How can the plasma state be achieved without the prerequisiteof a very high temperature?

Answer 1

It can be achieved only by ionizing the atoms at high temperatures

Answer 2

Gas molecules can be ionized by the application of very strong electric fields. They are not at high temperature at first, but the ions will move under the influence of the field and heat the gas. This is what happens in an electrical discharge (lightning). The individual atom are in a high energy state when ionized, but the gas temperature refers to the kinetic energy of the gas atoms, which may not be high even if the atoms are ionized.

Answer 3

A characteristic of the plasma state is the high energy level of the constituent matter. Temperature is by definition the measure of this high energy level.

However, if your question was whether this state can be achieved without application of heat in trhe traditional sense, I believe this has already been done with the use of tuned lasers.