Zero-field muon spin relaxation studies of frustrated magnets: physics and analysis issues

Ryan, D. H.; Lierop, J. van; Cadogan, J. M.

doi:10.1088/0953-8984/16/40/012

Cited by 13 publications

(22 citation statements)

References 57 publications

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“…Since, G z (t) is a measure of muon depolarization, one can get significant information on the magnetic state of the material out of it. 27,28 For a typical magnetic material, the relaxing part of the asymmetry often obeys an exponential law, G z = A 0 exp (−λt), where A 0 is the initial asymmetry, and λ is the (spin-lattice) relaxation rate. For the present Ni-Mn-Sn alloy, the simple exponential law is found to be inadequate to describe the data at all temperatures.…”

Section: Iii1 Muon Spin Relaxationmentioning

confidence: 99%

Magnetic states of Ni-Mn-Sn based shape memory alloy: A combined muon spin relaxation and neutron diffraction study

et al. 2019

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The fascinating multiple magnetic states observed in the Ni-Mn-Sn based metamagnetic shape memory alloy are addressed through a combined muon spin relaxation (µSR) and neutron powder diffraction studies. The material used in the present investigation is an off-stoichiometric alloy of nominal composition, Ni2.04Mn1.4Sn0.56. This prototypical alloy, similar to other members in the Ni-Mn-Sn series, orders ferromagnetically below TCA (= 320 K), and undergoes martensitic type structural transition at TMS (= 290 K), which is associated with the sudden loss of magnetization. The sample regains its magnetization below another magnetic transition at TCM = 260 K. Eventually, the composition shows a step-like anomaly at TB = 120 K, which is found to coincide with the blocking temperature of exchange bias effect observed in the alloy. In our study, the initial asymmetry (A10 ) of the µSR data falls rapidly below TCA, indicating the onset of bulk magnetic order. A10 regains its full asymmetry value below TMS suggesting the collapse of the ferromagnetic order into a fully disordered paramagnetic state. Below the second magnetic transition at TCM , asymmetry drops again, confirming the re-entrance of a long range ordered state. Interestingly, A10 increases sluggishly below TB, indicating that the system attains a disordered/glassy magnetic phase below TB, which is responsible for the exchange bias and frequency dispersion in the ac susceptibility data as previously reported. The neutron powder diffraction data do not show any magnetic superlattice reflections, ruling out the possibility of a long range antiferromagnetic state at low temperatures. The ground state is likely to be comprised of a concentrated metallic spin-glass in the backdrop of an ordered ferromagnetic state.

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Section: Iii1 Muon Spin Relaxationmentioning

confidence: 99%

Magnetic states of Ni-Mn-Sn based shape memory alloy: A combined muon spin relaxation and neutron diffraction study

et al. 2019

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“…(1) A similar approach was previously employed in the frustrated magnet α-Zr 1−x Fe x [41] and the significant nonzero slope of the relaxation at early times makes exp(−λt) cos(2πνt + ϕ) more suitable than the exp(−σ 2 t 2 )J 0 (ωt) factor with 0 derivative at t → 0 used for the double-spiral system CeAl 2 [42].…”

Section: Local Magnetism From Muon Spin Relaxationmentioning

confidence: 99%

“…In order to explain the lack of the nonrelaxing tail below T N in the ZF data, let us note that in both the case of α-Zr 1−x Fe x [41] and CeAl 2 [42], the importance of additional spatial field averaging is highlighted, which is caused by the fast muon The stretched exponent form of relaxation [Eq. (2)] used above the T N was found to model the data better than the sum of two exponents in Eq.…”

Section: Local Magnetism From Muon Spin Relaxationmentioning

confidence: 99%

Structure and magnetism in the bond-frustrated spinelZnCr2Se4

Zajdel

Beek

et al. 2017

Phys. Rev. B

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The crystal and magnetic structures of stoichiometric ZnCr 2 Se 4 have been investigated using synchrotron x-ray and neutron powder diffraction, muon spin relaxation (µSR), and inelastic neutron scattering. Synchrotron x-ray diffraction shows a spin-lattice distortion from the cubic Fd3m spinel to a tetragonal I 4 1 /amd lattice below T N = 21 K, where powder neutron diffraction confirms the formation of a helical magnetic structure with magnetic moment of 3.04(3) µ B at 1.5 K, close to that expected for high-spin Cr 3+ . µSR measurements show prominent local spin correlations that are established at temperatures considerably higher (<100 K) than the onset of long-range magnetic order. The stretched exponential nature of the relaxation in the local spin-correlation regime suggests a wide distribution of depolarizing fields. Below T N , unusually fast (>100 µs −1 ) muon relaxation rates are suggestive of rapid site hopping of the muons in static field. Inelastic neutron scattering measurements show a gapless mode at an incommensurate propagation vector of k = [000.4648(2)] in the low-temperature magnetic ordered phase that extends to 0.8 meV. The dispersion is modeled by a two-parameter Hamiltonian, containing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions with a J nnn /J nn =−0.337.

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“…The dependence of magnetic field H on T*. The splintering off of temperature dependence of ZFC and FC magnetization for metglasses [6][7][8] and superconductors. [9][10][11] Legend is in Table 1.…”

Section: Short Notesmentioning

confidence: 99%

The universality of the magnetization irreversibility line of metglasses and superconductors

Sirenko

Eremenko

2014

Low Temperature Physics

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An analysis of the experimental data of the temperature dependence of metallic glass and superconductor magnetization. A common feature is the irreversibility of magnetization: below a certain temperature T*, under fixed field strength, magnetization varies during cooling within (MFC), and outside (MZFC) of a magnetic field. It is demonstrated that for all samples, the line T*(H) is universal, and corresponds to the theoretical dependence of de Almeida-Thouless (T* ∼ H2/3) in all studied ranges of magnetic fields.

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Zero-field muon spin relaxation studies of frustrated magnets: physics and analysis issues

Cited by 13 publications

References 57 publications

Magnetic states of Ni-Mn-Sn based shape memory alloy: A combined muon spin relaxation and neutron diffraction study

Magnetic states of Ni-Mn-Sn based shape memory alloy: A combined muon spin relaxation and neutron diffraction study

Structure and magnetism in the bond-frustrated spinelZnCr2Se4

The universality of the magnetization irreversibility line of metglasses and superconductors

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