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Gapless spinons and a field-induced soliton gap in the hyper-honeycomb Cu oxalate framework compound [(CH)NH]Cu(CO)
C. Dissanayake, A. C. Jacko, K. Kumarasinghe +14
We report a detailed study of the specific heat and magnetic susceptibility of single crystals of a spin liquid candidate: the hyper-honeycomb Cu oxalate framework compound [(C…
Temperature-dependent Eu spin reorientations in the tetragonal A-type antiferromagnet EuGa induced by small ab-plane magnetic fields
Santanu Pakhira, David C. Johnston
The body-centered-tetragonal antiferromagnet EuGa exhibits A-type antiferromagnetic order below its Néel temperature K in magnetic field where the mo…
Anisotropic magnetism and electronic structure of trigonal EuAlGe single crystals
Santanu Pakhira, Asish K. Kundu, Farhan Islam +10
The magnetic and electronic properties of the layered Zintl-phase compound EuAlGe crystallizing in the trigonal CaAlSi-type structure are reported. Our neutron-diff…
Low-field magnetic anomalies in single crystals of the A-type square-lattice antiferromagnet EuGa
Santanu Pakhira, D. C. Johnston
The body-centered-tetragonal antiferromagnet EuGa was recently identified as a Weyl nodal-line semimetal that exhibits the topological Hall effect below its reported antiferrom…
Electronic and magnetic properties of the topological semimetal SmMgBi
Asish K. Kundu, Santanu Pakhira, Tufan Roy +7
Dirac semimetals show nontrivial physical properties and can host exotic quantum states like Weyl semimetals and topological insulators under suitable external conditions. Here, by…
Magnetic-field-induced ab-plane rotation of the Eu magnetic moments in trigonal EuMg2Bi2 and EuMg2Sb2 single crystals below their Neel temperatures
Santanu Pakhira, Yongbin Lee, Liqin Ke +1
The thermodynamic and electronic-transport properties of trigonal EuMg2Bi2 in ab-plane magnetic fields Hx and the A-type antiferromagnetic structure have recently been reported. At…
Frustrated Magnetic Cycloidal Structure and Emergent Potts Nematicity in CaMnP
Farhan Islam, Thaís V. Trevisan, Thomas Heitmann +6
We report neutron-diffraction results on single-crystal CaMnP containing corrugated Mn honeycomb layers and determine its ground-state magnetic structure. The diffraction p…
A-type antiferromagnetic order in semiconducting EuMgSb single crystals
Santanu Pakhira, Farhan Islam, Evan O'Leary +6
Eu-based Zintl-phase materials EuAPn (A = Mg, In, Cd, Zn; Pn = Bi, Sb, As, P) have generated significant recent interest owing to the complex interplay of magnetism and ban…
Itinerant G-type antiferromagnet SrCr2As2 studied by magnetization, heat capacity, electrical resistivity, and NMR measurements
Q. -P. Ding, Santanu Pakhira, N. S. Sangeetha +6
The physical properties of itinerant antiferromagnetic (AFM) SrCrAs with body-centered tetragonal ThCrSi structure were investigated in single crystalline and polyc…
Slow spin dynamics in the hyper-honeycomb Lattice [(C2H5)3NH]2Cu2(C2O4)3 revealed by 1H NMR studies
Q. -P. Ding, C. Dissanayake, Santanu Pakhira +5
We report the results of magnetic susceptibility and H nuclear magnetic resonance (NMR) measurements on a three-dimensional hyper-honeycomb lattice compound [(CH)$_…
KCoAs: A New Portal for the Physics of High-Purity Metals
Abhishek Pandey, Y. Liu, Saroj L. Samal +4
High-quality single crystals of KCoAs with the body-centered tetragonal ThCrSi structure were grown using KAs self flux. Structural, magnetic, thermal, and electric…
Suppression of antiferromagnetic order and strong ferromagnetic spin fluctuations in Ni-doped CaCo2As2 single crystals
Santanu Pakhira, Y. Lee, Liqin Ke +5
CaCo2As2 is a unique itinerant system having strong magnetic frustration. Here we report the effect of electron doping on the physical properties resulting from Ni substitutions fo…
A-type antiferromagnetic order and magnetic phase diagram of the trigonal Eu spin-7/2 triangular-lattice compound EuSn2As2
Santanu Pakhira, M. A. Tanatar, Thomas Heitmann +2
The trigonal compound EuSn2As2 was recently discovered to host Dirac surface states within the bulk band gap and orders antiferromagnetically below the Neel temperature TN = 24 K.…
First-order transitions at the Neel temperatures of trigonal SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices
N. S. Sangeetha, Santanu Pakhira, Q. -P. Ding +5
Single crystals of SrMn2P2 and CaMn2P2 were grown using Sn flux and characterized by single-crystal x-ray diffraction, electrical resistivity rho, heat capacity Cp, and magnetic su…
Carrier Tuning of Stoner Ferromagnetism in ThCrSi-Structure Cobalt Arsenides
B. G. Ueland, Santanu Pakhira, Bing Li +7
CaCoAs is an unusual itinerant magnet with signatures of extreme magnetic frustration. The conditions for establishing magnetic order in such itinerant frustrated magne…
Magnetic detwinning and biquadratic magnetic interaction in EuFe2As2 revealed by 153Eu NMR
Q. -P. Ding, N. S. Sangeetha, W. R. Meier +5
In the nematic state of iron-based superconductors, twin formation often obscures the intrinsic, anisotropic, in-plane physical properties.Relatively high in-plane external magneti…
Magnetic crystalline-symmetry-protected axion electrodynamics and field-tunable unpinned Dirac cones in EuIn2As2
S. X. M. Riberolles, T. V. Trevisan, B. Kuthanazhi +12
Knowledge of magnetic symmetry is vital for exploiting nontrivial surface states of magnetic topological materials. EuInAs is an excellent example, as it is predicted t…
Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals
Santanu Pakhira, M. A. Tanatar, D. C. Johnston
The trigonal compound EuMg2Bi2 has recently been discussed in terms of its topological band properties. These are intertwined with its magnetic properties. Here detailed studies of…
Molecular-field-theory fits to magnetic susceptibilities of antiferromagnetic GdCu2Si2, CuO, LiCrO2, and alpha-CaCr2O4 single crystals below their Neel temperatures
David C. Johnston
A recently-developed molecular field theory (MFT) has been used to fit single-crystal magnetic susceptibility chi versus temperature T data below the respective antiferromagnetic o…
Magnetic phase transitions in Eu(Co,Ni)2As2 single crystals
N. S. Sangeetha, Santanu Pakhira, D. H. Ryan +3
The effects of Ni doping in Eu(Co{1-x}Ni{x})2As2 single crystals with x =0 to 1 grown out of self flux are investigated via crystallographic, electronic transport, magnetic, and th…
Instability and evolution of the magnetic ground state in metallic perovskites GdRhCB
Abhishek Pandey, A. K. Singh, Shovan Dan +7
We report investigations of the structural, magnetic, electrical transport and thermal properties of five compositions of the metallic perovskite GdRhCB ($0.00 \le…
Localized Singlets and Ferromagnetic Fluctuations in the Dilute Magnetic Topological Insulator SnMnTe
D. Vaknin, Santanu Pakhira, D. Schlagel +6
The development of long-range ferromagnetic (FM) order in dilute magnetic topological insulators can induce dissipationless electronic surface transport via the quantum anomalous H…
Non-Fermi-liquid behaviors associated with a magnetic quantum-critical point in Sr(Co{1-x}Ni{x})2As2 single crystals
N. S. Sangeetha, L. L. Wang, A. V. Smirnov +6
Electron-doped Sr(Co{1-x}Ni{x})2As2 single crystals with compositions x = 0 to 0.9 were grown out of self-flux and SrNi2As2 single crystals out of Bi flux. The crystals were charac…
CsMnAs: A layered tetragonal transition-metal pnictide compound with antiferromagnetic ground state
Abhishek Pandey, Saroj L. Samal, David C. Johnston
We report the synthesis and properties of a new layered tetragonal ternary compound CsMnAs (structure: KCuS-type, space group: , No. 123 and ). The m…