Normal state specific heat in the cuprates La$_{2-x}$Sr$_x$CuO$_4$ and Bi$_{2+y}$Sr$_{2-x-y}$La$_x$CuO$_{6+δ}$ near the critical point of the pseudogap phase

no code implementations • 22 Jan 2021 • C. Girod, D. LeBoeuf, A. Demuer, G. Seyfarth, S. Imajo, K. Kindo, Y. Kohama, M. Lizaire, A. Legros, A. Gourgout, H. Takagi, T. Kurosawa, M. Oda, N. Momono, J. Chang, S. Ono, G. -q. Zheng, C. Marcenat, L. Taillefer, T. Klein

In La$_{2-x}$Sr$_x$CuO$_4$ at $x=p = 0. 22$, $0. 24$ and $0. 25$, $C_e / T = 15-16~{\rm mJmol}^{-1}{\rm K}^{-2}$ at $T = 2~{\rm K}$, values that are twice as large as those measured at higher doping ($p > 0. 3$) and lower doping ($p < 0. 15$).

Superconductivity Strongly Correlated Electrons

Planar Hall effect with sixfold oscillations in a Dirac antiperovskite

no code implementations • 14 Jan 2021 • D. Huang, H. Nakamura, H. Takagi

The planar Hall effect (PHE), wherein a rotating magnetic field in the plane of a sample induces oscillating transverse voltage, has recently garnered attention in a wide range of topological metals and insulators.

Mesoscale and Nanoscale Physics

Tunneling-tip-induced collapse of the charge gap in the excitonic insulator Ta$_2$NiSe$_5$

no code implementations • 15 Dec 2020 • Q. He, X. Que, L. Zhou, M. Isobe, D. Huang, H. Takagi

The layered chalcogenide Ta$_2$NiSe$_5$ has been recently discussed as such an excitonic insulator with an excitation gap of ~250 meV below $T_c$ = 328 K. Here, we demonstrate a drastic collapse of the excitation gap in Ta$_2$NiSe$_5$ and the realization of a zero-gap state by moving the tip of a cryogenic scanning tunneling microscope towards the sample surface by a few angstroms.

Strongly Correlated Electrons Mesoscale and Nanoscale Physics

First measurement using a nuclear emulsion detector of the $ν_μ$ charged-current cross section on iron around the 1$\,$GeV energy region

no code implementations • 9 Dec 2020 • H. Oshima, T. Matsuo, A. Ali, S. Aoki, L. Berns, T. Fukuda, Y. Hanaoka, Y. Hayato, A. Hiramoto, A. K. Ichikawa, H. Kawahara, T. Kikawa, R. Komatani, M. Komatsu, K. Kuretsubo, T. Marushima, H. Matsumoto, S. Mikado, A. Minamino, K. Mizuno, Y. Morimoto, K. Morishima, N. Naganawa, M. Naiki, M. Nakamura, Y. Nakamura, N. Nakano, T. Nakano, T. Nakaya, A. Nishio, T. Odagawa, S. Ogawa, H. Rokujo, O. Sato, H. Shibuya, K. Sugimura, L. Suzui, Y. Suzuki, H. Takagi, S. Takahashi, T. Takao, Y. Tanihara, R. Watanabe, K. Yamada, K. Yasutome, M. Yokoyama

The data samples correspond to 4. 0$\times$10$^{19}$ protons on target, and the neutrino mean energy is 1. 49$\,$GeV.

High Energy Physics - Experiment