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Competing magnetic interactions, frustration driven quantum fluctuations, andspin correlations offer an ideal route for the experimental realization ofemergent quantum phenomena and exotic quasi particle excitations in 3Dfrustrated magnets. In this context, trillium lattice, wherein magnetic ionsdecorate a three-dimensional chiral network of corner-shared equilateraltriangular motifs, provides a viable ground. Herein, we present the crystalstructure, magnetic susceptibility, specific heat, electron spin-resonance,muSR results on the polycrystalline samples of K2CrTi(PO4)3 wherein the Cr3+ions form a perfect trillium lattice without any detectable anti-site disorder.The Curie-Weiss fit of the magnetic susceptibility data above 100 K yields aCurie-Weiss temperature of -23 K, which indicates the presence of dominantantiferromagnetic interactions between Cr3+ (S=3/2) moments. The specific heatmeasurements reveal the occurrence of two consecutive phase transitions, attemperatures TL = 4.3 K and TH = 8 K, corresponding to two different magneticphases and it unveils the existence of short-range spin correlations above theordering temperature TH. The power-law behavior of ESR linewidth suggests thepersistence of short-range spin correlations over a relatively wide criticalregion in agreement with the specific heat results. The muSR resultsprovideconcrete evidence of two different phases corresponding to two transitions,coupled with thecritical slowing down of spin fluctuations above TL andpersistent spin dynamics below TL, consistent with the thermodynamic results.Moreover, the muSR results reveal the coexistence of static and dynamic localmagnetic fields below TL, signifying the presence of complex magnetic phasesowing to the entwining of spin correlations and competing magnetic interactionsin this three-dimensional frustrated magnet.

Magnetism and spin dynamics of an S=3/2 frustrated trillium lattice antiferromagnet K2CrTi(PO4)3