{"id":{"repo_id":"greece","oai_identifier":"oai:10442/1172"},"canonical_url":"https://search.dev.ndltd.org/etd/greece/oai:10442/1172","repository":{"repo_id":"greece","name":"Greek National Archive of PhD Theses","base_url":"https://phdtheses.ekt.gr/eadd_oai/request"},"display":{"title":"ΜΕΛΕΤΗ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗΣ ΣΕ ΜΟΝΟΚΡΥΣΤΑΛΛΟΥΣ FE7S8","abstract":"THIS IS A STUDY OF THE MAGNETORESISTANCE IN ANTIFERROMAGNETIC SEMICONDUCTORS AND SPECIALLY IN PYRRHOTITE FE7S8 CUT FROM NATURAL SINGLE CRYSTALS (WITH ORIENTATIONS B C AND B// FROM 88 TO 607K. BEYOND THE NEEL POINT TN 600K AND FOR MAGNETIC FIELDS B FROM 0 TO 7 KG. A MAGNETORESISTANCE OF THE ORDER OF 10-3 WHICH IS ALWAYS NEGATIVE FOR SMALL B AND CHANGES SIGN FOR HIGHER MAGNETIC FIELDS WAS OBSERVED. AFTER THIS SIGN REVERSAL AND FOR INTERMEDIATE TEMPERATURES IN THE RANGE FROM 160 TO 400K APPROXIMATELY THE MAGNETORESISTANCE INCREASES MONOTONICALLY WITHB. ALTHOUGH FOR TEMPERATURES OUTSIDE THIS RANGE, ΔΡ/Ρ(O) EXHIBITS AN OSCILLATORY BEHAVIOUR.","abstract_html":"THIS IS A STUDY OF THE MAGNETORESISTANCE IN ANTIFERROMAGNETIC SEMICONDUCTORS AND SPECIALLY IN PYRRHOTITE FE7S8 CUT FROM NATURAL SINGLE CRYSTALS (WITH ORIENTATIONS B C AND B// FROM 88 TO 607K. BEYOND THE NEEL POINT TN 600K AND FOR MAGNETIC FIELDS B FROM 0 TO 7 KG. A MAGNETORESISTANCE OF THE ORDER OF 10-3 WHICH IS ALWAYS NEGATIVE FOR SMALL B AND CHANGES SIGN FOR HIGHER MAGNETIC FIELDS WAS OBSERVED. AFTER THIS SIGN REVERSAL AND FOR INTERMEDIATE TEMPERATURES IN THE RANGE FROM 160 TO 400K APPROXIMATELY THE MAGNETORESISTANCE INCREASES MONOTONICALLY WITHB. ALTHOUGH FOR TEMPERATURES OUTSIDE THIS RANGE, ΔΡ/Ρ(O) EXHIBITS AN OSCILLATORY BEHAVIOUR.","abstract_has_math":false,"creators":["Βιτωράτος, Ευάγγελος"],"institution":"University of Patras","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1989,"date_issued":"1989","date_published":"1989","updated_at":"2026-07-24T02:24:46Z","subjects":["C-1 ΜΟΝΤΕΛΛΟ","Αντισιδηρομαγνητισμός","ΕΚΦΥΛΙΣΜΕΝΟΙ ΗΜΙΑΓΩΓΟΙ","Μαγνητικοί ημιαγωγοί","Μαγνητοαντίσταση","ΠΥΡΡΟΤΙΝΗΣ","ΣΟΥΛΦΙΔΙΑ ΤΟΥ ΣΙΔΗΡΟΥ","ΣΥΜΠΥΚΝΩΜΕΝΗ ΥΛΗ: ΜΑΓΝΗΤΙΚΟΣ ΣΥΝΤΟΝΙΣΜΟΣ","ΦΥΣΙΚΗ ΤΩΝ ΗΜΙΑΓΩΓΩΝ","Antiferromagnetism","C-1 MODEL","CONDENSED MATTER: MAGNETIC RESONANCE","FE7S8","HEAVILY DOPPED SEMICONDUCTORS","IRON SULFIDES","MAGNETIC SEMICONDUCTORS","Magnetoresistance","PYRRHOTITE","SEMI-CONDUCTOR PHYSICS","Φυσικές Επιστήμες","Φυσική","Natural Sciences","Physical Sciences"],"languages":["gre"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/1172"],"render_values":[{"text":"10.12681/eadd/1172","href":"https://doi.org/10.12681/eadd/1172","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10442/hedi/1172","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Βιτωράτος, Ευάγγελος"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1989"]},{"key":"dc:publisher","label":"Institution","values":["University of Patras","Πανεπιστήμιο Πατρών"]},{"key":"dc:type","label":"Dc Type","values":["PhD Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["C-1 ΜΟΝΤΕΛΛΟ","Αντισιδηρομαγνητισμός","ΕΚΦΥΛΙΣΜΕΝΟΙ ΗΜΙΑΓΩΓΟΙ","Μαγνητικοί ημιαγωγοί","Μαγνητοαντίσταση","ΠΥΡΡΟΤΙΝΗΣ","ΣΟΥΛΦΙΔΙΑ ΤΟΥ ΣΙΔΗΡΟΥ","ΣΥΜΠΥΚΝΩΜΕΝΗ ΥΛΗ: ΜΑΓΝΗΤΙΚΟΣ ΣΥΝΤΟΝΙΣΜΟΣ","ΦΥΣΙΚΗ ΤΩΝ ΗΜΙΑΓΩΓΩΝ","Antiferromagnetism","C-1 MODEL","CONDENSED MATTER: MAGNETIC RESONANCE","FE7S8","HEAVILY DOPPED SEMICONDUCTORS","IRON SULFIDES","MAGNETIC SEMICONDUCTORS","Magnetoresistance","PYRRHOTITE","SEMI-CONDUCTOR PHYSICS","Φυσικές Επιστήμες","Φυσική","Natural Sciences","Physical Sciences"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["gre"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/1172","http://hdl.handle.net/10442/hedi/1172"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["THIS IS A STUDY OF THE MAGNETORESISTANCE IN ANTIFERROMAGNETIC SEMICONDUCTORS AND SPECIALLY IN PYRRHOTITE FE7S8 CUT FROM NATURAL SINGLE CRYSTALS (WITH ORIENTATIONS B C AND B// FROM 88 TO 607K. BEYOND THE NEEL POINT TN 600K AND FOR MAGNETIC FIELDS B FROM 0 TO 7 KG. A MAGNETORESISTANCE OF THE ORDER OF 10-3 WHICH IS ALWAYS NEGATIVE FOR SMALL B AND CHANGES SIGN FOR HIGHER MAGNETIC FIELDS WAS OBSERVED. AFTER THIS SIGN REVERSAL AND FOR INTERMEDIATE TEMPERATURES IN THE RANGE FROM 160 TO 400K APPROXIMATELY THE MAGNETORESISTANCE INCREASES MONOTONICALLY WITHB. ALTHOUGH FOR TEMPERATURES OUTSIDE THIS RANGE, ΔΡ/Ρ(O) EXHIBITS AN OSCILLATORY BEHAVIOUR.","ΜΕΛΕΤΗ ΤΗΣ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗΣ ΣΕ ΑΝΤΙΣΙΔΗΡΟΜΑΓΝΗΤΙΚΟΥΣ ΗΜΙΑΓΩΓΟΥΣ ΚΑΙ ΕΙΔΙΚΑ ΣΕ ΔΕΙΓΜΑΤΑ ΠΥΡΡΟΤΙΝΗ (FE7S8) ΜΕ ΠΡΟΣΑΝΑΤΟΛΙΣΜΟΥΣ Β//Ψ ΚΑΙ Β C, ΚΟΜΜΕΝΑ ΑΠΟ ΦΥΣΙΚΟΥΣ ΜΟΝΟΚΡΥΣΤΑΛΛΟΥΣ, ΓΙΑ ΘΕΡΜΟΚΡΑΣΙΕΣ ΑΠΟ 88 ΜΕΧΡΙ 607Κ, ΠΕΡΑΝ ΤΟΥ ΣΗΜΕΙΟΥ NEEL (TN 600K) ΤΟΥ ΥΛΙΚΟΥ ΑΥΤΟΥ ΚΑΙ ΓΙΑ ΜΑΓΝΗΤΙΚΑ ΠΕΔΙΑ ΑΠΟ 0 ΜΕΧΡΙ 7 ΚG. ΑΠΟ ΤΙΣ ΜΕΤΡΗΣΕΙΣ ΠΡΟΕΚΥΨΕ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗ, ΤΗΣ ΟΠΟΙΑΣ ΟΙ ΜΕΓΙΣΤΕΣ ΤΙΜΕΣ ΕΙΝΑΙ ΤΗΣ ΤΑΞΗΣΜΕΓΕΘΟΥΣ 10-3 ΚΑΙ Η ΟΠΟΙΑ ΕΙΝΑΙ ΑΡΝΗΤΙΚΗ ΓΙΑ ΑΣΘΕΝΗ ΜΑΓΝΗΤΙΚΑ ΠΕΔΙΑ, ΕΝΩ ΑΛΛΑΖΕΙ ΠΡΟΣΗΜΟ ΓΙΑ ΜΕΓΑΛΥΤΕΡΕΣ ΤΙΜΕΣ ΜΑΓΝΗΤΙΚΟΥ ΠΕΔΙΟΥ. ΓΙΑ ΠΕΡΑΙΤΕΡΩ ΑΥΞΗΣΗ ΤΟΥ Β ΚΑΙ ΓΙΑ ΕΝΔΙΑΜΕΣΕΣ ΘΕΡΜΟΚΡΑΣΙΕΣ ΑΠΟ 160 ΜΕΧΡΙ 400Κ ΠΕΡΙΠΟΥ, Η ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗ ΕΜΦΑΝΙΖΕΙ ΣΥΝΕΧΗ ΑΥΞΗΣΗ, ΕΝΩ ΓΙΑ ΘΕΡΜΟΚΡΑΣΙΕΣ ΕΞΩ ΑΠΟ ΤΗΝ ΠΑΡΑ ΠΑΝΩ ΠΕΡΙΟΧΗ, ΟΙΚΑΜΠΥΛΕΣ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗΣ ΕΜΦΑΝΙΖΟΥΝ ΤΑΛΑΝΤΟΥΜΕΝΗ ΜΟΡΦΗ."]},{"key":"dc:title","label":"Title","values":["ΜΕΛΕΤΗ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗΣ ΣΕ ΜΟΝΟΚΡΥΣΤΑΛΛΟΥΣ FE7S8","MAGNETORESISTANE OF FE7S8 SINGLE CRYSTALS"]}]}],"canonical_facts":{"dc:creator":["Βιτωράτος, Ευάγγελος"],"dc:date":["1989"],"dc:description":["THIS IS A STUDY OF THE MAGNETORESISTANCE IN ANTIFERROMAGNETIC SEMICONDUCTORS AND SPECIALLY IN PYRRHOTITE FE7S8 CUT FROM NATURAL SINGLE CRYSTALS (WITH ORIENTATIONS B C AND B// FROM 88 TO 607K. BEYOND THE NEEL POINT TN 600K AND FOR MAGNETIC FIELDS B FROM 0 TO 7 KG. A MAGNETORESISTANCE OF THE ORDER OF 10-3 WHICH IS ALWAYS NEGATIVE FOR SMALL B AND CHANGES SIGN FOR HIGHER MAGNETIC FIELDS WAS OBSERVED. AFTER THIS SIGN REVERSAL AND FOR INTERMEDIATE TEMPERATURES IN THE RANGE FROM 160 TO 400K APPROXIMATELY THE MAGNETORESISTANCE INCREASES MONOTONICALLY WITHB. ALTHOUGH FOR TEMPERATURES OUTSIDE THIS RANGE, ΔΡ/Ρ(O) EXHIBITS AN OSCILLATORY BEHAVIOUR.","ΜΕΛΕΤΗ ΤΗΣ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗΣ ΣΕ ΑΝΤΙΣΙΔΗΡΟΜΑΓΝΗΤΙΚΟΥΣ ΗΜΙΑΓΩΓΟΥΣ ΚΑΙ ΕΙΔΙΚΑ ΣΕ ΔΕΙΓΜΑΤΑ ΠΥΡΡΟΤΙΝΗ (FE7S8) ΜΕ ΠΡΟΣΑΝΑΤΟΛΙΣΜΟΥΣ Β//Ψ ΚΑΙ Β C, ΚΟΜΜΕΝΑ ΑΠΟ ΦΥΣΙΚΟΥΣ ΜΟΝΟΚΡΥΣΤΑΛΛΟΥΣ, ΓΙΑ ΘΕΡΜΟΚΡΑΣΙΕΣ ΑΠΟ 88 ΜΕΧΡΙ 607Κ, ΠΕΡΑΝ ΤΟΥ ΣΗΜΕΙΟΥ NEEL (TN 600K) ΤΟΥ ΥΛΙΚΟΥ ΑΥΤΟΥ ΚΑΙ ΓΙΑ ΜΑΓΝΗΤΙΚΑ ΠΕΔΙΑ ΑΠΟ 0 ΜΕΧΡΙ 7 ΚG. ΑΠΟ ΤΙΣ ΜΕΤΡΗΣΕΙΣ ΠΡΟΕΚΥΨΕ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗ, ΤΗΣ ΟΠΟΙΑΣ ΟΙ ΜΕΓΙΣΤΕΣ ΤΙΜΕΣ ΕΙΝΑΙ ΤΗΣ ΤΑΞΗΣΜΕΓΕΘΟΥΣ 10-3 ΚΑΙ Η ΟΠΟΙΑ ΕΙΝΑΙ ΑΡΝΗΤΙΚΗ ΓΙΑ ΑΣΘΕΝΗ ΜΑΓΝΗΤΙΚΑ ΠΕΔΙΑ, ΕΝΩ ΑΛΛΑΖΕΙ ΠΡΟΣΗΜΟ ΓΙΑ ΜΕΓΑΛΥΤΕΡΕΣ ΤΙΜΕΣ ΜΑΓΝΗΤΙΚΟΥ ΠΕΔΙΟΥ. ΓΙΑ ΠΕΡΑΙΤΕΡΩ ΑΥΞΗΣΗ ΤΟΥ Β ΚΑΙ ΓΙΑ ΕΝΔΙΑΜΕΣΕΣ ΘΕΡΜΟΚΡΑΣΙΕΣ ΑΠΟ 160 ΜΕΧΡΙ 400Κ ΠΕΡΙΠΟΥ, Η ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗ ΕΜΦΑΝΙΖΕΙ ΣΥΝΕΧΗ ΑΥΞΗΣΗ, ΕΝΩ ΓΙΑ ΘΕΡΜΟΚΡΑΣΙΕΣ ΕΞΩ ΑΠΟ ΤΗΝ ΠΑΡΑ ΠΑΝΩ ΠΕΡΙΟΧΗ, ΟΙΚΑΜΠΥΛΕΣ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗΣ ΕΜΦΑΝΙΖΟΥΝ ΤΑΛΑΝΤΟΥΜΕΝΗ ΜΟΡΦΗ."],"dc:identifier":["10.12681/eadd/1172","http://hdl.handle.net/10442/hedi/1172"],"dc:language":["gre"],"dc:publisher":["University of Patras","Πανεπιστήμιο Πατρών"],"dc:subject":["C-1 ΜΟΝΤΕΛΛΟ","Αντισιδηρομαγνητισμός","ΕΚΦΥΛΙΣΜΕΝΟΙ ΗΜΙΑΓΩΓΟΙ","Μαγνητικοί ημιαγωγοί","Μαγνητοαντίσταση","ΠΥΡΡΟΤΙΝΗΣ","ΣΟΥΛΦΙΔΙΑ ΤΟΥ ΣΙΔΗΡΟΥ","ΣΥΜΠΥΚΝΩΜΕΝΗ ΥΛΗ: ΜΑΓΝΗΤΙΚΟΣ ΣΥΝΤΟΝΙΣΜΟΣ","ΦΥΣΙΚΗ ΤΩΝ ΗΜΙΑΓΩΓΩΝ","Antiferromagnetism","C-1 MODEL","CONDENSED MATTER: MAGNETIC RESONANCE","FE7S8","HEAVILY DOPPED SEMICONDUCTORS","IRON SULFIDES","MAGNETIC SEMICONDUCTORS","Magnetoresistance","PYRRHOTITE","SEMI-CONDUCTOR PHYSICS","Φυσικές Επιστήμες","Φυσική","Natural Sciences","Physical Sciences"],"dc:title":["ΜΕΛΕΤΗ ΜΑΓΝΗΤΟΑΝΤΙΣΤΑΣΗΣ ΣΕ ΜΟΝΟΚΡΥΣΤΑΛΛΟΥΣ FE7S8","MAGNETORESISTANE OF FE7S8 SINGLE CRYSTALS"],"dc:type":["PhD Thesis"]},"updated_at":"2026-07-24T02:24:46Z"}