We report a systematic study on layered metal SrCu_(4-x)P_(2) single crystals via transport, magnetization, thermodynamic measurements and structural characterization. We find that the crystals show large linear magne...We report a systematic study on layered metal SrCu_(4-x)P_(2) single crystals via transport, magnetization, thermodynamic measurements and structural characterization. We find that the crystals show large linear magnetoresistance without any sign of saturation with a magnetic field up to 30T. We also observe a phase transition with significant anomalies in resistivity and heat capacity at T_(p)~140 K. Thermal expansion measurement reveals a subtle lattice parameter variation near Tp, i.e.,?L_(c)/L_(c)~0.062%. The structural characterization confines that there is no structure transition below and above T_(p). All these results suggest that the nonmagnetic transition of SrCu_(4-x)P_(2) could be associated with structural distortion.展开更多
基金Project supported by the National Key Research and Development Program of China (Grant Nos.2023YFA1607403,2021YFA1600201,and 2022YFA1602603)the Natural Science Foundation of China (Grant Nos.U19A2093,U2032214,and U2032163)+5 种基金the Collaborative Innovation Program of Hefei Science Center,CAS (Grant No.2019HSC-CIP 001)the Youth Innovation Promotion Association of CAS (Grant No.2021117)the Natural Science Foundation of Anhui Province (No.1908085QA15)the HFIPS Director’s Fund (Grant No.YZJJQY202304)the CASHIPS Director’s Fund (Grant No.YZJJ2022QN36)supported by the High Magnetic Field Laboratory of Anhui Province。
文摘We report a systematic study on layered metal SrCu_(4-x)P_(2) single crystals via transport, magnetization, thermodynamic measurements and structural characterization. We find that the crystals show large linear magnetoresistance without any sign of saturation with a magnetic field up to 30T. We also observe a phase transition with significant anomalies in resistivity and heat capacity at T_(p)~140 K. Thermal expansion measurement reveals a subtle lattice parameter variation near Tp, i.e.,?L_(c)/L_(c)~0.062%. The structural characterization confines that there is no structure transition below and above T_(p). All these results suggest that the nonmagnetic transition of SrCu_(4-x)P_(2) could be associated with structural distortion.
文摘目的 探讨CT引导下微弹簧圈定位与医用胶结合亚甲蓝(MGMB)定位在孤立性肺结节(SPN)电视胸腔镜手术(VATS)前定位中的临床价值,并分析定位后发生并发症的危险因素。方法 选取我院收治的292例SPN患者,分为微弹簧圈组129例,MGMB组163例,比较两种定位技术的安全性和成功率,以及潜在临床价值。结果 所有患者均于VATS术前36 h内完成定位,相比于微弹簧圈组,MGMB组的定位时间更短(7.42±2.58 vs 14.80±3.60)min,差异有统计学意义(P<0.001),住院时间更短(5.67±2.16 vs 10.26±3.69)天,差异有统计学意义(P<0.001)。两组术前定位成功率分别为96.9%(125/129)和100%(163/163)。定位过程中无死亡或严重并发症发生,两组并发症发生率差异无统计学意义(P=0.902)。Logistic回归分析显示,定位时间是总并发症发生的危险因素(OR=1.119,95%可信区间,1.002~1.249,P=0.045)。结论 两种技术都可以在VATS之前安全有效地定位SPN,但MGMB组的定位时间及住院时间更短,实用性及潜在的临床价值更高,值得临床推广。