Experimental exploration of novel semimetal state in strong anisotropic Pyrochlore iridate Nd2lr2O7 under high magnetic field

TMU International Symposium on "New Quantum Phases Emerging from Novel Crystal Structure"

Tian, Z.M.^1 ; Kohama, Y.^1 ; Tomita, T.^1 ; Ishikawa, J.^1 ; Mairo, H.^1 ; Kindo, K.^1 ; Nakatsuji, S.^1,2

Institute for Solid State Physics, University of Tokyo, Chiba, Kashiwa

277-8581, Japan^1

PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama

332-0012, Japan^2

关键词: Critical fields;    Field induced;    High magnetic fields;    Hysteresis behavior;    Pyrochlores;    Spin structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/683/1/012024/pdf
DOI  :  10.1088/1742-6596/683/1/012024

来源: IOP

【 摘 要 】

We report the anisotropic magnetotransport of Nd2Ir2O7single crystal under high magnetic field (B) up to 50 T with B along various directions. Only for B // [001] direction, a novel semimetal state is realized under high magnetic field evidenced by a field-induced insulating-semimetalic phase transition with critical field BMI∼12 T related to the destruction of all-in-all-out (AIAO) state. In contrast, abnormal magnetotransport hysteresis behavior is observed for B // [111] direction below the metal-insulator transition temperature (TMI), and magnetotransport reveals the Ir spin structure keep in the AIAO state under high magnetic field with temperature just below TMI, in prospect to realize Weyl semimetal state.