Zobrazeno 1 - 10
of 9 001
pro vyhledávání: '"Johnston, D."'
Autor:
Ning, Zhenhua, Das, Pinaki, Lee, Y., Sangeetha, N. S., Abernathy, D. L., Johnston, D. C., McQueeney, R. J., Vaknin, D., Ke, Liqin
SrCr$_2$As$_2$ is an itinerant antiferromagnet in the same structural family as the SrFe2As2 high-temperature superconductors. We report our calculations of exchange coupling parameters $J_{ij}$ for SrCr$_2$As$_2$ using a static linear-response metho
Externí odkaz:
http://arxiv.org/abs/2408.05583
Autor:
Pakhira, Santanu, Johnston, D. C.
EuSn$_2$As$_2$ is a trigonal A-type antiferromagnetic topological insulator with the moments aligned in the $ab$ plane and with a N\'eel temperature $T_{\rm N} = 23.5$ K. Here we report that an EuSn$_2$As$_2$ crystal exhibits a broad peak at $H_{\rm
Externí odkaz:
http://arxiv.org/abs/2403.19013
Autor:
Han, Tianxiong, Pakhira, Santanu, Sangeetha, N. S., Riberolles, S. X. M., Heitmann, T. W., Wu, Yan, Johnston, D. C., McQueeney, R. J., Ueland, B. G.
Publikováno v:
Phys. Rev. B 109, 174428 (2024)
We report neutron diffraction results for the body-centered-tetragonal series Eu(Co$_{1-x}$Ni$_x$)$_{2-y}$As$_2$, $x=0.10$, $0.20$, $0.42$, and $0.82$, $y\leq0.10$, that detail changes to the magnetic ordering with nominal hole doping. We report the
Externí odkaz:
http://arxiv.org/abs/2402.06773
Publikováno v:
Condensed Matter Physics, 2024, Vol. 27, No. 3, 33601
We discuss the distribution of partition function zeros for the grand-canonical ensemble of the zeta-urn model, where tuning a single parameter can give a first or any higher order condensation transition. We compute the locus of zeros for finite-siz
Externí odkaz:
http://arxiv.org/abs/2312.01806
Autor:
Dissanayake, C., Jacko, A. C., Kumarasinghe, K., Munir, R., Siddiquee, H., Newsome, W. J., Uribe-Romo, F. J., Choi, E. S., Yadav, S., Hu, X. -Z., Takano, Y., Pakhira, S., Johnston, D. C., Ding, Q. -P., Furukawa, Y., Powell, B. J., Nakajima, Y.
Publikováno v:
Phys. Rev. B 108, 134418 (2023)
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$_2$H$_5$)$_3$NH]$_2$Cu$_2$(C$_2$O$_4$)$_3$. The specific heat shows no an
Externí odkaz:
http://arxiv.org/abs/2306.13598
We consider Dirichlet $L$-functions $L(s, \chi)$ where $\chi$ is a non-principal quadratic character to the modulus $q$. We make explicit a result due to Pintz and Stephens by showing that $|L(1, \chi)|\leq \frac{1}{2}\log q$ for all $q\geq 2\cdot 10
Externí odkaz:
http://arxiv.org/abs/2303.13785
Autor:
Pakhira, Santanu, Kundu, Asish K., Islam, Farhan, Tanatar, M. A., Roy, Tufan, Heitmann, Thomas, Yilmaz, T., Vescovo, E., Tsujikawa, Masahito, Shirai, Masafumi, Prozorov, R., Vaknin, David, Johnston, D. C.
Publikováno v:
Phys. Rev. B 107, 134439 (2023); 16 pages
The magnetic and electronic properties of the layered Zintl-phase compound EuAl$_2$Ge$_2$ crystallizing in the trigonal CaAl$_2$Si$_2$-type structure are reported. Our neutron-diffraction measurements show that EuAl$_2$Ge$_2$ undergoes A-type antifer
Externí odkaz:
http://arxiv.org/abs/2301.09613
Autor:
Pakhira, Santanu, Johnston, D. C.
The body-centered-tetragonal antiferromagnet EuGa$_4$ was recently identified as a Weyl nodal-line semimetal that exhibits the topological Hall effect below its reported antiferromagnetic (AFM) ordering temperature $T_{\rm N}= 15$-16.5 K which we fin
Externí odkaz:
http://arxiv.org/abs/2209.14776
Autor:
Kundu, Asish K., Pakhira, Santanu, Roy, Tufan, Yilmaz, T., Tsujikawa, Masahito, Shirai, Masafumi, Vescovo, E., Johnston, D. C., Pasupathy, Abhay N., Valla, Tonica
Publikováno v:
Phys. Rev. B 106, 245131 (2022)
Dirac semimetals show nontrivial physical properties and can host exotic quantum states like Weyl semimetals and topological insulators under suitable external conditions. Here, by combining angle-resolved photoemission spectroscopy measurements (ARP
Externí odkaz:
http://arxiv.org/abs/2209.12109