Field-dependent collective ESR mode in YbRh 2 Si 2

Magnetic-field induced quantum critical point in YbRh(2)Si(2).

We report low-temperature calorimetric, magnetic, and resistivity measurements on the antiferromagnetic (AF) heavy-fermion metal YbRh(2)Si(2) ( T(N)=70 mK) as a function of magnetic field B. While for fields exceeding the critical value B(c0) at which T(N)-->0 the low-temperature resistivity shows an AT2 dependence, a 1/(B-B(c0)) divergence of A(B) upon reducing B to B(c0) suggests singular sca...

ESR 2 ( Estrogen Receptor 2 ( ER beta ) )

High - field ESR Studies of the Quantum Spin Dimer System Ba 3 Cr 2 O

Results of systematic high-frequency electron spin resonance (ESR) studies of Ba3Cr2O8, a weakly coupled S = 2 dimer system, in magnetic fields up to 25 T are reported. Two pairs of ESR gapped modes corresponding to transitions from a spin-singlet ground state to the first excited triplet states with gaps, AB = 563 GHz and CD = 399 GHz, are revealed below Hc1 = 12.5 T. The detection of the grou...

2 00 6 High - field ESR studies of the quantum spin magnet

We report an electron spin resonance (ESR) study of the s = 1/2-Heisenberg pseudo-ladder magnet CaCu 2 O 3 in pulsed magnetic fields up to 40 T. At sub-Terahertz frequencies we observe an ESR signal originating from a small amount of uncompensated spins residing presumably at the imperfections of the strongly antiferromagnetically correlated host spin lattice. The data give evidence that these ...

SUSCEPTIBILITY MAGNETIC AND HIGH MAGNETIC FIELD ESR MEASUREMENT OF SrCu2(PO4)2

The magnetic susceptibility and high magnetic ESR measurement of SrCu2(PO4)2 has been performed at temperatures ranging from 4.2 K to 300 K and 4.2 K to 77 K, respectively. The magnetic susceptibility shows a broad maximum around T = 40 K. The magnetic susceptibility has been interpreted in terms of one-dimensional magnetic systems. The temperature dependence of the magnetic susceptibility indi...