Abstract
Motivated by the recent discovery of unconventional superconductivity around a magnetic quantum critical point in pressurized CeSb2,here we present a high-pressure study of an isostructural antiferromagnetic(AFM)SmSb2 through electrical transport and synchrotron x-ray diffraction measurements.At PC～2.5 GPa,we found a pressure-induced mag-netic phase transition accompanied by a Cmca→ P4/nmm structural phase transition.In the pristine AFM phase below PC,the AFM transition temperature of SmSb2 is insensitive to pressure;in the emergent magnetic phase above PC,however,the magnetic critical temperature increases rapidly with increasing pressure.In addition,at ambient pressure,the magne-toresistivity(MR)of SmSb2 increases suddenly upon cooling below the AFM transition temperature and presents linear nonsaturating behavior under high field at 2 K.With increasing pressure above PC,the MR behavior remains similar to that observed at ambient pressure,both in terms of temperature-and field-dependent MR.This leads us to argue an AFM-like state for SmSb2 above PC.Within the investigated pressure of up to 45.3 GPa and the temperature of down to 1.8 K,we found no signature of superconductivity in SmSb2.
基金项目
国家重点研发计划(2023YFA1406102)
国家重点研发计划(2022YFA1602603)
国家自然科学基金(12374049)
国家自然科学基金(12174395)
中国博士后科学基金(2023M743542)
Hefei Institutes of Physical Science,Chinese Academy of Sciences the Director's Fundation of(YZJJ2024QN41)
Basic Research Program of the Chinese Academy of Sciences Based on Major Scientific Infrastructures(JZHKYPT-2021-08)
NETL
NSTL
万方数据