High-field metamagnetism in the antiferromagnetCeRh2Si2

Abstract

A study of the antiferromagnet CeRh2Si2 by torque, magnetostriction, and transport in pulsed magnetic fields up to 50 Tesla and by thermal expansion in static fields up to 13 Tesla is presented. The magnetic field-temperature phase diagram of CeRh2Si2, where the magnetic field is applied along the easy axis c, is deduced from these measurements. The second-order phase transition temperature TN and the first-order phase transition temperature T1,2 (= 36 K and 26 K at zero-field, respectively) decrease with increasing field. The field-induced antiferromagnetic-to-paramagnetic borderline Hc, which equals 26 T at 1.5 K, goes from first-order at low temperature to secondorder at high temperature. The magnetic field-temperature phase diagram is found to be composed of (at least) three different antiferromagnetic phases. These are separated by the first-order lines H1,2, corresponding to T1,2 at H = 0, and H2,3, which equals 25.5 T at 1.5 K. A maximum of the T 2 -coefficient A of the resistivity is observed at the onset of the high-field polarized regime, which is interpreted as the signature of an enhanced effective mass at the field-induced quantum instability. The magnetic field dependence of the A coefficient in CeRh2Si2 is compared with its pressure dependence, and also with the field dependence of A in the prototypal heavy-fermion system CeRu2Si2.

Crystal electric field in CeRh2Si2 studied with high-resolution resonant inelastic soft x-ray scattering

“…This system shows a very interesting phase diagram with AFM order and unconventional superconductivity in close proximity and therefore attracts a lot of attention [12][13][14][15][16]. However, the CEF schemes reported in the literature are contradictory both in terms of the observed energy splittings as well as the symmetry and the anisotropy of the CEF levels of the 2 F 5/2 multiplet [17][18][19][20], and still under debate despite more than 20 years of investigations.…”

High-field irreversible moment reorientation in the antiferromagnet Fe1.1Te

“…The question is whether such theories could help understanding the non-reversible moment reorientation observed here. To go further experimentally, magnetostriction under pulsed magnetic field (by strain gage [36], dilatometry [37], or diffraction techniques [38]) could lead to valuable information about the field-induced distortion of the lattice. Also, the highfield magnetic structure of Fe 1.1 Te could be determined by neutron diffraction in pulsed field [39].…”

Pressure–Temperature–Magnetic Field Phase Diagram of Ferromagnetic Kondo Lattice CeRuPO

“…[1][2][3][4][5][6][7][8][9][10][11] In the antiferromagnetic (AFM) system with Rh, La, and Ge doping, a magnetic field suppresses the ordered phase in the critical field, inducing the MM transition. [2][3][4][5][6][7] Even in the absence of the AFM phase, if the system is located close to the AFM instability, the proximity of the AFM critical field yields the MM transition. In addition to the field evolution of the AFM correlation, the presence of the ferromagnetic (FM) correlation also plays a vital role in the MM transition in CeRu 2 Si 2 , 8 and the FM state is realized on the Ge-rich side in CeRu 2 (Si,Ge) 2 .…”