Abstract
Chemical pressure is an effective method to tune physical properties, particularly for diluted magnetic semiconductors (DMSs) of which ferromagnetic ordering is mediated by charge carriers. Via substitution of smaller Ca for larger Sr, we introduce chemical pressure on (Sr,Na)(Cd,Mn)2As2 to fabricate a new DMS material (Ca,Na)(Cd,Mn)2As2. Carriers and spins are introduced by substitutions of (Ca,Na) and (Cd,Mn), respectively. The unit cell volume reduces by 6.2% after complete substitution of Ca for Sr, suggesting a subsistent chemical pressure. Importantly, the local geometry of the [Cd/MnAs4] tetrahedron is optimized via chemical compression that increases the Mn–As hybridization leading to enhanced ferromagnetic interactions. As a result, the maximum Curie temperature (TC) is increased by about 50% while the maximum saturation moment increases by over 100% from (Sr,Na)(Cd,Mn)2As2 to (Ca,Na)(Cd,Mn)2As2. The chemical pressure estimated from the equation of state is equal to an external physical pressure of 3.6 GPa.
Highlights
Given a diluted magnetic semiconductors (DMSs) material, effective ways to modify TC can be achieved by increasing the carrier density using an applied electric field, photoexcitations, or pressure.7,12 pressure is expected to increase both carrier concentration and Mn
Via substitution of smaller Ca for larger Sr, we introduce chemical pressure on (Sr,Na)(Cd,Mn)2As2 to fabricate a new DMS material (Ca,Na)(Cd,Mn)2As2
The local geometry of the [Cd/MnAs4] tetrahedron is optimized via chemical compression that increases the Mn–As hybridization leading to enhanced ferromagnetic interactions
Summary
Given a DMS material, effective ways to modify TC can be achieved by increasing the carrier density using an applied electric field, photoexcitations, or pressure.7,12 pressure is expected to increase both carrier concentration and Mn–. ABSTRACT Chemical pressure is an effective method to tune physical properties, for diluted magnetic semiconductors (DMSs) of which ferromagnetic ordering is mediated by charge carriers.
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