Cluster spin glass correlations and dynamics in Zn${}_{0.5}$Mn${}_{0.5}$Te

Abstract

We present a magnetometry, muon spin relaxation ($\mu$SR), and neutron scattering study of the insulating face-centered-cubic spin glass Zn${}_{0.5}$Mn${}_{0.5}$Te. The magnetometry and $\mu$SR results confirm a spin freezing transition around $T_f\approx 23$ K, with the spin fluctuation rate decreasing gradually and somewhat inhomogeneously through the sample volume as the temperature decreases toward $T_f$. Characteristic spin correlation times well above $T_f$ are on the order of 10${}^{-10}$ s, in line with expectations for a cluster spin glass. Using magnetic pair distribution function (mPDF) analysis and reverse Monte Carlo (RMC) modeling of the magnetic diffuse neutron scattering data, we show that the spin-glass ground state consists of clusters of spins exhibiting short-range-ordered type-III antiferromagnetic correlations, with a locally ordered moment of 3.1(1) ${\mu }_{\mathrm{B}}$ between nearest-neighbor spins. The type-III correlations decay exponentially as a function of spin separation distance with a correlation length of approximately 5 Å. The diffuse magnetic scattering and corresponding mPDF show no significant changes across $T_f$, indicating that the dynamically fluctuating short-range spin correlations in the paramagnetic state retain the same basic type-III configuration; the only change apparent from the neutron scattering data is a gradual reduction of the correlation length and locally ordered moment with increasing temperature. Taken together, these results paint a unique and detailed picture of the local magnetic structure and dynamics in Zn${}_{0.5}$Mn${}_{0.5}$Te and show that this material is best described as a cluster spin glass. In addition, this work showcases a statistical method for extracting diffuse scattering signals from neutron powder diffraction data.

References in corpus (23)

• Tutorial: A Beginner's Guide to Interpreting Magnetic Susceptibility Data with the Curie-Weiss Law
• musrfit: A free platform-independent framework for muSR data analysis
• Ordering and Broken Symmetry in Short-Ranged Spin Glasses
• Structural, Electronic, and Magnetic Properties of MnO
• Empirical Magnetic Structure of Frustrated Spin Systems
• Magnetic structure determination from the magnetic pair distribution function (mPDF): ground state of MnO
• Verification of Anderson superexchange in MnO via magnetic pair distribution function analysis and \textit{ab initio} theory
• Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric
• Neutron scattering investigation of proposed Kosterlitz-Thouless transitions in the triangular-lattice Ising antiferromagnet TmMgGaO4
• Local nuclear and magnetic order in the two-dimensional spin glass, Mn${}_{0.5}$Fe${}_{0.5}$PS${}_3$
• Model-free reconstruction of magnetic correlations in frustrated magnets
• Gd pyrochlore under a staggered molecular field in Gd${}_2$Ir${}_2$O${}_7$
• Real-space investigation of short-range magnetic correlations in fluoride pyrochlores NaCaCo${}_2$F${}_7$ and NaSrCo${}_2$F${}_7$ with magnetic pair distribution function analysis
• DIFFPY.MPDF: Open-source software for magnetic pair distribution function analysis
• Superparamagnetic dynamics and blocking transition in Fe${}_3$O${}_4$ nanoparticles probed by vibrating sample magnetometry and muon spin relaxation
• A New Spin on Material Properties: Local Magnetic Structure in Functional and Quantum Materials
• Spin Correlations in the Dipolar Pyrochlore Antiferromagnet Gd2Sn2O7
• Fluctuation-Induced Interactions and the Spin Glass Transition in $F{e}_{2}Ti{O}_5$
• Quantitative investigation of the short-range magnetic correlations in candidate quantum spin liquid NaYbO${}_2$
• Magnetic Pair Distribution Function Data Using Polarized Neutrons and ad hoc Corrections
• Muon Spin Relaxation and Neutron Diffraction Studies of Cluster-Glass States in Sr1-xLaxRuO3
• Uniform structural phase transition in V${}_2$O${}_3$ without short-range distortions of the local structure
• Neutron Scattering Study of Fluctuating and Static Spin Correlations in the Anisotropic Spin Glass Fe${}_2$TiO${}_5$