Abstract
We investigated the magnetic phase of the perovskite ${\text{CaCrO}}_{3}$ by using the muon-spin relaxation technique accompanied by susceptibility measurements. A thermal hysteresis loop is identified with a width of about 1 K at the transition temperature. Within the time scale of the muon lifetime, a static antiferromagnetic order is revealed with distinct multiple internal fields which are experienced in the muon interstitial sites below the phase-transition temperature, ${T}_{N}=90\text{ }\text{K}$. Above ${T}_{N}$, lattice deformations are indicated by transverse-field muon-spin rotation and relaxation suggesting a magnetoelastic mechanism.
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