We report longitudinal ultrasound velocity measurements for magnetic fields up to 33 T applied parallel to the a-axis of the heavy electron compound UPt$_{3}$. A characteristic dip in the sound velocity at the metamagnetic critical field, $H_{c}=20$ T, reported in earlier work is reproduced and shown to be independent of temperature at very low temperatures. We show that the single energy scale model (B.S. Shivaram et al., Phys. Rev. B89, 241107(R), 2014) captures the observed key features of the field dependence in the sound velocity shift, $δv_{s}$. The shift $δv_{s}$ at $H_{c}$ is found to be inversely dependent on temperature above 3\thinspace K and assumes a fixed value at low T. This saturation in $δv_{s}$ below 3 K is accounted for by level broadening of the Uranium spin states.
Strongly correlated electronic systems can harbor a rich variety of quantum spin states. Understanding and controlling such spin states in quantum materials is of great current interest. Focusing on the simple binary system UPt3 with ultrasound (US) as a probe we identify clear signatures in field sweeps demarkating new high field spin states. Magnetostriction (MS) measurements performed up to 65 T also show signatures at the same fields confirming these state transitions. At the very lowest temperatures (<200 mK) we also observe magneto-acoustic quantum oscillations which for theta = 90° and …
We report, for the first time, measurements of the third order, $χ_3$ and fifth order, $χ_5$, susceptibilities in an itinerant oxide metamagnet, Sr$_3$Ru$_2$O$_7$ for magnetic fields both parallel and perpendicular to the c-axis. These susceptibilities exhibit maxima in their temperature dependence such that $T_1 \approx 2T_3 \approx 4T_5$ where the $T_i$ are the position in temperature where a peak in the $i$-th order susceptibility occurs. These features taken together with the scaling of the critical field with the temperature $T_1$ observed in a diverse variety of itinerant metamagnets fin…
We report complex metamagnetic transitions in single crystals of the new low carrier Kondo antiferromagnet YbRh3Si7. Electrical transport, magnetization, and specific heat measurements reveal antiferromagnetic order at T_N = 7.5 K. Neutron diffraction measurements show that the magnetic ground state of YbRh3Si7 is a collinear antiferromagnet where the moments are aligned in the ab plane. With such an ordered state, no metamagnetic transitions are expected when a magnetic field is applied along the c axis. It is therefore surprising that high field magnetization, torque, and resistivity measure…
Anisotropic metamagnetism and magnetotransport of heavy rare-earth orthorhombic single-crystal TbAlGe
University of Maryland, College Park（马里兰大学帕克分校）；Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）；National High Magnetic Field Laboratory, Tallahassee（国家高磁场实验室（塔拉哈西））
We investigated the thermodynamic property of the heavy fermion superconductor UTe$_2$ in pulsed high magnetic fields. The superconducting transition in zero field was observed at $T_{\rm c}$=1.65 K as a sharp heat capacity jump. Magnetocaloric effect measurements in pulsed-magnetic fields obviously detected a thermodynamic anomaly accompanied by a first-order metamagnetic transition at $μ$$_{0}$$H_{\rm m}$=36.0 T when the fields are applied nearly along the hard-magnetization $b$-axis. From the results of heat capacity measurements in magnetic fields, we found a drastic diverging electronic h…
CeRh$_3$Si$_2$ has been reported to exhibit metamagnetic transitions below 5~K, a giant crystal field splitting, and anisotropic magnetic properties from single crystal magnetization and heat capacity measurements. Here we report results of neutron and x-ray scattering studies of the magnetic structure and crystal-field excitations to further understand the magnetism of this compound. Inelastic neutron scattering (INS) and resonant inelastic x-ray scattering (RIXS) reveal a $J_z$\,=\,1/2 groundstate for Ce when considering the crystallographic $a$ direction as quantization axis, thus explainin…
High-field metamagnetism in the antiferromagnet CeRh$_2$Si$_2$
本文研究了反铁磁体CeRh $_2$ Si $_2$在高达50特斯拉的脉冲磁场中的转矩、磁致伸缩和输运以及在高达13特斯拉的静磁场中的热膨胀。从这些测量中推导出CeRh $_2$ Si $_2$的磁场-温度相图，其中磁场沿易磁化轴$\mathbf{c}$施加。二级相变温度$T_{N}$和一级相变温度$T_{1,2}$（零场时分别为~36 K和26 K）随电场的增加而降低。场致反铁磁-顺磁边界线$H_c$在1.5 K时为26 T，从低温时的一阶变为高温时的二阶。磁场-温度相图被发现是由（至少）三个不同的反铁磁相。它们被一阶谱线$H_{1,2}$和$H_{2,3}$分开，前者对应于H=0时的$T_{1,2}$，后者在1.5 K时等于25.5 T。的最大值的$T^2$ -系数$A$的电阻率观察在发病的高场极化制度，这被解释为一个增强的有效质量的签名在场诱导的量子不稳定性。将CeRh $_2$ Si $_2$中$A$系数的磁场依赖性与其压力依赖性进行了比较，并与原型重费米子系统CeRu $_2$ Si $_2$中$A$的场依赖性进行了比较。
Metamagnetism in UTe2: the roles of itinerancy and localization
Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）；Department of Physics, University of Wisconsin-Madison（威斯康星大学麦迪逊分校物理系）；National High Magnetic Field Laboratory（国家高磁场实验室）；Department of Physics, Washington University in St. Louis（圣路易斯华盛顿大学物理系）；School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；Department of Physics, Clarendon Laboratory, University of Oxford（牛津大学克拉伦登实验室物理系）；Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理国家实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf（德累斯顿强磁实验室（HLD-EMFL），德累斯顿-罗斯多夫亥姆霍兹中心）；Charles University, Faculty of Mathematics and Physics（查理大学数学与物理学院）
