Laravel 5 belongsTo(classname::class) doesn't works

Due to a Model Name change, my class Student doesn't works properly now. With a database called assos:

`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` text COLLATE utf8mb4_unicode_ci NOT NULL,
`student_id` text COLLATE utf8mb4_unicode_ci NOT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,

linked with a model Asso,

The query App\Asso::first()->belongsTo(Student::class) returns null

When the query App\Asso::first()->belongsTo('App\Student','student_id') returns the associated student.

I don't understand why belongsTo(Student::class) doesn't work properly. Can you help me to figure it out?

Thanks a lot

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