-reversal symmetry breaking in UTe2
M. O. Ajeesh, M. Bordelon, C. Girod +7
Topological superconductivity is a long-sought state of matter in bulk materials, and odd-parity superconductor UTe is a prime candidate. The recent observation of a field-trai…
Interplay of structure and magnetism in LuFe4Ge2 tuned by hydrostatic pressure
M. O. Ajeesh, P. Materne, R. D. dos Reis +15
LuFeGe crystallizes in the ZrFeSi-type structure, hosting chains of Fe-tetrahedra giving rise to geometric frustration and low-dimensionality. The compound orders a…
Non-linear magnons and exchange Hamiltonians of delafossite proximate quantum spin liquids
A. O. Scheie, Y. Kamiya, Hao Zhang +20
Quantum spin liquids (QSL) are theoretical states of matter with long-range entanglement and exotic quasiparticles. However, they generally elude quantitative theory, rendering the…
Spin-triplet superconductivity in Weyl nodal-line semimetals
Tian Shang, Sudeep K. Ghosh, Michael Smidman +14
Topological semimetals are three dimensional materials with symmetry-protected massless bulk excitations. As a special case, Weyl nodal-line semimetals are realized in materials ei…
Ground state of CeBiPd unraveled by hydrostatic pressure
M. O. Ajeesh, S. M. Thomas, S. K. Kushwaha +5
Noncentrosymmetric CeBiPd has attracted a lot of attention as a candidate for strongly correlated topological material, yet its experimental ground state remains…
The planar triangular magnet AgCrSe: magnetic frustration, short range correlations, and field tuned anisotropic cycloidal magnetic order
M. Baenitz, M. M. Piva, S. Luther +25
Our studies evidence an anisotropic magnetic order below ~K. Susceptibility data in small fields of about 1~T reveal an antiferromagnetic (AFM) order for , whe…
Possible Pressure-Induced Charge-Density Wave Quantum Critical Point in LuPd2In
M. O. Ajeesh, Thomas Gruner, Christoph Geibel +1
We investigated the effect of application of hydrostatic pressure on the charge-density wave (CDW) state in Lu(PtPd)In by electrical-resistivity measurements. In Lu…
Putative quantum critical point in the itinerant magnet ZrFeSi with a frustrated quasi-one-dimensional structure
M. O. Ajeesh, K. Weber, C. Geibel +1
The Fe sublattice in the compound ZrFeSi features geometrical frustration and quasi-one-dimensionality. We therefore investigated the magnetic behavior in ZrFeSi an…
Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet Mn3Ge
R. D. dos Reis, M. Ghorbani Zavareh, M. O. Ajeesh +9
We report on the pressure evolution of the giant anomalous Hall effect (AHE) in the chiral antiferromagnet MnGe. The AHE originating from the non-vanishing Berry curvature in M…
Pressure-tuning of the electrical-transport properties in the Weyl semimetal TaP
M. Besser, R. D. dos Reis, F. -R. Fan +5
We investigated the pressure evolution of the electrical transport in the almost compensated Weyl semimetal TaP. In addition, we obtained information on the modifications of the Fe…
Thermopower and thermal conductivity in the Weyl semimetal NbP
U. Stockert, R. D. dos Reis, M. O. Ajeesh +7
The Weyl semimetal NbP exhibits an extremely large magnetoresistance (MR) and an ultra-high mobility. The large MR originates from a combination of the nearly perfect compensation…
Ising-type Magnetic Anisotropy in CePdAs
M. O. Ajeesh, T. Shang, W. B. Jiang +6
We investigated the anisotropic magnetic properties of CePdAs by magnetic, thermal and electrical transport studies. X-ray diffraction confirmed the tetragonal ThCrSi$_…
On the search for the chiral anomaly in Weyl semimetals: The negative longitudinal magnetoresistance
R. D. dos Reis, M. O. Ajeesh, N. Kumar +6
Recently, the existence of massless chiral (Weyl) fermions has been postulated in a class of semi-metals with a non-trivial energy dispersion.These materials are now commonly dubbe…
Pressure tuning the Fermi-surface topology of the Weyl semimetal NbP
R. D. dos Reis, S. C. Wu, Y. Sun +6
We report on the pressure evolution of the Fermi surface topology of the Weyl semimetal NbP, probed by Shubnikov-de Haas oscillations in the magnetoresistance combined with ab-init…
Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
Frank Arnold, Chandra Shekhar, Shu-Chun Wu +15
Weyl semimetals (WSMs) are topological quantum states wherein the electronic bands linearly disperse around pairs of nodes, the Weyl points, of fixed (left or right) chirality. The…